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通过野外定位监测试验,对干旱荒漠区灌草植被防风固沙、阻沙效应、风蚀和风沙沉降影响进行了研究,结果表明:灌草植被能显著增加地表粗糙度,是其具有防蚀、阻沙功能的内在机理;随着植被盖度的增加,输沙量、风(积)蚀量、沙尘沉降量均大大下降,固定沙丘、半固定沙丘随植被盖度的增加其输沙量较新垦沙地输沙量分别下降93.6%和59.8%,绝对风蚀量最大月份,固定沙地、半固定沙地绝对风蚀量仅为新垦沙地的32.6%和73.4%;沙尘沉降量的分布表现出共同的规律性,降尘均集中在4—6三个月,4月份最大,为总降尘量的1/4~1/2强,在水平和垂直梯度上各月降尘量差异显著。
Through the field monitoring test, the effects of windbreak and sand-fixation, sand-blocking effect, wind-induced erosion and wind-settling on the shrub-grass vegetation in arid desert were studied. The results showed that the shrub-grass vegetation could significantly increase the surface roughness, The sediment load of sand dune and semi-fixed sand dune increased with the increase of vegetation coverage, while that of sand dune and semi-fixed sand dune was lower than that of the control The sediment discharge of reclamation land decreased by 93.6% and 59.8% respectively. The absolute amount of wind erosion was the largest. The absolute wind erosion of fixed and semi-fixed sandy land was only 32.6% and 73.4% of that of newly reclaimed sandy land. The distribution of dustfall Showing the common regularity. The dust concentration concentrated in 4-6 months and three months, the largest in April, which was 1/4 ~ 1/2 of the total amount of dustfall. There was significant difference in the amount of dustfall in each month on the horizontal and vertical gradients.