灰色关联度法在草原土壤质量评价中的应用

在进行吉林西部草原生态环境调查的基础上，对草原土壤进行了理化性质、营养成分等项目的系统测试，选择了有机质、全氮、全磷、全钾、水解性氮、速效磷、速效钾、碱化度、pH值等项目作为评价指标．应用灰色关联度法对草原土壤质量进行综合评价。结果表明：吉林省西部草地以三等和四等居多，已无一等和二等草地。

Application of Grey System Theory in Evaluating Grassland Soil Quality

On the basis of the investigation of grassland environments, physical and chemical characters, and nutrient components of grassland soil in the western part of Jilin province were systematically tested, and the quality of grassland soil in this region was comprehensively evaluated. Evaluation indexes involved organic matter, total N, total P, total K, available N, available P, available K, ESP and pH value. The evaluation principle referred to was grey system theory and the method applied was grey correlation method. The results showed that most grassland in the western part of Jilin province fell into the categories of grade three or grade four, and there didn't exist grassland of grade one or two in the region. Grey correlation method was reliable and applicable.