Species Diversity and Biomass Characteristics of Different Grain-for-green Grasslands in the Northern Region of Qinghai Lake

Plant species diversity,biomass characteristics,and index of grass quality of three different grain-for-green grasslands in the northern region of Qinghai Lake on the Tibetan Plateau were investigated after two years of grain-for-green grassland.Results showed that:(1)planted species Elymus sibiricu,Elymus nutan,Bromus inermi were dominant in the communities;(2)excellent forage biomass was significant(P0.05)increased and thus enhanced community aboveground biomass;(3) the similarity of each converted grassland community and CK was lower;and(4)the index of grassland quality was increased dramatically.