干旱区地理2011，Vol.34Issue(6)：919-925,7.
绿洲-沙漠过渡带骆驼刺群落的防风阻沙作用
Effect of Alhagi sparsifolia community on wind block and drift sand control in the oasis-desert ecotone
摘要
Abstract
The oasis-desert ecotone is a special area, the process of oasis desertification or its reversion is mainly depended on the vegetation state there. The Cele oasis-desert ecotone was chosen as the study area and various parameters of Alhagi sparsifoli community were surveyed from April to October of 2009, including phenolphase observation, plant height, crown diameter, coverage, and biomass etc. Gradient wind velocity and wind-blown sand transport were conducted on the bare sand surface and Alhagi sparsifolia community ground as well and the relationships between sand transport quantity and sand drift potential were determined under the two underlayer conditions. The results show that Alhagi sparsifolia plants sprout in early April and grow up rapidly from May to July, just as aeolian sand activities come to the strongest stage in the desert regions of south Xinjiang. From August to October the plants are in a slowly growth stage and mainly carry through their lignification process, which can make the plants keep standing in whole winter. When next spring coming the dead but standing plants still have a well effect on wind block and drift sand control. Compared with the bare sand surface, wind velocity below 60 cm height in the Alhagi sparsifolia ground is decreased by 26% - 67%. Total sand transport quantity on bare sand surface is 6.7 times of that on Alhagi sparsifolia community ground. According to the relationship between sand transport quantity and sand drift potential, we conclude that there are about 170. 24 tons sands intruding into the oasis from its west rim per kilometer for one year, while the existence of Alhagi sparsifolia community with a coverage of 30% can block about 85% of drift sands away from the oasis.关键词
塔干南缘/绿洲-沙漠过渡带/骆驼刺群落/防风阻沙/输沙势Key words
the southern rim of the Taklimakan Desert/ oasis-desert ecotone/ Alhagi sparsifolia community/ windblown sand control/ sand drift potential分类
农业科技引用本文复制引用
王雪芹,胡永锋,杨东亮,郭洪旭,杨帆,张忠良..绿洲-沙漠过渡带骆驼刺群落的防风阻沙作用[J].干旱区地理,2011,34(6):919-925,7.基金项目
国家重点基础研究发展计划(2009CB421303)和新疆科技重大专项(200733144-2)资助 （2009CB421303）
