关键词: 蒸发蒸腾, 退化群落, 恒稳阶段

Abstract: The evaporation and transpiration of the steppe communities is a complex problem influenced by many factors.On the natural Leymus chinensis steppe,the paper substituted time gradients of deteriorated succession with centralwards gradients of grazing on different plots of grazing intensity,and further studied the regularity of community evaporation and community transpiration of the steppe by measuring soil column.The results are as follows:Community evaporation increases and community transpiration decreases with biomass and cover of community falling down when grazing intensity rises,but the decrease of community evapotranspiration is not obvious.Simultaneously,community T/ET is steady relatively from the no degraded plot(N) to the over-degraded plot(O) on the deteriorated succession series of Leymus chinensis steppe.So community T/ET from the gradient N to the gradient O can be called T/ET stability phase.

Key words: evapotranspiration, deteriorated series of community, stability phase