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对青海湖湖东克土沙区的土壤水分变化特征及其与降雨之间的关系进行了分析,结果表明:固定沙丘土壤水分随深度的变化较小,采取措施(人工植被+麦草方格沙障)的流动沙丘在不同深度上的变异最大;从0—80cm平均水平看,土壤含水量为固定沙丘>流动沙丘>采取措施的流动沙丘;三种沙丘土壤水分与降雨的时间变化都基本一致,可以分为冻结滞水期(12月—翌年3月)、水分补偿期(4—7月)和失水期(8—11月)三个阶段,土壤含水量以夏秋季最高;降水对0—80cm的土壤水分都有影响,对上层土壤的影响更显著,采取措施的流动沙丘主要影响深度为60cm,固定沙丘为20cm;在流动沙丘上种植人工植被以及布设麦草方格沙障,可以抑制表层土壤水分蒸发,提高表层土壤含水量,在植被恢复前能够有效减少风蚀,对于植物初期生长具有积极意义。
The characteristics of soil moisture change and its relationship with rainfall in Dongkisha area of Qinghai Lake were analyzed. The results showed that the variation of soil moisture with depth in the fixed dunes was small, and the measures (artificial vegetation + Barrier) of the mobile dunes at different depths of the maximum variation; from 0-80cm average level, the soil moisture is fixed dunes> mobile dunes> to take measures of the flow dunes; soil moisture and rainfall of the three types of time changes are basically the same , Which can be divided into three stages of frozen stagnant period (December-March next year), water compensation period (April-July) and water loss period (August-November), and soil moisture content is the highest in summer and autumn; 0-80cm soil moisture have an impact on the upper soil more significant impact of the measures to take the flow of sand dunes mainly affect the depth of 60cm, fixed sand dune 20cm; planting artificial vegetation in the mobile sand dune and the laying of wheat straw grid barrier, you can Inhibit the evaporation of surface soil moisture, improve the surface soil moisture, before the restoration of vegetation can effectively reduce wind erosion, for the initial growth of plants has a positive meaning.