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Experiments and Modeling of Water and Energy Transfer in Agro-ecosystem
Yi LUO Zhu OUYANGYi LUO Zhu OUYANGYucheng Comprehensive Experiment Station, CASYucheng Comprehensive Experiment Station, CAS
Sept, 2002
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Outline
(1) Background(2) IEM in Field Scale Framework and Components of the Model
Field Exp., Model Validation (3) IEM in Regional Scale (4) No Conclusion
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Background
Processes in Field Scale
Processes in Regional or Watershed Scale
Groundwater
Soil
Land Use/Cover
Ground monitoring
RS
Integrated Ecological Modeling
CropS: Crop and Soil system
model
SWAT/MODFLOW
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IEM in Field Scale-Framework and Components
SQED sIP
dt
d12,1
11
SQQD iiiii
ii dt
d
1,,1
SQQD NNNNN
N dt
d
,1
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Currently, CropS can simulate:(1) Soil water dynamics, infiltration(2) Evaporation and transpiration(3) Root water uptake(4) Drainage percolation(5) Photosynthesis, and(6) CO2 flux from canopy
IEM in Field Scale- Framework and Components
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Modified Feddes Root Uptake Model
T
dZt,ZRht,ZRh
t,ZS rLr0
T
dZhh
t,ZS rLr0
Feddes Model
Root Density Profile Function
Modified Modified FeddesFeddes ModelModel
IEM in Field Scale- Framework and Components
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IEM in Field Scale- Field Exp. And Validation
Soil and Root Profiles Sampling
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IEM in Field Scale- Field Exp. And Validation
0.0
0.5
1.0
1.5
2.0
2.5
3.0
0 20 40 60 80 100 120 140
土层深度 /cm
根长
密度
cm
/cm
3
Samples of winter wheat root
Root length density profile(CI201)
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IEM in Field Scale- Field Exp. And Validation
Soil properties and parameters:
(1) Texture
(2) Retention curves
(3) Hydraulic conductivities
Soil Physics Lab, Yucheng Agri. Exp. St.
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IEM in Field Scale- Field Exp. And Validation
SPAC System Observations :(1) Soil and Root profiles
(2) Soil moisture profile and groundwater
level
(3) Transpiration by lysimeter
(4) Crop growth
(5) Meteo. factors 、 CO2 flux
(6) Leaf photosynthesis and stomata
resistance
Yucheng Agri. Exp. St.
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160
140
120
100
80
60
40
20
00.0 0.1 0.2 0.3 0.4
May-6 M-R (M) Feddes (M) S-I (M)Í
Á²ãÉî¶È (cm
)0.0 0.1 0.2 0.3 0.4 0.5
ÍÁÈÀÌå»ýº¬Ë®Á¿
May -6 Feddes Feddes (M)
Comparison among soil water profiles simulated by different root uptake Comparison among soil water profiles simulated by different root uptake modelsmodels
Volumetric soil water content
Soil d
ep
th
(cm
)
IEM in Field Scale- Field Exp. And Validation
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IEM in Field Scale- Field Exp. And Validation
0.00
0.10
0.20
0.30
0.40
0 20 40 60 80 100
Soil depth /cm
Vo
l. so
il w
ater
co
nte
nt
4-17(M) 4-17(S)
Comparison among soil profiles by CropS and the measured
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IEM in Field Scale- Field Exp. And Validation
-2
0
2
4
6
8
10
120:0
0
6:0
0
12:0
0
18:0
0
0:0
0
6:0
0
12:0
0
18:0
0
0:0
0
Time
ET
/m
m/d
ET
BWRET
ET = 0.9673BWRET + 0.8063R2 = 0.9376
0
5
10
15
0 5 10 15
波文比法(BWRET) /mmd
(ET)
模拟
值 /
mm
/d
Comparison of ET Between CropS to Bowen Ratio Approach
Diurnal Process of ET
Correlation Analysis
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IEM in Field Scale- Field Exp. And Validation
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
8:0
0
16:0
0
0:0
0
8:0
0
16:0
0
0:0
0
8:0
0
Time
CO
2 F
lux
CO2 flux calculated with Bowen Ratio approach
Comparison of CO2 fluxes by CropS and measurement
0.0
0.5
1.0
1.5
2.0
2.5
18:0
0
8:0
0
22:0
0
12:0
0
2:0
0
16:0
0
6:0
0
20:0
0
10:0
0
0:0
0
14:0
0
4:0
0
18:0
0
8:0
0
22:0
0
12:0
0
2:0
0
16:0
0
6:0
0
Time
CO
2 F
lux
CO2Flux(M)
CO2Flux(S)
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IEM in Field Scale- Field Exp. And Validation
-5
0
5
10
15
0 480 960 1440 1920
Time /hours
Flu
x /m
m/d
-50
0
50
100
150
Ra
infa
ll a
nd
Irr
i. /m
mIrrigation Rainfall 100cm 200cm
Percolation processes simulated by CropS at the depths of 100cm and 200cm, respectively
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IEM in Watershed Scale
MODFLOW
InterfaceSWAT
RS Info.
IEM
Eco-hydrological System
Eco-hydrological Processes Modeling in Watershed Scale
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IEM in Watershed Scale
Target areas
Hetao Irrigation District
11000KM2
Panzhuang Irrigation District3300KM2
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IEM in Watershed Scale
Expected Outcomes1. Dynamics of shallow groundwater table under
influence of
change of land use/cover
irrigation (diversion from Yellow river and groundwater use)
2. Effects of shallow ground water table fluctuation on
land salinization
desertification
wetland preservation(water quantity and quality)
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No Conclusions
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Thanks For Your Attention !