[Objective] The paper was to understand the characteristics of plant communities in three kinds of typical alpine meadows in Haibei Region,Qinghai Province.[Method] The characteristics and diversity of plant communities in typical alpine meadow,including Kobresia humilis,Potentilla fruticose and Kobresia menyuanica,were studied,with Menyuan stud-farm in Haibei region of Qinghai Province as an example.[Result] Results showed that the three kinds of plant communities in alpine meadows presented complex structure; the diversity index had close relationship with the evenness index; there were fewer common species and higher species replacement rate among different alpine meadow communities; the aboveground biomass of K.humilis alpine meadow was 1.62 and 1.69 times of P.fruticose and K.menyuanica meadows,respectively; the underground biomass mainly distributed in the 0-10 cm soil layer,and the vertical spatial distribution structure was " T" type; the aboveground and underground biomass were negatively correlated.[Conclusion]The paper will provide basis for protection and further use of different grassland plant communities in Haibei Region,Qinghai Province.
