风沙土水分入渗与再分布过程中湿润锋运移试验研究  

Study on the wetting front of water infiltration and soil water redistribution in aeolian sandy soil

作　　者：王永东[1,2] 张宏武[3] 徐新文[1] 李生宇[1] 李应罡[1,2] 孙树国[1,2] 

机构地区：[1]中国科学院新疆生态与地理研究所,乌鲁木齐830011 [2]中国科学院研究生院,北京100039 [3]内蒙古自治区巴彦淖尔市林业科学研究所,巴彦淖尔015000

出　　处：《干旱区资源与环境》2009年第8期190-194,共5页Journal of Arid Land Resources and Environment

基　　金：中国科学院重要方向项目"塔里木沙漠公路防护林工程的生态学基础和区域水资源效应研究";国家自然科学基金项目(40701098)资助

摘　　要：利用室内模拟试验系统,对塔克拉玛干沙漠腹地风沙土在滴灌条件下的水分入渗与水分再分布过程中湿润锋的运动规律进行了模拟试验研究。根据模拟试验描述了风沙土在滴灌条件下水分入渗与再分布情况下湿润体的形状变化,研究了在水平方向上与垂直方向上风沙土的湿润锋推进规律及运动特征,揭示了随着累计入渗量的增加,湿润锋推进过程在入渗初期速率较大,逐渐成减小趋势,并最终达到稳定入渗状态;在土壤水分再分布过程中土壤湿润锋面不断向外部推移,最后达到相对稳定;对风沙土水分入渗及再分布过程中其湿润锋的推进距离与时间做了函数关系拟合,其中乘幂函数关系式拟合最好。Laws of water infiltration and soil water redistribution in aeolian sandy soil were studied through outdoor. soil column simulated experiments. According to the determined result, the text described the shape change of wetted volume in soil water infiltration and soil water redistribution period, and analyzed characteristics and laws of wetting front movement. The results showed that the wetting front movement possesses are gradually fasted in the beginning of water infiltration and become slower in anaphase under the drip irrigation. After stopping irrigating, wetting front is passing to the outside constantly and stable to reach finally. In the end the relation about wetting front distance and time was simulated and it conformed to power function laws.

关 键 词：风沙土 入渗 土壤水分再分布 湿润锋 塔里木沙漠公路防护林 

分 类 号：S152.7[农业科学—土壤学]