压力水头对微润灌土壤水分运动特性影响的试验研究  

Effects of Hydraulic Head on Soil Water Movement under Moistube-irrigation

作　　者：薛万来[1,2] 牛文全[1,2,3] 张俊[1,2] 吴泽广[4] 罗春艳[4] 

机构地区：[1]中国科学院水利部水土保持研究所,陕西杨凌712100 [2]中国科学院大学,北京100049 [3]西北农林科技大学水土保持研究所,陕西杨凌712100 [4]西北农林科技大学水利与建筑工程学院,陕西杨凌712100

出　　处：《灌溉排水学报》2013年第6期7-11,共5页Journal of Irrigation and Drainage

基　　金：国家高技术研究发展技术(863计划)(2011AA100507)

摘　　要：基于室内土箱模拟试验,分析了4种压力水头下土壤水分运动特性。结果表明,土壤累积入渗量与压力水头正相关,且土体微润带入渗量大于空气中;湿润锋运移距离随压力水头增大而增加,不同压力水头下湿润体横剖面都近似为"圆形",且湿润锋运移速率初期较快,后期逐渐变慢;土壤含水率最大值均出现在微润带附近,且压力水头越大,土壤水分分布范围越广,土壤平均含水率越高。A simulated experiment was performed to study effects of hydraulic head on soil water movement under moistube-irrigation. Results showed that cumulative infiltration was positively correlated with the hydraulic head; infiltration of buried way was greater than that of surface. Wetting front distance in- creased with increasing hydraulic head, and cross-section of wet body was similar to ＂round＂; The rate of wetting front was rapid initially, and gradually slowed down later. The top of soil moisture appeared near the moistube and the greater the hydraulic head higher the average soil moisture content. , the wider the range of soil moisture distribution ,and the higher the average soil moisture content.

关 键 词：微润灌溉 水分运动 压力水头 

分 类 号：S152.7[农业科学—土壤学]