浑善达克沙地黄柳活沙障防风固沙效益的研究

Effects of Living Salix gordejevii Barrier on Wind-breaking and Sand-fixation in Hunshandake Sandland

通过研究浑善达克沙地流动沙地上黄柳活沙障的防风固沙效益,对设置3 a后的不同类型的活沙障进行测定和分析,得出如下结论:沙障设置3 a后,沙地趋于固定,障内植物种类明显增多;设置黄柳活沙障的区域内下垫面粗糙度显著增大,风速明显减弱,而且黄柳网格沙障降低风速的能力较带状沙障强,其顺序为:4 m×4 m黄柳网格沙障(6 m×6 m黄柳网格沙障(间距4 m的黄柳带状沙障(间距6 m的黄柳带状沙障(流沙;当旷野平均风速为7.86 m.s-1时,只有流沙和间距6 m的黄柳带状沙障起沙,其他几类活沙障内均不起沙。

The effect of living Salix gordejevii sand-barrier on the wind-breaking and sand-fixation of moving sand of Hunshandake sandland were investigated. The results were as follows： after the Salix gordejevii being planted for three years, the sandland was tending to be fixed. The species of the vegetation increased obviously, the ground roughness increased and wind-speed slowed down obviously in the area with sand-barrier. The sequence of the barrier sizes corresponding to the sand fixation effects was： 4 m × 4 m〉 6 m×6 m〉4 m〉6 m〉moving sand; When the wind-speed in field was 7.86 m ·s^-1, the sand moving were only occurred in moving sands and 6 m× 6 m Salix gordejevii sand-barrier area, and had not been observed in other types of sand-barrier areas.