关于《生态环境状况评价技术规范(试行)》中土地退化指数的权重及计算方法的探讨

Weight of Land(Soil) Degradation Indices and Optimization of Their Calculation in "Technical Criteria for Evaluation of Ecological Environment(Trial)"

对HJ/T 192—2006《生态环境状况评价技术规范(试行)》(以下简称《规范》)中加权归一化指数的技术路线进行分析,得出了《规范》中土地退化状态、土地退化指数与生态环境状况指数(EI)逻辑相悖的结论,在此基础上提出了"调整侵蚀度赋权顺序"和"差减土地退化分级指数"2种土地退化指数计算方法,并对2种方法进行验证。模拟计算显示,在中度或重度侵蚀比例相同时,轻度侵蚀比例高的区域EI值大;在轻度侵蚀比例相同时,中度侵蚀比例高的区域EI值大。2种方法的计算结果符合生态环境状态评价的一般逻辑,统计检验显示2种方法的计算结果同步性高,均可应用于实际生态环境状况评价。

Based on analysis of the technical route of the weighted normalized indices in ＂Technical Criteria for Evaluation of Eco-Environment＂（HJ/T 192—2006）,a conclusion was reached logically contradicting the specifications of HJ/T 192—2006,regarding land degradation,land degradation index and ecological environment index（EI）.On such a basis,two computation methods,i.e.＂adjusted erodibility enpowering order method＂ and ＂minusing land degradation grading index method＂ were brought forth and verified.Analog computation using the methods demonstrates that of two plots similar in the proportion of moderate or severe erosion,the one higher in the proportion of light erosion is higher in EI of the two plots similar in the proportion of light erosion the one with higher proportion of moderate erosion is higher in EI.It was found that the outcomes of the computation using the two methods tallied with the common logic of evaluation of eco-environment and were highly synchronous in statistical check,demonstrating that both methods are applicable to practical evaluation of eco-environment.