| In order to find out new solutions for easing the degeneration of alpine meadow in Qinghai Lake basin, we took alpine meadow, which located in Ha Ergai town, Gangcha county, as a case that comparatively studied the different changes of vegetation community characteristics between conventional grazing area and the area where was only grazed before grass turning green and after seed maturing. We used field random quadrat survey to collect grassland data. The results showed that grazing before grass turning green and after seed maturing significantly increased alpine meadow community coverage and aboveground biomass. Meanwhile, grazing time also impacted the associated species composition,which was characterized by the increases of the importance values of excellent pasture, while the grazing resistance varieties were dominantly in conventional grazing area. In addition, grazing time had significant impact on Margalef, but no impact on Shannon-Wiener and Pielou. Obviously, grazing before grass turning green and after seed maturing can ease the degeneration of alpine meadow. |
