基于灰色关联度的石漠化地区土壤质量评价

Evaluation of Soil Quality in Rocky Desertification Area Based on Grey Relational Degree

【目的】釆取科学的评价方法,客观准确评价土壤质量,为石漠化地区预防土壤退化和改善土壤质量提供参考。【方法】以湖北省鹤峰县石漠化地区为研究对象,综合测定了土壤的物理、化学和生物性质的18项土壤属性指标,利用主成分分析和相关性分析,确定评价指标的最小数据集,结合熵权法确定参评指标的权重值,并运用灰色关联度分析法计算加权关联度值。【结果】根据加权关联度值的大小排序来看,研究区的土壤质量高低依次为:下坪>中营>燕子>五里>走马;结合土壤质量评判标准表可得,下坪的土壤质量等级为Ⅱ级,中菅为Ⅲ级,燕子和五里均为Ⅳ级,走马为Ⅴ级;且研究区整体的土壤质量属于中等偏下的水平与当地实际情况相一致。【结论】本文的研究方法可以客观公正的评价土壤质量,且该方法计算简便、思路清晰,为土壤质量评价提供了一种新的尝试。

【Objective】This paper aimed to evaluate soil quality objectively and accurately by scientific evaluation methods,which could pro-vide references for preventing soil degradation and improving soil quality in rocky desertification areas.【Method】Taking the rocky desertification area of Hefeng county in Hubei province as the research object,18 soil attribute indexes of physical,chemical and biological properties of soil were determined comprehensively.The minimum data set of evaluation indexes was determined by principal component analysis and correlation analysis.The weighted values of evaluation indexes were determined by entropy weight method,and the weighted correlation values were calculated by grey correlation analysis method.【Result】According to the ranking of the weighted correlation degree,the order of soil quality in the study area was Xiaping>Zhongying>Swallow>Wuli>Walking Horse.According to the standard table of soil quality evaluation,the grade of soil quality in Xiaping was grade Ⅱ,Zhongying was grade Ⅲ,Swallow and Wuli were grade Ⅳ,Walking Horse was grade Ⅴ,and the overall soil quality in the study area was of grade Ⅴ and consistent with local situation.【Conclusion】The method in this paper can objectively and impartially evaluate soil quality and is simple in calculation and clear in thinking,which provides a new attempt for soil quality evaluation.