青海湖流域人工治沙措施防风固沙效益初步研究

青海湖流域土地沙漠化现象日趋严重，防治土地沙漠化的工作刻不容缓。本文通过野 外实验、室内分析，以粗糙度、风沙流结构、输沙率等为指标，评估了人工治沙措施在青海湖 流域沙区的防风固沙效益。采取人工治理措施设置麦草方格沙障，配合种植沙棘（Hippophae rhamnoides）以或乌柳（Salix cheilophila）、沙棘间种，起到了明显的防风固沙效果。采取人工 治理措施的样地，近地表风速降低，粗糙度变大，输沙量减少，风沙流结构改变。

Effects of artificial measures on wind-breaking and sand-fixation in Qinghai Lake drainage area

It is imperative to prevent the detrimental phenomenon for increasingly desertification in Qinghai Lake drainage area. In this paper, the benefi ts of vegetation measure on wind-breaking and sandfi xation in Qinghai Lake drainage area are valued through fi eld testing and laboratory analysis. Planting Hippophae rhamnoides only or planting both Salix cheilophila and Hippophae rhamnoides after setting up the straw sand barrier could reduce wind speed and control sand move. The test sites with artifi cial measures make the near-surface wind speed decreased, the roughness becomes larger, the sediment discharge reduced and the wind-sand fl ow change.