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INBAR Working Paper No. 85
Juan Carlos Camargo García Trinh Thang Long
Assessment of Ecosystem Services from Bamboo-dominated Natural Forests in the Coffee Region, Colombia
International Bamboo and Rattan Organisation The International Bamboo and Rattan Organisation, INBAR, is an intergovernmental organisation dedicated
to the promotion of bamboo and rattan for sustainable development.
About this report This research was carried out by INBAR as part of the CGIAR Research Program on Forests, Trees and
Agroforestry (FTA). FTA is the world’s largest research for development program to enhance the role of
forests, trees and agroforestry in sustainable development and food security and to address climate change.
CIFOR leads FTA in partnership with Bioversity International, CATIE, CIRAD, INBAR, ICRAF and TBI. FTA’s work is supported by the CGIAR Trust Fund: cgiar.org/funders/
Copyright and Fair Use: This publication is licensed for use under Creative Commons
Attribution-Non-commercial-Share Alike 3.0 Unported Licence (CC BY-NC-SA 3.0).
To view this licence visit: http://creativecommons.org/licences/by-nc-sa/3.0/
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restrict others from doing anything the licence permits. International Bamboo and Rattan Organisation PO Box 100102-86, Beijing 100102, China
Tel: +86-10-6470 6161; Fax: +86-10-6470 2166; Email: [email protected]
©2020 International Bamboo and Rattan Organisation (INBAR) www.inbar.int
Acknowledgements
We want to thank the stakeholders who provided information throughout the interviews, as well
as the Universidad Tecnológica de Pereira (UTP) and the research group on Gestión de
agroecosistemas tropicales andinos (GATA) for sharing information from unpublished project
reports—first, the project "Innovación Tecnológica para la optimización de procesos y
estandarización de productos en empresas rurales con base en la guadua” (Code 1110452-
21121; Contract 442-1-2008), funded by Colciencias, Yarima Guadua EU and Universidad
Tecnológica de Pereira), and second, the project “Servicios ecosistémicos, adaptación al cambio
climático y planificación del territorio: estrategias para el manejo de sistemas socio-ecológicos en
la zona cafetera de Colombia” (Code 111074558624, Contract No. 048-2017), financed by
Colciencias, the Asociacion de productores de café de alta calidad de la Cuchilla de San Juan
and Universidad Tecnológica de Pereira Data from these projects permitted the adaptation of the
indicators used for assessing ecosystem services in this work.
Thanks to Liliana Bueno, Juliana Muñoz and Tatiana Carmona for their contributions to
conducting interviews and the literature review.
.
Authors
Table of Contents List of Figures ........................................................................................................................... i
List of Tables .............................................................................................................................ii
List of Abbreviations ...............................................................................................................iii
Executive Summary ..................................................................................................................v
1. Introduction ........................................................................................................................1
2. Methods ..............................................................................................................................3
3. Results ................................................................................................................................7
4. Discussion ........................................................................................................................16
5. Conclusions .....................................................................................................................18
5. Recommendations ...........................................................................................................19
6. References .......................................................................................................................20
Appendix .................................................................................................................................28
i
List of Figures Figure 1. Contribution of variables (rescaled) to the definition of ES among different land uses
------------------------------------------------------------------------------------------------------------------------------ 12
Figure 2. PCs and variables representing ES. Land uses are also integrated. Values in
parentheses explain the variability. ------------------------------------------------------------------------------- 13
Figure 3. Dendrogram after cluster analysis using the Ward method and Euclidian distance.
Clusters (1 = blue lines, 2 = red lines) represent groups of land uses associated with ESs. ----- 14
Figure 4. Representation of the perception of ESs by rural and urban inhabitants of the coffee
region of Colombia. --------------------------------------------------------------------------------------------------- 15
ii
List of Tables
Table 1. Values of variables associated with the assessed ESs. Case of study 1. Yarima farm.
Pereira, Colombia. ......................................................................................................................9
Table 2. Values of variables associated with the assessed ES. Case of study 2. Coffee farms,
Belen de Umbria, Colombia ......................................................................................................10
Table 3. Values of variables associated with the assessed ES. Case of study 3. Lucerna farm,
Bugalagrande, Colombia and bamboo stands along Cauca river valley ....................................11 Table 4. List of ESs assessed and the respective indicators according to availability of common
data among the three cases of study………………………………………………………………….28 Table 5. List of ESs assessed and the respective indicators according to availability of common
data among the three cases of study ........................................................................................31
iii
List of Abbreviations
AGC
BD
Bio
BGC
Co
CoP
CoPT
CP
ES
Fo
GATA
GMD
INBAR
masl
MEA
OM
OM 25 cm
OM 50 cm
PC
PCA
PHDT
Aboveground carbon
Soil bulk density
Biodiversity index
Belowground carbon
Coffee in full sun exposure
Coffee associated with plantain
Coffee associated with plantain and trees
Citric plantation
Ecosystem services
Natural forest
Grupo de investigación en gestion de agroecosistemas tropicales andinos
Geometric mean diameter of soil aggregates
International Bamboo and Rattan Organisation
Metres above sea level
Millennium Ecosystem Assessment
Soil organic matter
Soil organic matter at 25 cm depth
Soil organic matter at 50 cm depth
Principal component
Principal components analysis
Pasture with high density of trees
PLDT
PP
PWT
SD
SE
SF
SOC
Pasture with low density of trees
Pineapple plantation
Pastures without trees
Standard deviation
Degree of physical soil degradation
Soil fertility
Soil organic carbon
iv
SSI
SSPPAI
TEEB
TM
TP
UTP
WMD
Structural stability soil index Intensive silvopastoral systems with Leucaena leucocephala
The Economics of Ecosystem and Biodiversity
Total soil mesopores
Total soil porosity
Universidad Tecnológica de Pereira
Weighted mean diameter of soil aggregates
v
Executive Summary In the coffee region of Colombia, natural forest (Fo) dominated by the bamboo species Guadua
angustifolia represents remnants of natural habitat and provides key ecosystem services (ESs).
However, these forests are highly fragmented due to agricultural and urban expansion and threats
to the benefits provided by them. In order to elucidate the importance of ESs and how they might
be affected by different land uses and management, in this work, data from three cases of study
and the perceptions of rural and urban stakeholders are assessed. The results show that natural
ecosystems (including bamboo) and highly diversified land uses (e.g. agroforestry) are important
for the provision of habitat for biodiversity, soil protection and climate regulation. As the intensity
of labour and human activities increases for conducting agricultural undertakings, other ESs, such
as the supply of raw material, feed foods or soil fertility (SF) may become more relevant. The
perceptions of stakeholders on ESs change according to their location. For rural inhabitants,
priority ESs relate to provisions where local benefits are more evident, whereas for urban people,
global ESs like climate regulation and cleaner air have more relevance. Thus, assessment of ESs
should be carried out according to the socio-economic context and considering that the assigned
value of a determined ES might change depending on the perception of who receives the benefits.
Although it is feasible that ESs can be simultaneously perceived according to different land uses,
an integrated assessment may result in more adequate information. In this context, bamboo
forests have been assessed as an excellent alternative among land uses, always providing those
ESs for which other land uses have a reduced capacity (e.g. regulation ESs), and they have the
potential of supplying goods for improving livelihoods in rural areas, as well as contributing to a
better environment in urban areas.
1
1. Introduction
The coffee region of Colombia is located along the Andean mountains at 900–2000 metres above
sea level (masl). Landscape in this area is shaped by a complex mix of land uses, mainly involving
a transformation from natural ecosystems to pastures or coffee plantations, and consequently,
becoming highly fragmented forests (Camargo and Cardona, 2005, p. 14). In this altitudinal gradient, fragmented forests are dominated by the bamboo species Guadua angustifolia (guadua;
Camargo, 2006, p. 13).
Although guadua forests represent one of the principal natural ecosystems in this region of
Colombia, there is no information on inventories that have recently been carried out. In 2006,
Kleinn and Morales-Hidalgo (2006, p. 366) estimated that the forests cover 2800 ha; however, the
pressure due to expansion of agricultural cropland and urban areas (Aguirre, 2017, pp. 34-35;
Muñoz, 2017, p. 13) and the increasing of land value when rural land comes under sub-urban use
(Giraldo et al, 2015, p. 215) are reasons to believe that the guadua forest area has decreased.
This tendency is opposite to that of other countries, where bamboo areas are increasing (e.g.
Buckingham et al, 2014, p. 770); apparently, Colombia is going against the trend.
In Colombia, and especially in the coffee region, raw material from guadua forests has been
obtained for different uses over the years (García and Camargo, 2010, p. 65, 75), most of which
relate to structural applications (Takeuchi et al, 2009, p. 43-44; Correal and Arbelaez, 2010,
p.105). Raw material is considered as a ‘provisioning’ ES,1 which is indeed acknowledged by the
beneficiaries (Muñoz-López, Camargo and Romero-Ladino, 2017, p. 230). Furthermore, other
benefits have been registered, especially those associated with the ES related to habitat for plant
biodiversity (e.g. Ospina, 2002, pp. 23–25; Ramírez-Díaz and Camargo, 2019, pp. 3–4), habitat
for birds (Sanchez and Camargo, 2012, pp. 86–87), soil conservation and protection (Camargo
et al, 2010, p. 59), water purification (Chará et al, 2010, p. 66), landscape restoration (Camargo
et al, 2018, p. 56), climate change regulation throughout carbon sequestration (Camargo,
Rodríguez and Arango, 2010, p. 93) and bioenergy (Daza Montaño et al, 2013, p. 142). In addition,
1 Ecosystem services are divided by the Millennium Ecosystem Assessment into four groups: regulatory, supporting, provisioning and cultural ecosystem services.
2
ESs of guadua forests have been assessed through an integrated approach that simultaneously
looks at both the ecological functions and economic benefits (Muñoz-López, 2017, p. 6). Likewise,
considering the equivalent energy employed in different processes when harvesting, the
sustainability of guadua forests has been evaluated under the emergy approach (Arango,
Camargo and Castaño, 2017, p. 536).
In order to present a case study of ESs provided by bamboo in the coffee region of Colombia and
make comparisons with other land uses, in this work, a literature review focussing on local studies
on ES was conducted. Then, by using existing data related to ES and different land uses, as well
as the perception of urban and rural stakeholders, an assessment of the ES was carried out.
3
1. Methods
1.1 Literature review From the available electronic resources, such as Science Direct, Scopus, Elsevier and Web of
Science, a search of information related to ESs, with a focus on studies carried out in the coffee
region of Colombia, was conducted. In addition, the repositories of local universities were
reviewed to find theses or academic documents conducted on topics related to ESs. The search
included studies with different aims but related to factors or functions that might be associated
with ES.
Studies were grouped according to the classification suggested in the framework document
created by the Center for International Forestry Research and International Bamboo and Rattan
Organisation (INBAR) (Paudyal et al, 2019, pp. 7–10) into provisioning, regulating, cultural and
habitat services based on The Economics of Ecosystem and Biodiversity (TEEB, 2010, p. 34). In
addition, a category of integrated approach was included when the focus of the work was a set of
ESs or it was carried out from different perspectives (e.g. ecological and economic).
1.2 Data collection and sites of study ES was assessed using two approaches. For the first, a quantitative approach was applied using
variables that were previously collected in prior projects. The second involved a qualitative
approach and was carried out with information gathered throughout interviews applied to rural
and urban stakeholders.
Three datasets from different projects were used for obtaining the variables used in the
quantitative approach to assess ESs. Information on the three cases comes from the coffee region
of Colombia and states of Risaralda and Valle del Cauca, which exhibit different ecological
conditions, land uses and socioeconomic contexts.
The first case was carried out in Yarima farm, in Pereira, Risaralda at 1150 masl with an annual
rainfall of 2262 mm per year on average and mean temperature of 24°C. From the total area of
4
80 ha, 20 ha are occupied by guadua forests (bamboo), and the remaining area is used for pasture
with a high density of trees (PHDT) and pasture with a low density of trees (PLDT), citric
plantations (CPs) and pineapple plantations (PPs). The density of trees per hectare for was
100/ha, and that for PLDTs was 30/ha. The data used came from the project carried out by UTP
through GATA (UTP-GATA, 2012).
For the second case, data from two sources were used. The first dataset came from 15 coffee
farms located in the municipality of Belén de Umbría, Risaralda. These farms belong to a famers
association and are distributed along the altitudinal gradient from 1012 to 1944 masl. The average
rainfall is 2217 mm/year, and the temperature is 23°C on average. The land uses included
correspond to coffee in full sun exposure (Co), coffee associated with plantain (CoP), coffee
associated with plantain and trees (CoPT) and Fo. The data were collected in the UTP-GATA
(2016) project framework. The second dataset is from the guadua forests (bamboo). Plots for
collecting data were established by Camargo (2006, pp. 69, 199, 200) in places located also in
the same municipality (Belen de Umbria) and with the same ecological conditions as the above
mentioned coffee farms. Although these data were collected a long time ago, the bamboo forest
continues to have the same conditions in terms of area, structure, management and ecological
factors. Thus, attributes used for comparisons with other land uses may be employed, always
keeping in mind that the times when data on land uses were collected are different.
In the third case, data came from two projects. Data on silvopastoral systems, pastures and Fo
came from Bueno López (2014, pp. 47–50), while those on guadua forests (bamboo) came from
Camargo (2006, pp. 69, 199, 200). The land uses included were intensive silvopastoral systems with Leucaena leucocephala (SSPPAI), pastures without trees (PWTs), Fo and guadua (bamboo).
Fo, SSPPAI and PWT were found in Lucerna farm, at 950 masl and with an average rainfall of
1100 mm and average temperature of 24°C. Information of guadua corresponds to places located
in the same ecological conditions along the Cauca River Valley. As mentioned above, guadua
forests have not changed in recent years.
The information on ES to be assessed was chosen by considering common or coincident
variables among the three cases of study. Thus, variables from soil and biomass associated with
the ESs of regulation and provisioning of habitat were selected for comparisons among land uses
5
in each case and for a multivariate analysis, including information of the three cases together.
Table 2 presents the ESs and variables associated with them. Soil variables were evaluated by
land use and coverages up to 50 cm in depth. Chemical and physical analyses were conducted
at a soil analysis lab. Values of biomass carbon for bamboo were calculated with information on
culm volume, culm density and a biomass expansion factor obtained from carbon data in Arango's
(2011, p. 40) study.
In case 1, soil organic carbon (SOC) represents the values of carbon for PPs because the
biomass does not have woody components, it is not a permanent crop and it is harvested and
renovated every 18 months. In addition, it is considered a crop with an important level of
greenhouse gas emissions (Graefe, Tapasco and Gonzalez, 2013, p. 8). For CPs, considering
the density of trees per hectare and average diameter, the allometric model proposed by Segura
and Andrade (2008, p. 8) was used. For pastures with trees, a pasture biomass value was
assigned according to Arias et al (2009, pp. 35–37), and for trees, considering the diameter and
total density of trees per hectare, the model proposed by Segura and Andrade (2008, p. 8) was
used for estimating biomass.
In case 2, values for carbon in different coffee farms came from UTP-GATA (2016). In case 3,
information on carbon in silvopastoral systems and pastures came from Arias et al (2009, pp. 35–
37). Carbon storing in Fo in cases 2 and 3 was assigned according to the values registered by
Gibbs et al (2007, p. 5) for tropical forest, considering the more conservative values.
For the qualitative approach, individual interviews were conducted with two groups of
stakeholders. A total of 10 ESs, including all categories of classification (Paudyal et al, 2019, pp.
7–10), were prioritised. Then, according to the context, the ES perception of rural and urban
inhabitants was assessed. Rural stakeholders were farmers from the coffee region who had
previously participated in the above-mentioned projects, and after being contacted, agreed to
attend the interview. Urban stakeholders were persons who usually visited the botanical garden
of UTP who agreed to be interviewed.
For rural stakeholders, the provisioning ESs assessed were wood, firewood, feed and food. The
regulation ESs were temperature regulation, soil protection and water regulation. The habitat
6
provisioning ES was biodiversity, and the cultural ESs were scenic beauty and recreation. For
urban stakeholders, the provisioning ESs assessed were wood and feeding. The regulation ESs
were temperature regulation, soil protection, air quality, climate regulation and water regulation.
The habitat provisioning ESs were biodiversity and connectivity of forests for conservation, and
finally, the cultural ES was scenic beauty.
1.3 Analyses For the quantitative approach, descriptive statistics of all variables were calculated within the land
uses of each case of study. Then, a non-parametric Kruskal–Wallis test was performed in order to see significant (p < 0.05) changes between land uses. The original values of variables that
represent ESs were rescaled to a range of 0.1–1 using the transformation proposed by Kearney
et al (2017, p. 169) and suggested by De Leijster et al (2019, p. 5):
𝑌𝑌𝑖𝑖 = 0.1 + �𝑋𝑋𝑖𝑖 −𝑀𝑀𝑀𝑀𝑀𝑀𝑖𝑖
𝑀𝑀𝑀𝑀𝑀𝑀𝑖𝑖 − 𝑀𝑀𝑀𝑀𝑀𝑀𝑖𝑖� 𝑀𝑀 0.9,
where i is the ES indicator index, Y is the response index value of i and Max and Min represent
the maximum and minimum of i. For soil bulk density (BD), the reverse transformation was applied
because high values of bulk density are related to limiting conditions of soil. Thus, Y is subtracted
from 1.1, as proposed by Kearney et al (2017, p. 169) and recommended by De Leijster et al
(2019, p. 5). The values of ES were averaged and then plotted to show the contribution of each
land use or coverage.
With the original values of ES indicators, a principal components analysis (PCA) was performed
to show those with higher influence on data variability. The first two components were then plotted
to see the variables with higher correlations with them. Thereafter, to define probable levels of
association between land uses or coverages concerning the capacity to provide ESs, a cluster
analysis was performed. All analyses were carried out with InfoStat/Free 2019d (Di Rienzo et al,
2019).
For the qualitative approach, data collected in interviews for rural and urban stakeholders were
averaged by land use and plotted in radar figures in order to elucidate those ESs that represent
a high perceived importance.
7
2. Results
2.1 Literature review Local studies on ESs were not abundant. Most of the references found focussed on those land
uses representing changes towards a better condition (e.g. monocrop to agroforestry) or natural
ecosystems (e.g. guadua or forest). Within these studies were included some carried out for urban
habitats, where guadua forests played an important role.
Twenty-four studies were found, eight of them related to regulating services where climate
regulation represented the topic of higher interest. Most of the studies were related to guadua
forests and only one (Daza Montaño et al, 2013, p. 22) included other bamboo species. Only two
studies were written in English and the others in Spanish, which might be a restriction for being
referred to at the global level.
An integrated approach was used in eight studies, where the focus was a set of ESs and not a
specific ES. In addition, these studies integrated ecological, economic and sociocultural factors
(e.g. Muñoz-López, 2017, p. 6) for the assessment of ESs. Thus, the perception of the benefits
received from a specific land use might be acknowledged more easily by stakeholders. Methods
applied in these cases are usually qualitative because require rescale variables for being
compared (e.g. Muñoz-López, 2017, p. 21) or valuated with an integrated indicator (e.g. Dossman,
2009, pp. 35–36).
Due to the distribution of guadua forests, surrounding urban areas or even within them, studies
have included these ecosystems. In fact, these bamboo forests are associated with ecological
quality or the possibility of obtaining raw material for different uses (García Sierra and Giraldo
Gómez, 2018, p. 110). Unfortunately, urban expansion has been seen to have a negative effect
on guadua forests (Aguirre, 2017, pp. 34– 35; Muñoz, 2017, p. 13), and therefore, the associated
ES might also be lost.
8
The studies listed below were carried out with academic purposes (Table 5, Appendix). Therefore,
the possibility of being included as an input for standards (local or international) will depend on
the information requirements of each standard and its quality when the studies were carried out.
2.2 The quantitative approach In all cases, a better state of ESs was associated with land uses with more complexity in structure,
such as bamboo forest or Fo. However, more restricted conditions for ESs were related to land
uses with a simple structure and composition, such as PPs or PWTs (Table 1, Table 2, Table 3).
According to the indicators considered to assess ESs, natural and bamboo forests were mainly
important for ESs of climate regulation and habitat for biodiversity. In cases 1 and 2, values of
indicators for both ESs were significantly higher (p < 0.05) than those of other land uses (Table 1
and Table 2). In case 3, although the total ecosystem carbon (below-ground carbon and above-
ground carbon) showed values less than those of SSPIA and PWT, the above-ground carbon represented by biomass was significantly higher (p < 0.05) for bamboo and forest (Table 3).
For indicators associated with the ESs of soil protection and water regulation, natural and bamboo
forests showed similarities with land uses that include woody species as a component (e.g.
agroforestry systems). BD was always lower in bamboo (Table 1, Table 2, Table 3), showing
proper conditions of aeration and water flow.
In case 3, where clayey soils are predominant, high values for indicators of structural stability
(weighted mean diameter of soil aggregates [WMD] and geometric mean diameter of soil
aggregates [GMD]) do not necessarily represent better soil conditions. Big soil aggregates do not
provide the proper conditions, whereas middle size soil aggregates found in soils under bamboo
are better for maintaining soil stability (Table 3).
In cases 1 and 3, SF was lower in bamboo, but values were moderate even though fertiliser is
never supplied under this land use. In fact, the values of SF in case 1 were not significantly
different (p > 0.05). In case 2, SF was higher as the complexity of land use and vegetal
composition increased. For cases 1 and 2, soil organic matter (OM) values were always higher
9
for bamboo, while in case 3, the value was slightly lower in bamboo (Table 1, Table 2, Table 3).
Thus, the results show that the ESs of nutrient cycling were also important under bamboo.
Table 1: Values of variables associated with the assessed ESs. Case of study 1. Yarima farm.
Pereira, Colombia.
ES Indicator Bamboo CP PHDT PLDT PP
Mean SD Mean SD Mean SD Mean SD Mean SD
Nutrient cycling
OM 25 cm 7.9 1.5 5.3 2.4 5.3 0.4 4.3 0.6 4.1 0.6
OM 50 cm 6.1 1.7 3.2 1.3 2.4 0.3 2.4 0.4 2.7 0.4
SF 5.5 0.2 6.2 0.9 6.1 0.4 5.6 0.2 6.1 0.9
Soil Protection
WMD (mm) 2.6 0.2 2.7 0.5 3.1 0.7 2.9 0.3 3.1 0.8
GMD (mm) 1.4 0.1 1.5 0.3 1.8 0.5 1.7 0.2 1.9 0.6
SSI mean 1.6 1.0 157.6 139.9 307.8 45.9 287.4 118.1 464.1 279.7
SSI high 1.8 1.1 304.6 332.4 671.1 245.8 407.2 152.8 1215.5 904.8
SSI low 27.6 12.1 1202.2 518.7 2171.2 1091.9 2176.7 1081.9 2690.1 2441.1
SE 11.2 2.4 8.0 4.5 6.8 0.5 5.5 0.6 5.4 0.7
Water regulation
TP (%) 64.2 3.8 56.6 6.2 49.3 0.3 51.4 2.3 58.2 2.9
TM (%) 11.2 0.8 11.4 1.6 14.6 1.7 13.7 2.6 10.3 1.8
BD (g/ m3) 0.8 0.1 1.0 0.2 1.2 0.01 1.1 0.1 1.0 0.1
Climate regulation
BGC (Mg/ha)
167.3 21.2 115.0 33.7 131.7 7.1 110.0 11.1 93.5 7.4
AGC (Mg/ha)
26.5 9.3 9.2 0.0 28.5 0.0 11.0 0.0 0.0 0.0
AGC + BGC (Mg/ha)
193.8 22.9 124.2 33.7 160.2 7.1 121.0 11.1 93.5 7.4
Habitat provisioning
Bio 0.5 0.3 0.5 0.3 0
Bamboo = natural bamboo forest with Guadua angustifolia, SSI = Structural stability index, SE= Degree of soil physical degradation, TP = soil total porosity, TM= soil mesopores, BGC = belowground carbon, AGC=
aboveground carbon. Bio = biodiversity index, SD = standard deviation, OM 25 cm = soil organic matter at 25 cm depth, OM 50 cm = soil organic matter at 50 cm depth.
10
Table 2. Values of variables associated with the assessed ES. Case of study 2. Coffee farms, Belen de Umbria, Colombia
ES Indicator Bamboo Fo Co CoP CoPT
Mean SD Mean SD Mean SD Mean SD Mean SD
Nutrient cycling
OM 25 cm 10.4 4.0 4.2 0.6 4.5 0.6 4.3 0.9 3.3 0.8
OM 50 cm 6.8 2.8 3.9 1.1 4.3 0.8 3.7 1.1 2.8 0.7
SF 5.8 0.6 5.4 0.4 4.9 0.1 5.0 0.7 5.1 0.6
Soil Protection
WMD (mm)
3.1 0.6 3.3 1.0 2.7 0.3 3.2 0.9 3.4 0.9
GMD (mm)
2.0 0.7 2.4 0.8 2.0 0.2 2.4 0.7 2.6 0.7
SSI mean 24.7 22.6 8.8 0.3 11.3 0.3 11.0 1.2 10.8 1.9
SSI high 35.1 43.1 9.0 0.3 11.5 0.3 11.2 1.2 11.0 1.9
SSI low 112.9 65.4 560.9 80.9 800.3 157.8 755.3 208.1 827.2 276.8
SE 20.3 8.8 6.7 1.7 6.5 1.1 5.8 1.4 4.3 1.0
Water regulation
TP (%) 53.0 4.4 61.2 6.8 66.2 1.2 62.5 5.6 61.5 3.2
TM (%) 14.1 9.5 12.4 2.3 21.8 1.3 20.6 3.1 21.2 3.3
BD (g/ m3)
0.7 0.1 0.9 0.2 0.8 0.0 0.9 0.1 0.9 0.1
Climate regulation
BGC (Mg/ha)
168.0 40.3 103.7 3.8 99.7 16.7 98.5 21.7 77.9 15.6
AGC (Mg/ha)
180.9 107.2 180.0 0.0 5.5 0.6 7.6 3.5 8.5 4.6
AGC + BGC (Mg/ha)
348.9 112.1 283.7 3.8 105.1 16.1 106.1 21.9 86.4 16.9
Habitat provisioning
Bio 0.5 0.9 0.3 0.4 0.6
11
Table 3. Values of variables associated with the assessed ES. Case of study 3. Lucerna farm, Bugalagrande, Colombia and bamboo stands along Cauca river valley
ES Indicator Bamboo Fo SSPPAI PWT
Mean SD Mean SD Mean SD Mean SD
Nutrient cycling
OM 25 cm 6.7 2.8 8.6 1.4 8.8 0.7 8.2 0.9
OM 50 cm 2.4 1.0 5.0 0.6 4.5 1.9 4.2 0.4
SF 6.8 0.6 8.0 0.7 9.4 0.5 8.5 0.7
Soil Protection
WMD (mm)
3.7 0.9 5.0 0.2 4.9 0.1 4.4 0.2
GMD (mm)
2.8 1.1 3.5 0.3 3.2 0.1 2.8 0.2
SSI mean 58.6 40.7 57.7 24.2 23.6 1.3 10.7 2.0
SSI high 724.3 1101.8 105.6 59.7 27.8 2.4 12.4 2.7
SSI low 169.6 92.9 201.6 21.3 310.0 141.8 333.7 392.9
SE 8.8 3.9 8.1 1.4 8.8 1.2 11.5 0.9
Water regulation
TP (%) 44.0 5.9 50.3 3.9 47.2 4.0 40.1 2.3
TM (%) 29.0 11.3 11.8 0.8 12.0 1.0 11.9 0.1
BD (g/ m3)
1.1 0.2 1.2 0.1 1.3 0.1 1.4 0.0
Climate regulation
BGC (Mg/ha)
136.8 35.2 227.6 21.6 248.5 36.7 252.9 25.2
AGC (Mg/ha)
94.7 43.7 180.0 0.0 8.4 0.0 3.6 0.0
AGC + BGC (Mg/ha)
231.5 52.0 407.6 21.6 256.9 36.7 256.5 25.2
Habitat provisioning
Bio 0.5 0.0 0.9 0.0 0.6 0.0 0.1 0.0
When values of variables or indicators are rescaled to the ES index, the tendency is the same as
observed with original data. Under this approach, the ES expressed by a set of variables where
each one contributes to the definition of ES, with interesting results concerning the contribution of
each land use or coverage to ES. Thus, if a farm is a unit of analysis, it might be feasible to define trade-offs among land uses and coverages and ES (Figure 1).
12
a)
b)
c) Figure 1. Contribution of variables (rescaled) to the definition of ES among different land uses
The area in the pie portion represents the number of variables used for defining the ES. a) Case of study 1. Yarima farm, Pereira, Colombia. b) Coffee farms, Belén de Umbría, Colombia c) Lucerna farm,
Bugalagrande, Colombia, and bamboo stands along Cauca River Valley.
0
0.2
0.4
0.6
0.8
1OM 25 cm
OM 50 cm
SF
WMD
GMD
SSI mean
SSI high
SSI lowSE
TP
TM
BD
BGC
AGC
Bio
CP Bamboo PHDT PLDT PP
0
0.2
0.4
0.6
0.8
1OM 25 cm
OM 50 cm
SF
WMD
GMD
SSI mean
SSI high
SSI lowSE
TP
TM
BD
BGC
AGC
Bio
Co CoP CoPT Bamboo Fo
0
0.2
0.4
0.6
0.8
1OM 25 cm
OM 50 cm
SF
WMD
GMD
SSI mean
SSI high
SSI lowSE
TP
TM
BD
BGC
AGC
Bio
PWT SSPPAI Bamboo Fo
13
After the PCA, two components explained 74% of the total data variability. The first component
had a higher influence of variables, representing the ESs of nutrient cycling (OM, SF), climate
regulation (AGC, BGC) and habitat for Bio. The second component correlated well with variables
associated with the ES of water regulation (TP, TM, BD). Land uses integrated into the analysis
permit associations between the principal components (PCs), ES and land uses to be elucidated.
Figure 2 depicts the contribution of variables (length of the line) to the value of components 1 and
2. As the line becomes longer in relation to each axis, the contribution of each variable is greater.
Likewise, the land uses in Figure 2 represent the value of each component by land use.
Figure 2. PCs and variables representing ES. Land uses are also integrated. Values in parentheses
explain the variability.
The association between components, ESs and land uses was confirmed after the cluster
analysis. Land uses were grouped into two clusters (Figure 3). Thus, land uses of PPs, PHDTs,
PLDTs, CPs, Co, CoP and CoPT are included in cluster 1 (Figure 3), representing low values of
component 1 (ESs of climate regulation, nutrient cycling and habitat for bio), although Co, CoP
and CoPT positively contribute to component 2 (ES of water regulation; Figure 2). Cluster 2 (Figure
3) includes land uses of SSPPAI, PWT, bamboo and Fo, which related to high values of
14
component 1 (ESs of climate regulation, nutrient cycling and habitat for bio). In addition, bamboo
and Fo, with positive values regarding component 2, also show a proper association with the ESs
of soil protection and water regulation (Figure 2).
Figure 3. Dendrogram after cluster analysis using the Ward method and Euclidian distance. Clusters (1
= blue lines, 2 = red lines) represent groups of land uses associated with ESs.
Individually, the PP has the least desirable conditions, with the lowest values regarding
component 1 and component 2, whereas bamboo and Fo represent better capacity for providing
ESs.
2.3 The qualitative approach For rural areas, it was feasible to compare bamboo with four land uses (Figure 4a), while in urban
areas, bamboo was compared with trees (urban) and forest fragments (within the city; Figure 4b).
Compared with other land uses, in rural areas, bamboo always had a higher capacity to provide
regulation, habitat and cultural ES. Meanwhile, provision of ESs was perceived to be higher for
other land uses. Regarding Fo, bamboo was perceived as better (Figure 4a).
15
In urban areas, bamboo was also perceived as better than other land uses for regulating ES. In
addition, it was reported to be easier for ES regulation in the interviews. In this case, the people
interviewed belonged to UTP, and most had an academic profile. Bamboo in urban areas was
perceived as having almost the same capacity for providing ESs as forest (Figure 4b).
a)
b)
Figure 4. Representation of the perception of ESs by rural and urban inhabitants of the coffee region of Colombia. ESs are expressed using Likert scales of 1 to 10, where 1 represents the lowest level of ES supply and 10
represents the highest level. Results of interviews conducted with a) rural stakeholders, b) urban stakeholders.
0
2
4
6
8
10Wood
Firewood
Feed
Food
Temperature regulation
Soil Protection
Water regulation
Habitat
Scenic beauty
Recreation
Bamboo Coffee Pasture Pineapple Forest
0
2
4
6
8
10Wood
Feed
Temperatureregulation
Soil Protection
Air quality
Climate regulation
Water regulation
Habitat
Conectivity
Scenic beauty
Bamboo Trees Forest
16
3. Discussion
Local information on ES is still scarce, although the concept has been used for almost two
decades (e.g. De Groot, Wilson and Boumans, 2002, p. 394; Millennium Ecosystem Assessment
[MEA], 2005, p. V). However, information on studies with different aims might be used to assess
ESs. For example, studies in productivity might be associated with provision services, while those
related to bio usually have indexes useful for describing functions that represent regulation ES.
All land uses can provide ESs; however, this cannot always be done with the same capacity (Baral,
Guariguata and Keenan, 2016, p. 261). In this study, land uses with higher similarities with natural
ecosystems (Fo, bamboo and agroforestry) showed more important results for providing ESs of
regulation, while simple arrangement showed contributions with provision. This is consistent with
studies where ESs are compared according to the level of management intensity, diversity and
complexity of the arrangements (Cerda et al, 2017, pp. 313–316; De Leijster et al, 2019, p. 10).
However, other land uses might be perceived as much more efficient in terms of their benefits
when economic profit is considered.
Since the base of ecological functions, and therefore ESs, is supported by biophysical processes
(Kangas et al, 2018, p. 7), if restrictions naturally exist, it is feasible that the ESs will not improve
even under the better management practices or conservation strategies. Muñoz-López (2017, p.
23) found that guadua bamboo forests were located in marginal areas where the soil had some
restrictions. When bamboo shows values of ES indicators similar or lesser than other land uses,
this condition should be considered.
If natural and bamboo forest coexist with other land uses, ESs provided by them might be a trade-
off, considering the limitations associated with some of the land uses assessed. These
relationships are called synergistic by Dai et al (2017, p. 7808), and they might be useful for
promoting proper, integrated land use management. However, sometimes, trade-off occurs in
association with a negative ES condition (Rodríguez et al, 2006, p. 2,7), especially when an ES
is enhanced at the detriment of others. This was not the situation here, and with the proposed
approach, land uses with limited or deteriorated conditions may be identified and prioritised for
better management strategies.
17
Bamboo is considered a forest ecosystem. This is probably related to the abundance of guadua
forests in comparison with areas under Fo. Indeed, along the coffee region and specifically
between 900 and 2000 masl, guadua bamboo forests are abundant (Camargo, 2006, p. 13).
According to the information collected in interviews, dividing stakeholders into two groups was a
proper way to obtain better and reliable information on the perception of ESs. In rural areas
stakeholders had more possibilities of comparing ESs among different land uses. Given the
current situation, in which the market for bamboo products has some limitations (Muñoz-López,
2017, p. 26), bamboo had less importance for provisioning ESs when it was considered as a
commercial product; however, the domestic uses still have a significant role for rural people.
As in other studies, it was confirmed here that perceptions of SE from bamboo was an important
result due to the diversity and knowledge of guadua among farmers and urban people. This was
also describe by Paudyal et al 2019, pp. 11–12), as bamboo offers higher amounts of ES. In fact,
different groups of consumers have demanded raw material for different applications (García and
Camargo, 2010, p. 69,75). Currently, the possibilities of using bamboo raw material obtained even
from urban bamboo forest has increased, since an inventory of guadua bamboo forest carried out
in the city of Pereira (coffee region of Colombia) made it possible to identify a potential area to be
managed and harvested (García Sierra and Giraldo Gómez, 2018, p. 110).
Because of urban expansion (Giraldo, Osorio and Tobón, 2015, p. 245; Muñoz, 2017, p. 13),
which will probably increase the land price associated with this process, the ES perception of
bamboo forest by farmers living close to cities may be negatively biased. Therefore, the
perception of ES should always be analysed by considering the possibilities when it comes to
interpreting the answers. Usually, responses of ordinary people are less understood or depend
on the motivation of persons related to an ES (Asah et al, 2014, pp. 181, 182, 185). Hence,
information from interviews should be carefully managed and interpreted, and definitive
conclusions should be avoided.
18
5. Conclusions
Certainly, bamboo is fulfilling an important role in the provision of ES in the coffee region of
Colombia. Advantages were evidenced here under both approaches used for assessing ES.
Bamboo has an important potential to provide ESs of regulation and provisioning habitat.
According to the economic context, the domestic uses and possibilities of a market for bamboo
products, provisioning ESs will also become important. This is a real advantage regarding other
land uses, where there is not the same capacity to provide different kinds of ES.
The set of ESs assessed by the quantitative approach always tended to be better in natural and
bamboo forests. In contrast, the capacity of provisioning ESs tends to decrease as the uniformity
of land uses increases. However, in this region of Colombia, bamboo is often part of farming
systems where other land uses are present. Hence, if ES assessment is done for farming systems,
bamboo contributes by trading off those ESs of regulation and provisioning habitat, which are
weakly provided by other land uses.
The qualitative approach confirmed the importance of bamboo for providing ESs. Although the
context was different (rural and urban), its capacity was always recognised. In the coffee region
of Colombia, bamboo forests have traditionally provided raw material for different applications. In
addition, they represent the remnants of natural ecosystems along the ecological conditions of
this region.
Rescaling variables used as indicators for describing ESs was useful for comparisons on the
same scale. In addition, multivariate analyses permitted a general overview of ES. It was useful
to see the trade-off between ES and land uses. Nevertheless, the ES valuation of each land use
is relevant for avoiding negative trade-offs. This means that those land uses with a low valuation
of ES should be considered for improvements, as it certainly represents degradation problems.
19
6. Recommendations
Maximising the benefits of bamboo forests in the coffee region of Colombia requires increasing
areas that create the connectivity of the existing fragmented bamboo areas. A complementary
measure is increasing the control of those areas with high pressure on forests where bamboo is
being removed. Both challenges absolutely require the support of government institutions and the
participation of farmers.
Considering that ecological functions become ESs only when benefits are perceived,
stakeholders are the main source of information on ESs. Therefore, researchers or those who
analyse information should have the capacity to understand the meaning of the perceptions
expressed.
When the approach requires the perception of stakeholders, before gathering them, tools for
collecting information should be adjusted or addressed to the context. Different questions and
ways of collecting information might be used depending on the specific characteristics of the
population being assessed.
Studies related to the economic benefits of bamboo should be carried out. Such research can
include consideration of the domestic uses—which are frequently ignored—as a part of these
benefits.
20
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28
Appendix
Table 4. List of ESs assessed and the respective indicators according to availability of common data among the three cases of study
ES Indicator Description References
Nutrient cycling
OM 25 cm and OM 50 cm
OM of soils up to 50 cm depth, represents the possibility of nutrient cycling and carbon content.
(Malagón et al,
1995, pp. 303, 427) (Laiho et al,
2003, p. 10)
Soil fertility (SF)
SF is qualification of the nutrient availability as a result of biochemical processes. This approach assigns scores to eight chemical parameters
(pH, Al saturation, total bases, bases saturation, cation exchange capacity, soil organic carbon [SOC], K and P) between 0 cm and 25 cm depth
(F1) and then between 25 cm and 50 cm depth (F2). Scores values are computed proportionally according to the depth (F1 70% and F2 30%) and an only value of SF is obtained (e.g. >8.4 is a
very high fertility, while >3.6 is very low fertility).
(Ortega, 1995, p. 424)
Soil protection
WMD
Soil structure represents level of aggregation. A proper soil structure reduces the susceptibility of
soil to being eroded. Soil aggregates with diameters smaller than 0.5 mm increase susceptibility to erosion (e.g. WMD > 5 mm is a highly stable soil structure, while WMD < 0.5 is
an unstable soil structure).
(Cortés and Malagón, 1984,
p. 252,253) (Montenegro and Malagón, 1990,
pp. 297–306)
GMD Complementary to WMD and represents better the dominant diameter soil aggregates.
(Jaramillo, 2002, p. 110)
SSI mean
Represents the relationship between stable mean soil aggregates (0.25 mm and 2 mm) and the extreme values (> 3 mm and >0.125 mm).
Higher values represent the dominance of mean soil aggregates, and therefore, a better condition of the soil structure, since a high proportion of aggregates bigger than 2 mm in diameter might
(Jaramillo, 2002,
p. 111)
29
be associated with cemented soils; when aggregates smaller than 0.25 mm are
predominant, soil aeration decreases.
SSI high Complementary to SSI mean representing the proportion of aggregates > 3 mm regarding to
mean size soil aggregates
(Jaramillo, 2002, p. 112)
SSI low Complementary to SSI mean representing the proportion of aggregates < 0.25 mm regarding to mean size soil aggregates
(Jaramillo, 2002, p. 112)
SE
This is the relation between the OM regarding clay and silt and represents the risk of soil physical degradation. Higher values (>9) are
associated with stable soil, whereas low values (<3) are associated with degraded soils. Soil structure is affected by management when some practices damage the relining of soil peds,
provided by OM, clay and oxides of Fe and Al.
(Zilio, 2015, pp. 24–25)
Water regulation
TP
Represents the total porous space (%) of soil,
and therefore, the availability for liquids and gases. Higher values (e.g. >50%) result in proper air and water dynamics.
(Montenegro and Malagón, 1990,
pp. 278–279), (Jaramillo, 2002, p. 193),
TM Represents the proportion of soil pores where water may be stored and is available for plants. Therefore, also fulfils functions of regulation.
(Montenegro and Malagón, 1990, pp. 278–279), (Jaramillo, 2002,
p. 192)
BD
Relationship between the soil dry mass and total soil volume. Higher values (e.g. > 1.2 g/cm3)
would be associated with compacting problems, whereas low values (<0.8 g /cm3) represent proper conditions of aeration and water flow.
(Montenegro and Malagón, 1990,
p. 74), (Jaramillo, 2002, p. 160)
Climate regulation
Belowground carbon (BGC)
Carbon stored in soil, roots and rhizome (for bamboo). It represents the capacity of the ecosystems to store CO2 and contributes to
reducing global warming.
(Yiping et al, 2010, pp. 26, 27, 40)
30
(Yuen, Fung and Ziegler, 2017,
pp. 15, 24)
Aboveground carbon (AGC)
Carbon stored in plant biomass. It represents the capacity of the aerial compartments to store CO2 and contributes to reducing global warming.
(Yiping et al, 2010, pp. 26, 27,
40) (Yuen, Fung and Ziegler, 2017,
pp. 15, 24)
BGC + AGC
Total carbon of the ecosystems, represents the
capacity of the ecosystems (land use, coverage) to store CO2 and contributes to reduce global warming.
(Yuen, (Yiping et al, 2010, pp. 26,
27, 40) Fung and Ziegler, 2017, pp. 15, 24)
Habitat provisioning
Bio
This index was developed for 28 land uses more frequently found in the coffee region of Colombia. Assigned values range from 0 for short cycle
crops (annuals, grains and tubers) to 1 for mature Fo. This value depends on the composition and structure of agroecosystems and natural ecosystems assessed. The value
represents the capacity to offer habitat for biodiversity.
(Murgueitio et al, 2004, pp. 44–45)
31
Table 5. List of ESs assessed in local studies with bamboo forests and other land uses lES Description of ES Indicators of ESs (unit
of measurement) References
Provisioning services
Coffee, plantain and
meat production
Changes in coffee, plantain and meat
production according to territory transforming
Productivity, land-use change, population
growth
(Molina-Rico, Correa-Valencia and Feijoo-
Martínez, 2018, pp. 105–108)
Bioenergy Assessment of residues after harvesting of
guadua forest
Available tonnes of biomass residues
(Camargo, Arango and Angel, 2012, pp. 91–93)
Bioenergy Assessment of five bamboo species for
provision of bamboo pellets for being torrefied
Total biomass and properties to define
suitability of bamboo species for making torrified pellets
(Daza Montaño et al, 2013, pp. 45–54)
Provision of raw material Urban guadua forests of Pereira city were assessed and productivity of culms was
defined.
Maps, volume of culms available for being harvested
(García Sierra and Giraldo Gómez, 2018, pp. 39,10,113)
Provision of raw material Properties of guadua culms were assessed
according to requirements of different users
Culm properties (dendrometric and
physical-mechanical)
(García and Camargo, 2010, pp. 71–73)
Provision of raw material Zoning of Colombia
coffee region, definition of productivity levels and quality of guadua forests
Maps with zones
according to the productivity of guadua forests, quality of guadua
culms and available land for planting guadua
(Camargo et al, 2007, pp.
125–128)
Regulation services Landscape restoration Evaluation of changes in
soil properties and carbon after the
Changes in soils properties, changes in carbon stock
(Camargo et al, 2018, pp. 56–60)
32
establishment of guadua plantation
Climate regulation Evaluation of carbon stock in guadua forests and possibilities to
include these forests in the ‘reduce emissions from deforestation and forest degradation in
developing countries’, or REDD+, initiative
Carbon stored per hectare
(Arango, Amézquita and Camargo, 2012, pp. 28–30)
Climate regulation Estimation of biomass
and carbon in natural guadua forests
Carbon stored per
hectare
(Arango, 2011, p. 34)
Climate regulation Estimation of carbon sequestration and carbon
stored in a guadua plantation
Rate of carbon fixed per hectare and carbon
stored per hectare
(Camargo, Rodríguez and Arango, 2010, p. 92)
Climate regulation Estimation of carbon
sequestration in three guadua plantations
Carbon stored and the
rate of carbon fixed per hectare
(Riaño et al, 2002, p. 49)
Water regulation and soil
protection
Soil properties related
with water flow and structural stability were compared among guadua and pastures
TP, bulk density, soil
water store capacity and distribution of soil aggregates by size and stability
(Camargo et al, 2010, pp.
55–58)
Water purification and
soil protection
Nutrient retention and runoff were compared among guadua and
pastures
Concentration of nitrates and runoff volume
(Chará et al, 2010, pp. 64–65)
Nutrient cycling Nitrogen fixation by plants and soil and presence of rhizobium
nodes within intensive silvopastoral systems
% of soil and foliar nitrogen content and number of nodes
(Bueno López and Camargo Garcia, 2015, pp. 338–340)
Habitat services
33
Habitat for plant diversity
Floristic composition was assessed in guadua
forests under different level of management
Bio (Ramírez-Díaz and
Camargo, 2019, p. 4)
Habitat for birds
Birds’ biodiversity was
assessed in guadua forests under different levels of management
Bio (Sanchez and Camargo, 2012, pp. 86–87)
Habitat for plan diversity
Floristic composition was
assessed in guadua forests under different levels of management,
locations and topographic conditions
Bio (Ospina, 2002, pp. 23–32)
Integrated approaches for assessing ES
Provisioning, regulation
and cultural ES in farms
with plantain cropping
Within farms with plantain cropping systems, interactions between ESs of provision
and regulation were assessed through biomass and plantain
production, chemical SF, physical support, erosion control, biological activity of macroinvertebrates
and social representations.
Productivity of plantain and biomass were measured and associated with
provisioning ES and soil macroinvertebrates; data on physical and chemical soil properties obtained
by sampling were related to ES of regulation and data on management
practices. Time of permanence gathered from 50 farmers using ethnographic
approaches were related with social representations. Then,
descriptive statistics, correlation and canonical analyses were used to
(Molina-Rico, 2018, pp. 74–83)
34
elucidate trade-offs between ESs
Water regulation, soil
protection, carbon stock
and raw materials supply
Valuation of guadua ES, assessing soil properties, carbon stored and
economic analysis
Values of ES rescaled, then an integrated indicator was
constructed; also, financial indicators
(Muñoz-López, 2017, pp. 21, 25)
Wood, soil protection,
water regulation,
pollination, habitat for
biodiversity
Qualifying ES of guadua,
Valuation was carried out by expert consultation
Ranking and rating approach: Scores of 0–
100 when ranking and 1–9 when rating.
(Muñoz-López, Camargo
and Romero-Ladino, 2017, pp. 245–249)
Habitat for biodiversity,
water supply
Changes in natural coverages associated with provision of ESs
Mapping, geographic
information system and expert consultation; land coverage
(Giraldo, Osorio and Tobón, 2015, pp. 245–249)
Recreation, education,
soil protection, sediment
retention, water
purification, water supply
ESs of a small watershed assessed; literature review and expert consultation carried out
Indicators from the existing literature and ranking and rating approach
(Valencia et al, 2017, pp. 25–31)
Soil protection, diversity,
and ecological
restoration
ES in silvopastoral systems
Indicators of soils properties, carbon stock and connectivity
(Chará et al, 2015, pp. 335–339)
Habitat for biodiversity,
pest control, water
regulation and climate
regulation
ES in silvopastoral systems assessed throughout of identification and
monitoring of biodiversity, soil properties and tree
mensuration
Bio, soil properties, tree
biomass
(Zuluaga, Giraldo and
Chará, 2011, pp. 11–28)
ESs of soils, such as
nutrient cycling, carbon
stock, water regulation
and provision of support
to plants
Soil properties assessed among different land
uses and values rescaled for comparison
ESs scored between 1 and 5 and an integrated indicator used to define
when characteristics of soils should be kept, improve or restored
(Dossman, 2009, pp. 35–
36)
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