我国东部土壤有机碳的密度和储量

Density and Storage of Soil Organic Carbon in East China

利用土壤有机碳与土壤剖面深度的统计回归模型,根据全国第二次土壤普查资料,计算了我国东部土壤的有机碳密度和储量。结果表明,我国东北地区土壤有机碳密度变幅为2.5—73.3kgC·m-2,其面积加权平均值为10.5kgC·m-2;在232万km2土壤中剖面有机碳总储量为24.36GtC。我国东南热带亚热带剖面土壤有机碳平均密度变幅为3.9—16.7kgC·m-2,其面积加权平均值为9.52kgC·m-2,较东北地区低;在94.3万km2土壤中0—100cm的有机碳储量为9.35GtC。

Based on soil type data from the Second National Soil Survey, soil organic C (SOC) density and stocks in East China were calculated with an experience model between SOC and soil depth. In addition, influence factors of SOC turnover in cultivated soils were investigated by both field and laboratory experiments. The results showed SOC densities to profile depth in Northeast China varied from 2.5 to 73.3 kg C·m-2 with a mean value of 10.5 kg C·m-2, and total 24.36 Gt (1015 g) C occurs in 2.32 million km2 of soils to the profile depth in this region. In Southeast tropical and subtropical China, mean SOC densities to profile depth ranged from 3.9—16.7 kg C·m-2 with a mean value of 9.52 kg C·m-2, and there was 9.35 Gt C in 0.943 million km2 of soils to a depth of 100 cm.