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Relationships between soil properties and
contents in trace elements in a landscape
impacted by atmospheric fallouts in Belgium
Vienna (Austria), 8th April 2013
LIÉNARD AMANDINE* & COLINET GILLES
University of Liege – Gembloux Agro-Bio Tech – “Soil & Water Systems“ Unit
STUDY CONTEXT
Contaminated fallouts by
metallic trace elements (MTE)
Cd-Cu-Pb-Zn
Hosted ore
treatment factory
STUDY AREA - LOCALIZATION
Belgium
Wallonia
STUDY AREA - CHARACTERISTICS
Meuse valley
Situation of old
chimney
Loyse river
Forest Crop
Grassland Village
Impact of landscape
factors on MTE
distribution in soils
Interaction between
soil properties and
MTE contents in soils
Factors of variation
MTE mobility
Fate of MTE in contaminated landscape
AIMS
SAMPLING STRATEGY
Sampling points are distributed
between 3 distinct soil types, 3
land uses and 4 wind directions
(36 combinations)
1. Main soil types 2. Land use 3. Wind directions
Loamy soil with good drainage
Loamy soil with poor drainage
Loamy-stony soil with silexite and gravels
METHODOLOGY
i) 247 topsoil (0-20cm) samples are collected
ii) Chemical analyses :
- Pseudo-total (Aqua regia) and available (AA + EDTA (pH4.65))
contents in Ca-Mg-K-Fe-Al-Mn & Cd-Cu-Pb-Zn
- pHwater and pHKCl
- Total Organic Carbon
- N
iii) Statistical analyses :
- log transformation of all parameters excepted pH
- Ancova (2 or 3 ways) with distance as covariate
- Correlation
- PCA
Impact of landscape
factors on MTE
distribution in soils
Interaction between
soil properties and
MTE contents in soils
Variation factors of
MTE mobility
Fate of MTE in contaminated landscape
FIRST AIM
DISTANCE FROM SOURCE: THE MAIN FACTOR INFLUENCING MTE CONTENT
- Content in each MTE decreases with distance - P-value < 0.001 and R2 > 0.5
y = 30877x-1.248 R² = 0.5281
0
10
20
30
40
50
60
70
80
90
0 500 1000 1500 2000 2500 3000
Tota
l cad
miu
m c
on
ten
t (p
pm
)
Source of contamination distance (m)
Relation Cadmium - Distance
DIRECTION OF DOMINANT WINDS : A SECOND FACTOR WHICH INFLUENCES MTE CONTENT
0
1
2
3
4
5
6
7
South West North East
Cadmium content (ppm)
- Typical wind direction in Wallonia is South-West toward North-East
- MTE dispersion is higher along this axe
SOIL TYPES : A THIRD FACTOR WHICH INFLUENCES THE MTE CONTENT
- Presence of a soil type effect for Cd – Pb – Zn total content
- Loamy-stony soils with gravels contain more MTE than
loamy soils
Loamy-Stony(Gravels)Loamy(PoorDrainage)Loamy(GoodDrainage)
3.5
3.0
2.5
2.0
1.5
Lead total (log(ppm))
ab b a
SOIL TYPES : A THIRD FACTOR WHICH INFLUENCES THE MTE CONTENT
Effect maybe due to their position in the landscape
Loamy soil with
good drainage
Loamy soil with
poor drainage
Stony-loamy soil
with gravels
LAND USE : A LAST FACTOR WHICH INFLUENCES THE MTE CONTENT
GrasslandForestCrop
4.0
3.5
3.0
2.5
2.0
Zinc total (log(ppm))
a a a
GrasslandForestCrop
3.5
3.0
2.5
2.0
1.5
Lead total (log(ppm))
b a b
- Two different situations of MTE according to land use
- Cd and Zn total content are not impacted by land use in
opposite to Cu and Pb total content
CONFIRMATION BY PCA ANALYSIS
0.40.30.20.10.0-0.1-0.2-0.3
0.50
0.25
0.00
-0.25
-0.50
-0.75
First Component
Se
co
nd
Co
mp
on
en
t Distance
South
West
East
North
Forest
Grassland
Crop
Loamy soil (poor drainage)
Loamy soil (good drainage)
Stony-loamy (gravels)ZnTot
PbTot
CuTot
CdTot
ZnAvail.
PbAvail.
CuAvail.
CdAvail.
Principal Component Analysis (TS- LU - WD - Distance - MTE)
Impact of landscape
factors on MTE
distribution in soils
Interaction between
soil properties and
MTE contents in soils
Variation factors of
MTE mobility
Fate of MTE in contaminated landscape
SECOND AIM
RELATION BETWEEN SOIL PROPERTIES
AND LANDSCAPE FACTORS
0.40.30.20.10.0-0.1-0.2-0.3
0.5
0.4
0.3
0.2
0.1
0.0
-0.1
-0.2
-0.3
-0.4
First Component
Se
co
nd
Co
mp
on
en
t
Distance
South
West
EastNorth
Forest
Grassland
Crop
Loamy (PD)
Loamy (GD)
Loamy-stony
MnTot
AlTotFeTot
KTot
MgTot
CaTotMnAvail.
PAvail
AlAvail.
FeAvail.
KAvail.
MgAvail.
CaAvail.
N
COT
pHKCl
pHEau
Principal Component Analysis (TS - LU - WD - Distance - Soil parameters)
- No influence of soil type and distance
- Influence of land uses and one wind direction (a geologic impact)
RELATION BETWEEN PHKCL - COT
AND LANDSCAPE FACTORS
- Distance and wind directions factors
don’t affect pHKCl and COT values in soils
- Soil type and land use influence pH and
COT values in soils
GrasslandForestCrop
8
7
6
5
4
3
pHKCl
a
c
b
Comparison of MTE and pHKCl – COT
Distance Wind
direction Soil type Land use
MTE Yes Yes
Yes
(Cd-Pb-Zn)
Yes
(Cu–Pb)
pHKCl No No Yes Yes
COT No No Yes Yes
Impact of landscape
factors on MTE
distribution in soils
Interaction between
soil properties and
MTE contents in soils
Variation factors of
MTE mobility
Fate of MTE in contaminated landscape
THIRD AIM
RELATION BETWEEN MTE AVAILABLE/TOTAL RATIO
AND SOIL TYPE – LAND USE FACTORS
- Cd ratio is not influenced by the two factors
- Cu -Pb and Zn ratio are different according to land use ratio on forest
is always highest
- Zn ratio is modified by soil type loamy-stony soil contains a high
proportion of Zn available content
In forest, the fraction of potentially mobile Cu – Pb and Zn are more higher
as Zn in loamy-stony soil
GrasslandForestCrop
0.65
0.60
0.55
0.50
0.45
0.40
Me
an
(lo
g(p
pm
))
Pb available/total
Loamy-Stony(Gravels)Loamy(PoorDrainage)Loamy(GoodDrainage)
0.22
0.21
0.20
0.19
0.18
0.17
0.16
Me
an
(lo
g(p
pm
))
Zn available/total
Impact of landscape
factors on MTE
distribution in soils
Interaction between
soil properties and
MTE contents in soils
Factors of variation
MTE mobility
Fate of MTE in contaminated landscape
CONCLUSION
-Important impacts for
distance and wind
directions
- Soil and land use are
also significant - Classical relations
- pH and COT variability
is different than MTE
Soil type and land use
impact MTE mobility
THANK YOU FOR YOUR ATTENTION…
RELATION BETWEEN ZN/PB AND ZN/CD
R² = 0.7257
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
Pb
To
t co
nte
nt
(lo
g(p
pm
))
Zn Tot content (log(ppm))
Relation between Zn Tot and Pb Tot
R² = 0.8448
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
Cd
To
t co
nte
nt
(lo
g(p
pm
))
Zn Tot content (log(ppm))
Relation between Zn Tot and Cd Tot
-Contaminants contents are
strongly correlated one with the
other.
- It thus seems that they have
the same signature in term of
landscape dispersion