基于均方差权值法对不同培育措施高寒草甸的现状评价

Assessment of different managements on alpine meadow based on mean-squared deviation weight decision

在天然草地健康评价中各项指标的权重大小对评价结果有着直接而重要的影响。为探讨青藏高原东缘高寒草地健康状况的合理评价模型,通过均方差权值法对甘南桑科草原不同培育措施高寒草地的植物群落盖度、优势层高度、干草产量和植物根层土壤有机质进行客观赋值综合评价。结果表明:1.各种培育措施对高寒草地植物群落结构和特征均有不同程度的影响;2.施肥处理草地健康状况最好,而放牧干扰草地的最差;3.均方差权值法对草地植物盖度和植物群落优势层高度、干草产量及植物根层土壤有机质含量客观赋值可以用于甘南桑科草原草地健康评价。

In multi-indicator synthetic evaluation on rangeland health,the weight of various evaluation index directly influence the result.In order to investigate the reasonable evaluation model for alpine meadow health,the rangeland coverage（%）,dominant canopy height（cm）,dry matter yield（kg/ha）and soil organic matter content of root zone（g/kg）of alpine meadow under different management were used to evaluate the health status by mean square deviation weights method in eastern edge of Tibetan Plateau.The result indicated that,1）the structure and characteristics of vegetation community were influenced by different management to different degreed;2）the health index of fertilization treatment was the highest and the grazing treatment was the lowest;3）the mean square deviation weights method was suitable to evaluate the health status of alpine meadow by properly calculating the weights of coverage,dominant canopy height,dry matter yield and organic matter content of root zone soil.