Study on Control Index of Plateau Zokor in Alpine Meadow

Plateau zokor of alpine meadow in Tian-zhu County,as a kind of dominat species,causes serous damages.In May,the density of zokor is between 5.2 per hectare and 15.9 per hectare,forage loss until September is 322 kg/hm2.The investigation on zoker density and forage loss demonstrated positive correlation between them,the regression equation is M=5.07X+26.06.By integrated analysis and study,this paper points out that the control index of plateau zokor is 8.3 per hectare of alpine meadow in Tian-zhu County of Gansu Province,and May is proved to be the suitable time for control.