关键词: 拉萨半干旱河谷, 砂生槐, 生态恢复, 植被特征, 土壤微生物

Abstract: To elucidating characteristics of the Sophora moorcroftiana shrub zonalitical vegetation during the ecological restoration process in the semi-arid valley of Lhasa, we measured the height, coverage, density, vegetation biomass, diversity index and niche breadth of the shrub in different enclosure years (three, six and nine years),used as the typical community of vegetation restoration, and investigated dynamics of microorganism in the soil, including bacteria, actionbacteria and fungi, by using a method of space sequence in place of time sequence. The results showed that the fencing measures increased species diversity and plant characteristics values, and raised the productivity. S. moorcroftiana is constructive species and dominant species in the valley communities and had the largest width of niche health. Artemisia wellbyi is a generalization species with more even distribution. The soil microbial quantity in the community was proportional to the fencing time, indicating that the soil environment had a significant improvement during the fencing recovery process.

Key words: semi-arid valley of Lhasa, Sophora moorcroftiana, ecological restoration, vegetation characteristics, soil microoganisms