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

The performance of the PASTIS model was evaluated to simulate soil C and N fluxes under real field conditions with conventional moldboard plowing (CT) and no-tillage (NT) systems differentiated for 33 yr for a loamy soil in northern France. Afterward, the influences on the C and N fluxes by soil temperature, soil water content, and quantity and localization of soil organic matter (SOM) and crop residues in the soil profile were determined. The model PASTIS was able to provide good simulations for the dynamics of soil water content and temperature, CO 2 emissions, residue decomposition, and N mineralization. Simulation showed that the presence of the mulch layer in NT reduced cumulative total water evaporation and increased water drainage at the bottom of the 25-cm depth. Furthermore, simulation showed that the larger cumulative total CO 2 flux in NT resulted from larger CO 2 emissions as a product of crop residue decomposition and not as product of SOM decomposition. The larger amount of accumulated residues of previous crops in NT more than compensated for the slower residue decomposition rate of surface compared with incorporated residues. It was the water content of the surface crop residues that largely controlled the magnitude of this difference in decomposition rate of the crop residues between CT and NT. This means that, besides the amount of crop residues in both tillage systems, the distribution of rainfall and potential evaporation have a large influence on the differences in C and N fluxes between the two tillage systems.

[1]  B. Mary,et al.  Experimental and simulated soil mineral N dynamics for long-term tillage systems in northern France , 2007 .

[2]  S. Recous,et al.  Modelling water, carbon and nitrogen dynamics in soil covered with decomposing mulch , 2007 .

[3]  S. Recous,et al.  Soil moisture, carbon and nitrogen dynamics following incorporation and surface application of labelled crop residues in soil columns , 2006 .

[4]  H. Boizard,et al.  C and N mineralization of undisrupted and disrupted soil from different structural zones of conventional tillage and no-tillage systems in northern France , 2006 .

[5]  Modelling water flow, nitrogen transport and root uptake including physical non-equilibrium and optimization of the root water potential , 2005, Fertilizer research.

[6]  M. Flury,et al.  Hydraulic Properties in a Silt Loam Soil under Natural Prairie, Conventional Till, and No‐Till , 2004 .

[7]  G. Richard,et al.  Hydraulic Properties of Soil–Straw Mixtures , 2004 .

[8]  E. Alberts,et al.  Tillage and Crop Influences on Physical Properties for an Epiaqualf , 2004 .

[9]  S. Recous,et al.  Decomposition in the field of residues of oilseed rape grown at two levels of nitrogen fertilisation. Effects on the dynamics of soil mineral nitrogen between successive crops , 2000, Nutrient Cycling in Agroecosystems.

[10]  S. Recous,et al.  Modelling water, nitrogen and carbon fluxes during decomposition of crop residues, incorporated or left at the soil surface , 2004 .

[11]  Bruno Mary,et al.  Modelling carbon and nitrogen dynamics in a bare soil with and without straw incorporation , 2003 .

[12]  J. Six,et al.  Short communication Reciprocal transfer of carbon and nitrogen by decomposer fungi at the soil -litter interface , 2003 .

[13]  Y. Coquet,et al.  Variation of hydraulic conductivity in a tilled soil , 2002 .

[14]  E. Priesack,et al.  Modelling the mineralisation of plant residues on the soil surface , 2002 .

[15]  T. A. Breland,et al.  Carbon mineralization, fungal and bacterial growth, and enzyme activities as affected by contact between crop residues and soil , 2002, Biology and Fertility of Soils.

[16]  S. Recous,et al.  Impact of residue quality and location in soil on the C and N mineralisation of residues from cropping systems from Cerrados, Brazil , 2002 .

[17]  B. Mary,et al.  Evaluation of a nitrogen transport and transformation model in a bare soil , 2001 .

[18]  Peter J. Thorburn,et al.  Modelling decomposition of sugar cane surface residues with APSIM–Residue , 2001 .

[19]  P. Unger,et al.  Biomass and residue cover relationships of fresh and decomposing small grain residue. , 2000 .

[20]  S. Recous,et al.  Biochemical quality of crop residues and carbon and nitrogen mineralization kinetics under nonlimiting nitrogen conditions , 2000 .

[21]  W. Edwards,et al.  Conservation tillage and macropore factors that affect water movement and the fate of chemicals , 2000 .

[22]  S. Recous,et al.  Carbon, nitrogen and microbial gradients induced by plant residues decomposing in soil , 1999 .

[23]  R. Lal.  Soil Compaction and Tillage Effects on Soil Physical Properties of a Mollic Ochraqualf in Northwest Ohio , 1999 .

[24]  R. Dalal,et al.  APSIM's water and nitrogen modules and simulation of the dynamics of water and nitrogen in fallow systems , 1998 .

[25]  Bruno Mary,et al.  Modelling temperature and moisture effects on C-N transformations in soils: comparison of nine models , 1997 .

[26]  R. K. Hubbard,et al.  Physical properties of a clayey coastal plain soil as affected by tillage. , 1994 .

[27]  Henk Ritzema,et al.  Water in the unsaturated zone. , 1994 .

[28]  T. Dao.  Tillage and winter wheat residue management effects on water infiltration and storage , 1993 .

[29]  J. Benjamin.  Tillage effects on near-surface soil hydraulic properties , 1993 .

[30]  S. Tamari,et al.  A simple method for determining soil hydraulic properties in the laboratory , 1993 .

[31]  W. H. Paulson,et al.  Tillage effects on measured soil hydraulic properties , 1992 .

[32]  B. Lowery,et al.  Effects of conservation tillage on hydraulic properties of a Griswold silt loam soil , 1991 .

[33]  W. W. Nelson,et al.  Spatial Variation of Crop Residue Incorporated by Tillage , 1991 .

[34]  D. Coleman,et al.  Let the soil work for us , 1988 .

[35]  J. Currie.  Gas diffusion through soil crumbs: the effects of compaction and wetting , 1984 .

[36]  W. B. Voorhees,et al.  Unsaturated Water Flow Through a Simulated Wheel Track 1 , 1981 .

[37]  Van Genuchten,et al.  A closed-form equation for predicting the hydraulic conductivity of unsaturated soils , 1980 .

[38]  W. E. Larson,et al.  Hydraulic and thermal properties of a sandy soil as influenced by incorporation of sewage sludge , 1977 .