Carbon sequestration in the uplands of Eastern China: An analysis with high-resolution model simulations

摘要: Abstract Using the DeNitrification-DeComposition (DNDC, version 9.5) model, we investigated soil organic carbon (SOC) changes from 1980 to 2009 in Eastern China's upland-crop fields northern Jiangsu Province. A currently most detailed high-resolution database, containing 17,024 polygons at a scale of 1:50,000, derived 983 unique upland profiles, was used. coarser county-level database also used for pair-wise simulation comparison. We found that SOC modeled with differ significantly those data, deviation ranging −64% 8.0% different counties. This implies coarse data may lead large biases simulation. With model estimates increase 37.89 Tg C top soils (0–50 cm) over study area 3.93 Mha past three decades, an average rate 322 kg C ha −1  year . The accumulation region accounts 10.2% annual national sequestration soils, compared fraction 3.7% total China. underscores its significance climate mitigation. change varied between 61 519 kg C ha , mainly driven by variations N-fertilizer and manure applications. highlights databases quantifying changes. Our will support farming management this region.