Résultats de la recherche (2 résultats)

To improve the understanding of map scale associated uncertainty, the DeNitrification–DeComposition (DNDC) model were parameterized with 3 soil polygon-based databases at scales of 1:1,000,000, 1:4,000,000, and 1:14,000,000 to simulate SOC stocks (0
–30 cm) for paddy soils of China and their changes from 1980 to 2008. It is showed that SOC stock estimates decreased as map scale decreased from 1:4,000,000 to 1:14,000,000. The multi-scale simulation results indicate that the application of 1
:1,000,000 scale soil polygon-based database could reduce the inaccuracy of national SOC stock estimates and contribute to improved assessment of continental and global carbon balance.

To reduce uncertainties from upscaling spatial processes of the DeNitrification-DeComposition (DNDC) model for improving the definition of China's paddy soils SOC stocks (0-30 cm) and their changes from 1980 to 2008, a soil polygon-based modeling
. Increases in paddy soil SOC stocks were found predominantly in South, Eastern and Southwest China. Enhancement in the soil databases with higher resolution inputs should improve the C sequestration estimates of any area of interest.

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