E. Priesack and S. Gayler Workshop Halle 18.-20.Sept. 2005 Modelling Soil-Plant-Atmosphere...
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Transcript of E. Priesack and S. Gayler Workshop Halle 18.-20.Sept. 2005 Modelling Soil-Plant-Atmosphere...
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E. Priesack and S. Gayler
Workshop Halle 18.-20.Sept. 2005
Modelling Soil-Plant-Atmosphere Interactions of the long-term experiment
Bad Lauchstädt
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Originally Expert-N is an agro-ecosystem model which can be applied to consult farmers to
• optimize (N-) fertilization
• predict crop growth
• understand dynamics of agro-ecosystems
• avoid groundwater pollution by nitrate
• reduce nitrous oxide emissions
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Rooted Zone
Groundwater
Unsaturated Zoneleaching
Lateral Flow
Lateral Flow
Water BalancePrecipitation
Infiltration
Evaporation
Interception Run off
Transpiration
Root WaterUptake
capillary rise
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root zone
groundwater
unsaturated zone
N-fixation
organic fertiliser
mineral fertiliser
nitrification
NH4+ NO2
- NO3-
organic N
mineralisation
immobilisation
N removed by harvesting
NH3 N2 N2ONOx
volatilisation denitrification
NO3- - leaching
lateral transport
lateral transport
Nitrogen Balance
N-deposition
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Model application needs input data about
• basic soil parameters
• climatic and weather conditions
• land use management
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Expert-N Datamanagement
ASCII
interface
Expert-N Simulatorsystem control process calculation
graphical
output
ASCII
output
ASCII
interface
SQL interface
ASCII
interface
External geographic data
GIS ArcView
SQL interface
Manual data input
Expert-N DatabaseSimulation-Objects / MSWD-Library
ASCII
interface
External data storage
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Litter
Manure Humus
ManureSurfmanure
roots
LitterSurfresidues mineralisation
added organic matter
Soil Organic Matter Pools Mineralisation Module
according to the model SOILN (Johnsson et al. 1987)
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Wetter Bad Lauchstaedt (1902 – Wetter Bad Lauchstaedt (1902 – 2002)2002)
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Bodenhorizonte Profil 1Bodenhorizonte Profil 1
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PflanzendatenPflanzendaten
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MineraldüngungMineraldüngung
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Organische DüngungOrganische Düngung
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BodenbearbeitungBodenbearbeitung
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SimulationsobjekteSimulationsobjekte
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Expert-N Model ConfigurationExpert-N Model Configuration
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daily CO2 emission
0
5
10
15
20
25
30
35
40
27.08
.200
3
16.10
.200
3
05.12
.200
3
24.01
.200
4
14.03
.200
4
03.05
.200
4
22.06
.200
4
11.08
.200
4
30.09
.200
4
19.11
.200
4
08.01
.200
5
kg(C
O2-
C)/
(ha*
d)
d_CO2_Em
Reihe2
Mineralisation Model Mineralisation Model CalibrationCalibration
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DC
0102030405060708090
100
08.08.1997 21.12.1998 04.05.2000 16.09.2001 29.01.2003 12.06.2004
( -
)
Yield
0
5000
10000
15000
20000
25000
08.08.1997 21.12.1998 04.05.2000 16.09.2001 29.01.2003 12.06.2004
kg/h
a
vegetative biomass above ground
storage organs
Expert-N Plant SimulationExpert-N Plant Simulation
N-Uptake
0
50
100
150
200
250
300
350
08.08.1997 21.12.1998 04.05.2000 16.09.2001 29.01.2003 12.06.2004
kg
(N)/
ha
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80
85
90
95
100
105
110
1999 2000 2001 2002 2003 2004
rTOC (0-200cm) (sim.) rTOC (0-20cm) (meas.)
Observed and simulated rTOC
values as function of time
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Mineralisation Model Mineralisation Model ParametrisationParametrisation
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Long-term Simulation Long-term Simulation (1906-2002):(1906-2002):
YieldYieldstorage organs (kg/ha)
0
2000
4000
6000
8000
10000
12000
14000
16000
18000
20000
0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000
measured
sim
ula
ted
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relative TOC (1903-2002)
0
20
40
60
80
100
120
00/01/1900 08/09/1913 18/05/1927 24/01/1941 03/10/1954 11/06/1968 18/02/1982 28/10/1995 06/07/2009
kg/h
a
rTOC(0-200cm) sim. rTOC(0-20cm) meas.
Long-term Simulation Long-term Simulation (1906-2002):(1906-2002):relative TOCrelative TOC
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Results are only very preliminary:
Plant growth (potato!) and
C- and N cycling needs further calibration
Steps IIb and IIc were not considered
ConclusionsConclusions