Influence of yak dung collection on characteristics and productivity of plant functional group of alpine meadow The study on Seed Rain Change of Stipa grandis Community in the Songnen Plain of China Comparison of leaf calorific values in subtropical evergreen broad-leaved and warm temperate deciduous broad-leaved forests in China The Dynamics of Biomass and the Allocation of Energy in Alpine Kobresia Meadow Communities, Haibei Region of Qinghai Province Correlation between Growing Character of Main Species and Ground Temperature in Kobresia Meadow Optimized Grazing Intensity of Yak in Alpine Kobresia parva Meadow