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通过对科尔沁沙地不同年龄人工小叶锦鸡儿固沙植被降雨入渗的研究 ,阐明植被对沙地水分入渗的影响。结果表明 ,在降雨量 4 3 4mm ,降雨强度 3 9mm·h-1时 ,降雨后 12 0h内流动沙丘和 5年生人工小叶锦鸡儿植被的水分入渗深度分别为 180cm和 15 0cm ,15年生人工小叶锦鸡儿植被降雨入渗深度为 10 0cm。流动沙丘降雨后土壤水分变化剧烈 ;有植被沙地降雨后土壤水分变化平缓 ,水分下渗浅 .随着植被年龄的增加 ,浅层土壤截留降雨能力不断加强 ,最终形成不透水土层。降雨后短期内流动沙丘浅层土壤中含水量高 ,后期有植被沙丘深层土壤含水量高
Through the study on the infiltration of artificial sand-covered vegetation of Caragana microphylla at different ages in Horqin sandy land, the influence of vegetation on the infiltration of sandy soil was clarified. The results showed that the infiltration depths of flow dunes and Caragana microphylla plants within 180 h after rainfall were respectively 180 cm and 150 cm at a rainfall of 434 mm and a rainfall intensity of 39 mm · h-1. Caragana microphylla vegetation rainfall infiltration depth of 10cm. The change of soil moisture in mobile sand dunes after rainfall was fierce, while the change of soil moisture in the vegetation sand lands was gentle and the water infiltration was shallow.With the increase of vegetation age, the retention of rainfall in shallow soils continued to increase and the impervious soil finally formed. In the short term, the water content in the shallow soil of the mobile sand dunes is high, and the deep soil moisture in the deep layers of the sand dunes in the later period is high