西藏雅鲁藏布江流域典型沙漠区生态修复植物群落物种多样性

为了深入了解和探讨西藏沙化土地治理区的植物群落的结构类型、组织水平和稳定程度，根据西藏雅鲁藏布江河谷沙地山南市全国防沙治沙综合示范区20个样地的调查资料，分析了西藏山南市全国防沙治沙综合示范区植物群落物种多样性特征。结果表明：西藏山南市全国防沙治沙综合示范区的植物有34种，藏沙蒿（Artemisia wellbyi）、花棒（Hedysarum scoparium）、桑（Morus alba）、沙打旺（Astragalus adsurgens）和沙蒿（Artemisia desertorum）占优势地位。综合示范区固沙植被平均盖度为31.6%±13.1%；平均生长高度为41.2±19.9 cm；平均生长密度为4.6±4.7株·m^-2。植物群落物种多样性H指数平均为0.99±0.54；物种多样性D指数平均为2.55±1.37；物种均匀度平均为1.76±0.75。

Species diversity of ecological restoration plant communities in typical desert areas of the Brahmaputra River Basin in Tibet

In order to understand and discuss the structure， organization level and stability about plant communities plant community structure of desertification land control in Tibet， the species diversity is analyzed in Shannan National Comprehensive Demonstration Area for Desertification Control and Prevention in Tibet based on the investigation of 20 sampling plots. The results show that there are 34 species of plants about the Shannan National Comprehensive Demonstration Area of Desertification Control and Prevention in Tibet， among which the dominant species are Artemisia wellbyi， Hedysarum scoparium， Morus alba， Astragalus adsurgens and Artemisia desertorum. In the comprehensive demonstration area， the average coverage， height and density of sand-fixing plants were 31.6%±13.1%，41.2±19.9 cm and 4.6±4.7 plants·m^-2， respectively； the average of Shannon-Winner species diversity indices was 0.99±0.54， the average of Simpson species diversity index was 2.55±1.37， and the average evenness of species was 1.76±0.75.