沙区微域土壤水分再分布研究

根据水量平衡方程式建立沙区微小区域蒸发估算模型,利用该模型对沙区微域径流区积水区、过渡区、产流区土壤水分入渗与蒸发进行估算,分析降水的微域积水效应,探讨利用沙区微域积水效应进行植被恢复的可行。结果表明:微域径流区积水区表现出明显的积水效应,降水入渗使土壤水分变化较大的深度表现为积水区(100cm)过渡区(80cm)产流区(60cm);对应的水分增量为积水区(15.84%)产流区(12.64)过渡区(10.61%);蒸发量表现为积水区(44.8%)过渡区(35.9%)产流区(25.8%),水分增量、蒸发量及总存水量相关,沙区微域积水区具有良好的积水存水效应,对植被恢复具有重要意义。

A Study on the soil moisture redistribution in micro-scale watershed in sandy area

In order to explore the feasibility for recovering the vegetation by using the water kept in micro-scale watershed in sandy area,the evaporation model for micro-scale watershed was established with water bal-ance equation to estimate the soil moisture infiltration and evaporation in casual water zone,transition zone and runoff zone.The result showed that the soil moisture was significantly increased in casual water zone,and the variation order of soil moisture in different depths caused by rainfall infiltration was 100cm in rainfall precipita-tion zone>80 cm in transition zone>60 cm in runoff area.Soil moisture was increased by 15.84% in the casual water zone,12.64% in the runoff area and 10.61% in the transition area respectively.Soil evaporation order was 44.8% in the casual water zone>35.9% in the transition area>25.8% in the runoff area.The water storage in micro-scale watershed was promising for vegetation restoration.