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Modeling Soil Carbon from Forest and Pasture Ecosystems of Amazon, Brazil

^a C.C. Cerri, Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, CP.96. Piracicaba, Brazil
^b Agriculture and the Environment Division, IACR-Rothamsted, Harpenden, Hertfordshire AL5 2JQ, UK
^c Institut de Recherche pour le Développement, France

View larger version (16K): [in a new window]   Fig. 1. Predicted (solid line) and measured (symbols) total soil C in the 0- to 30-cm layer from the Nova Vida Ranch chronosequence, Brazil. Clay content assumed to be 286 g kg-1 and C input assumed to be 8.28 Mg ha-1 yr-1; pasture age () and forest (*). Bars indicate standard errors.

View larger version (17K): [in a new window]   Fig. 2. Modeled (solid line) and measured (symbols) total soil C in the 0- to 10-cm layer from the Nova Vida Ranch chronosequence, Brazil. Clay content assumed to be 234 g kg-1 for all pastures and C input assumed to be 4.68 Mg ha-1 yr-1; pasture age () and forest (*).

View larger version (14K): [in a new window]   Fig. 3. Effects of varying the DPM/RPM ratio, input distribution and clay content on model outputs. ——— Input 8.28 Mg C ha-1 yr-1, distributed uniformly through the year; DPM/RPM ratio 1.44; clay content 286 g kg-1 soil (same as Fig.1). – – – – Input 8.28 Mg C ha-1 yr-1, distributed uniformly through the year; DPM/RPM ratio 0.67; clay content 286 g kg-1 soil. –··–··–··– Input 8.28 Mg C ha-1 yr-1, all added as a simple pulse in June; DPM/RPM ratio 1.44; clay content 286 g kg-1 soil. - - - - - Input 8.28 Mg C ha-1 yr-1, distributed uniformly through the year; DPM/RPM ratio 1.44; clay content 153 g kg-1 soil.

View larger version (17K): [in a new window]   Fig. 4. Predicted (solid line) and measured (symbols) soil microbial biomass C content of the 0- to 10-cm soil layer from the Nova Vida Ranch chronosequence, Brazil. Clay content assumed to be 234 g kg-1 for all pastures and C input assumed to be 4.68 Mg ha-1 yr-1; pastures created at different times () and forest (*).