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本文利用三次全国土壤侵蚀遥感普查数据和第二次土壤普查土壤有机碳和无机碳密度数据,分析了我国土壤水蚀碳量的空间分布及其时间动态。研究结果表明:我国土壤水蚀碳量为74.61TgCy-1,其中有机碳量51.49TgCy-1,无机碳量23.12TgCy-1。在七大水土流失区中,水蚀有机碳量最多的是西南岩溶区,占总水蚀有机碳量的26.48%;水蚀无机碳量最多的是黄土高原区,占总水蚀无机碳量的67.62%。前者以中度水蚀为主,后者以极强度和强度水蚀为主。80年代中期至90年代中期,我国土壤水蚀碳量共减少了11.66TgCy-1,以有机碳迁移量减少为主,占总减少量的81.93%;90年代中期至21世纪初,土壤水蚀碳量依然呈下降趋势,共减少了1.65TgCy-1,其中,有机碳迁移量减少了1.514TgCy-1,无机碳迁移量减少了0.134TgCy-1。
In this paper, three national soil erosion remote sensing census data and the second soil survey soil organic carbon and inorganic carbon density data, analysis of China’s soil water erosion of carbon spatial distribution and time dynamics. The results showed that the amount of soil water erosion in China was 74.61 TgCy-1, of which organic carbon was 51.49 TgCy-1 and inorganic carbon was 23.12 TgCy-1. Among the seven major water and soil loss areas, the southwest karst area has the largest amount of water erosion organic carbon, accounting for 26.48% of the total water erosion organic carbon. The largest amount of water erosion inorganic carbon is the Loess Plateau, accounting for 67.62% of the total water erosion inorganic carbon. The former is dominated by moderate water erosion, which is dominated by very strong and intense water erosion. From the mid-1980s to the mid-1990s, the total amount of soil water erosion in China decreased by 11.66TgCy-1, with a decrease of organic carbon migration, accounting for 81.93% of the total decrease. From the mid-1990s to the early 2000s, The total organic carbon migration decreased by 1.514TgCy-1 and the inorganic carbon migration decreased by 0.134TgCy-1.