基于主成分分析的水土保持生态效应评价指标敏感性分析

Sensitivity Analysis of Ecological Benefit Assessment of Soil and Water Conservation Evaluation Index Based on Principal Component Analysis

为筛选出水土保持生态效应评价的影响因素中的高敏感性指标,以新疆建设兵团农一师垦区的生态效应评价指标敏感性分析为例,根据该地区的水土流失类型及水土保持措施特点,选取该地区包括林草覆盖率在内的7个代表性指标进行主成分分析,并按照敏感性大小对各指标排序。结果表明,指标敏感性由大到小排序为林草覆盖率、盐碱化百分比、土壤风蚀面积占区域总面积百分比、沙化土地百分比、耕地面积百分比、风蚀模数、沙尘暴日。研究成果可为水土保持决策制定提供依据。

In order to screen the high sensitivity indicators of influencing factors for ecological effect evaluation of soil and water conservation, taking the typical reclamation area in XinJiang as an example, based on the types of water and soil loss and the characteristics of soil and water conservation measures, the principal component analysis was use to se- lect seven indexes, and the sensitivity of each index was sorted. The result show that the sort of the sensitivity index from strong to weak is as follows： vegetation coverage rate, salinization percentage, soil erosion area percentage, desertifica- tion percentage, farmland area percentage, wind erosion modulus, sandstorm days. The research can provide the basis for water and soil conservation decision-making.