Spatial Distribution and Temporal Dynamics of Soil Carbon Removal Caused by Water Erosion in China  

中国区域土壤水蚀碳量空间分布及其时间动态(英文)

作　　者：高艳妮[1,2] 方华军[1] 于贵瑞[1] 王绍强[1] 

机构地区：[1]中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室CERN综合研究中心,北京100101 [2]中国科学院研究生院,北京100049

出　　处：《Journal of Resources and Ecology》2011年第3期210-216,共7页资源与生态学报（英文版）

基　　金：supported by the National Key Basic Research and Development Program(2010CB833500);the"Strategic Priority Research Program-Climate Change:Carbon Budget and Relevant Issues"of the Chinese Academy of Sciences(XDA05050601);the National Natural Science Foundation of China(31070435,41071166)

摘　　要：Using water erosion data from three national soil erosion remote-sensing surveys （the first：1985-1986; the second：1995-1996; the third： 2000-2001） and carbon density data from the second national soil survey （1979-1992）, we computed soil carbon removal caused by water erosion, and analyzed its spatial distribution and temporal dynamics in China. Results revealed that the total removal of soil carbon caused by water erosion was about 74.61 Tg C y^-1 , of which 51.49 Tg C y^-1 was organic carbon, and 23.12 Tg C y^-1 was inorganic carbon. The main erosion level of the whole is moderate erosion. Among the seven erosion regions, the Southwest Karst Region had the most significant removal of soil organic carbon, which was 26.48% of the total and mainly due to its moderate erosion. In contrast, about 67.62% of the soil inorganic carbon removal occurred in the Loess Plateau Region, which mainly due to its highly intense and intense erosion. As a whole, the removals of soil carbon caused by water erosion represented a decreasing trend among the three national soil erosion remote-sensing surveys. Between the first and the second survey, soil carbon removal decreased by 11.66 Tg C y^-1 , of which 81.93% was organic carbon. Compared with that in the second survey, soil carbon removal decreased by 1.65 Tg C y^-1 in the third survey, of which 1.514 Tg C y^-1 was organic carbon, and 0.134 Tg C y^-1 was inorganic carbon.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。

关 键 词：China water erosion soil organic carbon soil inorganic carbon soil erosion regions 

分 类 号：S157[农业科学—土壤学]