Changes of Vegetation Characteristics in Alpine Meadow-steppe of Eastern Qilian Mountains After Different Grazing Rest Modes

English Abstract

Effects of different grazing rest modes onplant community characteristics and underground biomass of alpine meadow-steppe were investigated in Eastern Qilian Mountains. The three grazing treatments were traditional grazing(TG), grazing resting rowing stage (RG) and non-grazing(NG). The results indicated that the height of gramineous, leguminous, sedge and forbs plant functional groups increased, above ground and below ground biomass of gramineous plants, and the dominant gramineous plant important values of Elymus nutans were all increased with grazing ceasing of RG or NG, especially obvious with NG. However, the important values and the ratio in above ground and under ground community biomass of forbs were all decreased. The Shannon-Wiener index(H), Pielou evenness index(J), richness index(S) and total density of plant community are in an order of NG