关键词: 高寒草甸, 稳定性, 草毡表层, 阈值, 干扰

Abstract: The Alpine Kobresia Meadow Ecosystems at the different stage of degradation in the Haibei Alpine Meadow Ecosystems Research Station and the Three Rivers Source Region were studied to reveal the plant communities,surface conditions,mattic peipedon thickness,roots and soil ratio,and moisture saturation ratio,so as to distinct the system stability and its self-maintaining mechanism in the course of the degradation in alpine meadow.The results showed that the alpine Kobresia meadow system had performed special mechanism to maintain its stability in the long-term evolution process although it had a simple structure.So it could bear the man-made interferences and climate fluctuations to some extents,and had higher ability of controlling and resuming system,as it maintained its system stability through lowing,villiform and mattic growth.But the alpine Kobresia meadow system had a very bad recovering ability after the system destroyed.Nowadays,the reason for the degeneration of alpine meadow in large areas was that the carrying capacity endowed by human had exceeded the capability threshold.

Key words: Alpine meadow, Alpine meadow, Stability, Mattic peipedon, Threshold, Intergerence