川西北放牧草地退化分类评价指标体系初探

以川西北地区的放牧草地为研究对象,采用时空替换法研究了未放牧、轻度放牧、中度放牧和重度放牧4种放牧强度下的草地植物群落数量特征和土壤特征.在实地测定大量样方和统计分析的基础上,筛选出草地植物群落物种组成、现存量、草地生产力、土壤有机质含量等几个极具代表性的定性、定量评价指标,初步拟定了川西北高寒草甸草地的放牧退化分类评价指标体系.

Preliminary Study on Classified Index System of Grazing Alpine Meadow in Northwest Sichuan

The methods in which different of space distribution stands for progress of time and the dimension analyses were used to study the grazing degraded alpine meadow in Northwest Sichuan, quantitative characters of alpine meadow plant community under the four grazing intensity of ero-grazing,light-grazing,middle-grazing and heavy-grazing were studied. Based on the investigated results from the plots and statistical screen out the qualitative and quantitative evaluation indexes, including the representative trait such as floristic composition of alpine meadow plant community,the standing crop and productivity of alpine meadow, the content of soil organic matter, combining with the characters of vegetation,soil and meadow productivity indexes etc. The classified index system of the grazing-degraded alpine meadow in north-west Sichuan was drafted.