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基于USLE的土壤侵蚀敏感性评价及其空间自相关分析——以江西省兴国县为例

Assessment of Soil Erosion Sensitivity and Its Spatial Autocorrelation Analysis Based on USLE:A Case Study of Xingguo County in Jiangxi Province

  • 摘要: 土壤侵蚀敏感性评价是生态环境敏感性评价乃至生态功能区划中一项重要的内容。选取典型红壤丘陵区的江西省兴国县为案例区,基于通用土壤流失方程的基本原理,借助ArcGIS和GeoDa软件,分析了研究区的土壤侵蚀敏感性及其空间自相关性。主要结果表明:①2005年研究区的土壤侵蚀敏感性等级以轻度敏感和中度敏感为主,所占面积百分比总计70.25%,高度敏感和极敏感区面积为364.57 km2;②在5%的显著性水平上,53.14%的敏感性观测区存在空间正相关,集中分布于兴国县的西部、南部、中部和北部,另外,46.86%的观测区存在空间负相关,分散在研究区的北部、南部、西部和中部。研究结果可为当地水土保持建设与生态环境建设规划提供参考。

     

    Abstract: Assessment of soil erosion sensitivity is a very important content of the ecological environment sensitivity evaluation and ecological function zoning. Basing on ArcGIS and GeoDa software platform and USLE, the rainfall erosivity (R), soil erodibility (K), slope length and steepness factor (LS) and vegetation management factor (C) around Xingguo County of Jiangxi Province which is located in the typical red soil hilly area were calculated to make a comprehensive assessment and spatial autocorrelation analysis to sensitivity of soil erosion. The main results showed as follows: ①According to the classification criterion of the soil erosion sensitivities, most areas 70.25 % of the region suffered the slight and moderate erosion, while the strong and intense sensitivities covered a large area, which amounted to 364.57 km2; ②In the 5% of the significant level, 53.14% of the sensitivity observation areas were spatial positive autocorrelation, its concentrated distribution is in the south, west, northern and central of Xingguo County, while 46.86% of the observation areas spatial negative autocorrelation, where is in the north, south, west and central of Xingguo County. The results could be beneficial for providing reference to construction planning of soil and water conservation and eco-environment for the local government.

     

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