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Modeling Soil Carbon and Nitrogen Dynamics in No-till and Conventional Tillage Using PASTIS Model

^a INRA, Unité d'agronomie de Laon-Reims-Mons, 2 Esplanade Roland Garros, BP 224, 51686 Reims Cedex 2, France
^b INRA, Unité d'Agronomie de Laon-Reims-Mons, rue Fernand Christ, 02007 Laon Cedex, France
^c IRAD, Unité de Recherche Risque Environnemental, avenue Agropolis, 34398 Montpellier Cedex 5, France
^d INRA, Unité d'Agronomie de Laon-Reims-Mons, rue Fernand Christ, 02007 Laon Cedex, France
^e INRA, Unité de Science du Sol d'Orléans, 2163 Domaine de Limère, BP 20619, 45166 Olivet, France
^f INRA, Unité d'agronomie de Laon-Reims-Mons, 2 Esplanade Roland Garros, BP 224, 51686 Reims Cedex 2, France

View larger version (37K): [in this window] [in a new window]   Fig. 1. Measured and simulated water contents of the 0- to 5- and 5- to 20-cm soil layers of the conventional tillage and no-tillage plots. Symbols are measured data, lines are simulated data.

View larger version (28K): [in this window] [in a new window]   Fig. 2. Simulated water contents of the surface mulch of the no-tillage plot.

View larger version (22K): [in this window] [in a new window]   Fig. 3. Simulated cumulative total evaporation at the top and water drainage at the bottom of the 0- to 25-cm soil profile of the conventional tillage (CT) and no-tillage (NT) plots.

View larger version (19K): [in this window] [in a new window]   Fig. 4. Measured and simulated amounts of C in crop residues of the conventional tillage (CT) and no-tillage (NT) plots. Bars indicate standard errors of the measured values.

View larger version (20K): [in this window] [in a new window]   Fig. 5. Measured and simulated NO3–N contents in the 0- to 5- and 0- to 25-cm soil layers in the conventional tillage plots under the assumption that crop residues in the PASTIS model are homogeneously distributed throughout the entire soil volume. Bars indicate standard errors of the measured values.

View larger version (28K): [in this window] [in a new window]   Fig. 6. Measured and simulated NO3–N contents in the 0- to 5- and 0- to 25-cm soil layers in the conventional tillage (CT) and no-tillage plots, under the assumption that crop residues in CT are located in 10% of the entire soil volume. Bars indicate standard errors of the measured values.

View larger version (24K): [in this window] [in a new window]   Fig. 7. Measured and simulated cumulative CO2 emission in the conventional tillage (CT) and no-tillage (NT) plots, under the assumption that crop residues in CT are located in 10% of the entire soil volume.

View larger version (40K): [in this window] [in a new window]   Fig. 8. Measured and simulated daily CO2 emissions in the conventional tillage (CT) and no-tillage plots, under the assumption that crop residues in CT are located in 10% of the entire soil volume. Bars indicate standard errors of the measured values.

View larger version (25K): [in this window] [in a new window]   Fig. 9. Simulated cumulative CO2 emissions as a product of decomposition of soil organic matter (SOM) and crop residues in the conventional tillage (CT) and no-tillage (NT) plots, under the assumption that crop residues in CT are located in 10% of the entire soil volume.

View larger version (35K): [in this window] [in a new window]   Fig. 10. Simulated daily CO2 emissions as a product of decomposition of soil organic matter (SOM) and crop residues in the conventional tillage (CT) and no-tillage (NT) plots, under the assumption that crop residues in CT are located in 10% of the entire soil volume.