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SOC dynamics and soil redistribution modelling in Mediterranean agroecosystems
Erosion, and Soil and Water Evaluation Group EEAD-CSIC, Spain
Laura Quijano
JRC - Erosion Modelling Workshop, Ispra 2017
MEDITERRANEAN ENVIRONMENT
SOC dynamics and soil redistribution modelling in Mediterranean agroecosystems
MEDITERRANEAN ENVIRONMENT
SOC dynamics and soil redistribution modelling in Mediterranean agroecosystems
Prolonged dry periods followed byheavy erosive rains on steep slopes
Prolonged dry periods followed byheavy erosive rains on steep slopes
MEDITERRANEAN ENVIRONMENT
Agricultural mismanagement, deforestation, overgrazing, forestfires, and construction activities
LAND MANAGEMENT
SOC dynamics and soil redistribution modelling in Mediterranean agroecosystems
Prolonged dry periods followed byheavy erosive rains on steep slopes
MEDITERRANEAN ENVIRONMENT
Agricultural mismanagement, deforestation, overgrazing, forestfires, and construction activities
LAND MANAGEMENT
The significance of soil erosion onsoil particles distribution andassociated SOC and 137Cs
SOC dynamics and soil redistribution modelling in Mediterranean agroecosystems
Prolonged dry periods followed byheavy erosive rains on steep slopes
MEDITERRANEAN ENVIRONMENT
Agricultural mismanagement, deforestation, overgrazing, forestfires, and construction activities
LAND MANAGEMENT
Modelling to evaluate the effect of changes in land management on SOC stocks and lateral carbon fluxes
The significance of soil erosion onsoil particles distribution andassociated SOC and 137Cs
SOC dynamics and soil redistribution modelling in Mediterranean agroecosystems
CONTINENTAL MEDITERRANEAN
Mean annual T: 13 °CMean annual P: 500mm
1.6 ha cereal field
Elevation min: 622 max: 636Slope min 1 % max: 19 %
SOC dynamics and soil redistribution modelling in Mediterranean agroecosystems
CONTINENTAL MEDITERRANEAN
Mean annual T: 13 °CMean annual P: 500mm
1.6 ha cereal field
Elevation min: 622 max: 636Slope min 1 % max: 19 %
SOC dynamics and soil redistribution modelling in Mediterranean agroecosystems
CONTINENTAL MEDITERRANEAN
Mean annual T: 13 °CMean annual P: 500mm
1.6 ha cereal field
156 bulk soil samples
Elevation min: 622 max: 636Slope min 1 % max: 19 %
SOC dynamics and soil redistribution modelling in Mediterranean agroecosystems
10 m GRID
Calcisols
CONTINENTAL MEDITERRANEAN
Mean annual T: 13 °CMean annual P: 500mm
1.6 ha cereal field
156 bulk soil samples
Elevation min: 622 max: 636Slope min 1 % max: 19 %
SOC dynamics and soil redistribution modelling in Mediterranean agroecosystems
21 reference samples
Calcisols
10 m GRID
CONTINENTAL MEDITERRANEAN
Mean annual T: 13 °CMean annual P: 500mm
1.6 ha cereal field
156 bulk soil samples
SOC dynamics and soil redistribution modelling in Mediterranean agroecosystems
21 reference samples
2D Spatialanalysis
SPEROS-C Van Oost et al. 2005
SPEROS model (Van Oost et al., 2003) ICBM, Andrén and Kätterer, 1997).
Relate soil movement traced with137Cs with the lateral variations of SOC
Simulate soil redistribution and itseffect on SOC within the soil profile
Model calibrationspatially distributed data 137Cs derived rates
SOC stocks measured in the study samples
1507 Bq m-2 5.4 kg m-2
SOC dynamics and soil redistribution modelling in Mediterranean agroecosystems
137Cs SOC
n=156 > 2 mm Clay Silt Sand CO32- 137Cs 137Cs
kg m-2 % % % % % Bq kg-1 Bq m-2
SOC -0.275* 0.310* 0.267* -0.340* -0.186* 0.327* 0.411*
80 % siltloam
SOC dynamics and soil redistribution modelling in Mediterranean agroecosystems
137Cs SOC
n=156 > 2 mm Clay Silt Sand CO32- 137Cs 137Cs
kg m-2 % % % % % Bq kg-1 Bq m-2
SOC -0.275* 0.310* 0.267* -0.340* -0.186* 0.327* 0.411*
80 % siltloam
Information on grain size aggregatesdistribution and sediment propertiesthat can be used in soil erosionmodelling
Velocity settling tubes
n=156 Mean S.D. CV% Min Max
SOC obs 3.49 0.97 27.82 0.96 7.34
SOC mod 3.59 0.26 7.25 2.82 4.55
0.06 g C m-2 y-1 0.04 g C m-2 y-1
SOC dynamics and soil redistribution modelling in Mediterranean agroecosystems
n=119 n=39
3.5 3.8
SPEROS-C
n=98 n=50
3.3 3.8
137Cs
SOIL REDISTRIBUTION RATES
SOC REDISTRIBUTION
SPEROS-C
Mg ha-1 y-1
Conventional tillage Minimum tillage
137CsMg ha-1 y-1
70% erosion 78% erosion
The goodness of fit Nash–Sutcliffe (NS) R-squared (R2Mean error (ME)
The main factor for soil redistribution is runoff through the gully system triggeringthe selective removal of finer soil particles mobilized the rich carbon finefraction affects the depletion of soil particles and, therefore, SOC.
Settling velocity measurements provide direct information on soil aggregatedistribution with implications on soil and SOC transportability that can beused in soil erosion modelling.
The combination of the spatially distributed SPEROS-C model combinedwith 137Cs measurements is a potential tool to evaluate erosion inducedcarbon fluxes.
SOC dynamics and soil redistribution modelling in Mediterranean agroecosystems
SOC dynamics and soil redistribution modelling in Mediterranean agroecosystems
Erosion, and Soil and Water Evaluation Group EEAD-CSIC, Spain
JRC - Erosion Modelling Workshop, Ispra 2017
Thank you for your attention
SOC dynamics and soil redistribution modelling in Mediterranean agroecosystems
Erosion, and Soil and Water Evaluation Group EEAD-CSIC, Spain
JRC - Erosion Modelling Workshop, Ispra 2017
Thank you for your attention
SSS6.8/BG9.56 The impact of soil organic carbon loss on environmental servicesConvener: Laura Quijano Co-conveners: Nikolaus J. Kuhn, Leticia Gaspar, Ana Navas, Manuel Seeger, Chantal HendriksWed 26 April