基于权重分析的土壤综合肥力评价方法

Method of Comprehensive Evaluation on Soil Fertility on the Basis of Weight Analysis

为了解决传统土壤肥力评价方法赋权不完善的问题,通过权重分析,引入经验权重与统计权重的概念,提出了综合权重法,并以湖北省孝昌县高岗村土壤分析为例,将综合权重法与2种传统土壤肥力评价方法(层次分析法、内梅罗指数法)作比较。结果表明,综合权重法与层次分析法、内梅罗指数法的土壤肥力指数(SFI)变异系数相差较小(分别为22.1%、23.0%和22.5%),且三者的SFI呈现极显著的正相关关系(p=0<0.001);综合权重法与内梅罗指数法相比SFI整体偏大,且其权重向量与层次分析法的相关关系不显著(p=0.103>0.05)。表明了综合权重法与传统方法的相对一致性和差异性。基于综合权重法,高岗村耕地肥力整体良好,Ⅰ、Ⅱ、Ⅲ等级土地约占总耕地面积的95%。

As the traditional evaluation methods of soil fertility could not give appropriate weight for evaluation indexes,empirical weight and statistical weight were brought up according to weight analysis,and the new method,comprehensive weighting method was put forward in this paper.Taking the soil analysis in Gaogang Village,Xiaochang County,Hubei Province as an example,comprehensive weighting method was compared with two kinds of traditional evaluation methods（analytic hierarchy process and Nemero index method）.The results showed that the variation coefficients of soil fertility index（SFI）,obtained by these three methods,were 22.1%,23.0% and 22.5% respectively and had tiny differences,and SFI of the three methods showed a significant positive correlation（p=00.001）;the values of SFIwith comprehensive weighting method was larger than that of Nemero index method,and there was no significant positive correlation between weight vectors of comprehensive weighting method and analytic hierarchy process（p=0.1030.05）.There were the consistency and difference between comprehensive weighting method and traditional evaluation methods.Based on comprehensive weighting method,the general fertility of cultivated soil in Gaogang Village was good,andⅠ,Ⅱ,Ⅲclasses land area accounted for about 95 percent of the total area of cultivated land.