The relationship between plant communities of meadow grassland and climaticfactors around north Qinghai Lake

After analyzing the relationship between meadow grassland plant communities characteristics of growth and development of the north shore around Qinghai Lake and climatic factors, to reveal the key climatic factor that impacted the local grassland plant communities characteristics for providing the local a scientific basis to use grassland reasonably, enhance grassland output of unit area and deal with climatic change. The result showed that: the temperature and rainfall of the north shore around Qinghai Lake region appeared a trend that increased year by year, at the same time, associated with the increase of evaporation and decrease of sunshine hours, in the background of the global climate warming year by year. Some biological characteristics of grass changed too, and manifested that the periods of returning green, heading, flowering and seed maturity of grass brought forward, but brown period delayed, and forage height and aboveground biomass appeared a trend that increased year by year. As forages, annual average evaporation mainly affected the height of grass, annual average rainfall greatly impacted the aboveground biomass of forage, and growing season length of the forage were mainly related to the sunshine hours.