ANALYSIS ON PLANT COMMUNITY RESISTANCE TO TRAMPLING BY GRAY MODEL GM(1,1)——A CASE STUDY OF ALPINE MEADOW IN SHANGRI-LA,YUNNAN PROVINCE,CHINA

In order to understand the damage of alpine meadow vegetation in response to short-duration trampling,a controlled trampling experiment was conducted.The changes in vegetation cover after trampling was analyzed by one-way ANOVA and GM(1,1) model.The results were as follow s:(1) Vegetation cover decreases nonlinearly with the increasing of trampling intensity.(2) When the trampling intensity was at the level of 200 500 passes and 500-700 passes,there is a sensible difference in vegetation cover.(3) The trampling intensities were accurate to 220 passes and 680 passes by GM(1,1) model,according to the relationship between relative vegetation cover(RVC) and trampling intensities.The result suggested that if the reduction rate of vegetation cover was controlled under 20%,which the trampling intensity under 220 passes,the vegetation cover of the alpine meadow would not change dramatically in grow th season.