沙坡头地区不同植被结构对沙地土壤水分的影响

The Effect on Different Vegetation Structure to Soil Water Contents in Shapoto Region

本文利用沙坡头地区人工植被结构的调查结果及与其对应的土壤水分观测数据,分析了不同植被结构对地表水分的影响.结果表明流沙区土壤水分的变化是由浅层至深层逐渐增加,植被区土壤水分由上至下递减明显,并且人工植被区沙层水分随着植被建立时间的延长而线性减少.该地区草本植物对10cm—20cm层的土壤含水量影响较大,灌木主要影响20cm—40cm层的土壤含水量.其中雾冰藜和油蒿对地表水分影响较大.对雾冰藜、油蒿、花棒和小画眉草来说,其密度与土壤含水量呈负相关.

In this paper, based on the investigation result of artificial vegetation structure and observation data about soil water changes, analyzed the different vegetation structure's effect on soil water in sand layers. The result showed that soil water in deeper soil layer obviously increase in flowing sand area but descend in plant areas. And sand water contents linearly decline with ages of vegetation.In this area, herbage has quite an effect on the soil water content in 10-20cm sand layer, and bush effect on 20-40cm layer's. The effect of Bassia dasyphylla and Artemisia ordosica on soil water contents are bigger than others. As the vegetation's density higher, the soil water contents remarkably reduced.