山地红枣林地滴灌水分运移规律试验研究  

Experimental Study on Water Movement Under Drip Irrigation in Mountain of Jujube

作　　者：杨直毅[1,2] 汪有科[1,3,2] 汪星[3] 宋海燕[3] 汪勇[3] 蒋中波[3] 

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]中国科学院研究生院,北京100049 [3]西北农林科技大学,陕西杨凌712100

出　　处：《水土保持学报》2009年第3期213-216,共4页Journal of Soil and Water Conservation

基　　金：国家重大科技支撑项目(2007BAD88B05)

摘　　要：在米脂山地微灌枣树示范基地研究了一定流量范围、不同灌水量条件下,地表滴灌水分在水平和垂直方向上的运移规律及滴灌结束后的水分再分布特征。试验结果表明：在流量稳定条件下,湿润体的水平和垂直扩散距离均与时间有显著的幂函数关系;在4.6～5.0 L/h的流量范围内,湿润体的水平和垂直扩散距离与灌水量也存在显著的幂函数关系;滴灌停止后24 h内的土壤湿润体扩散很大,湿润体平均含水量降低很快,24 h后的扩散较小,平均含水量下降较小,确定滴灌停止后24 h时的湿润体特征值可作为滴灌系统设计的依据。A series of experiments about the effect of drop water on water movement of soil wetted volume and the course of soil water redistribution under drip irrigation condition, the experiments were carried out under a certain range of flow rate in Jujube demonstration base of mountain micro-irrigation in Mizhi. The resuits showed that the remarkable power function relations were observed between horizontal and vertical wetting fronts and the infiltration time under flow stability. The remarkable power function relations were also observed between horizontal and vertical wetting fronts and the drop water during 4.6 L/h and 5.0 L/h. After the end of drip irrigation, the wetted volume spread a lot and the water content of soil wetted volume reduced much during the next 24 hours. After then, the wetted volume spread less and the water content of soil wetted volume reduced smaller. Therefore, the characteristic values of wetted volume when 24 hours after the end of the drip irrigation can be used as the basis of drip irrigation system design.

关 键 词：滴灌 湿润体特征值 湿润体含水量 灌水量 

分 类 号：S275.6[农业科学—农业水土工程] S152.7[农业科学—农业工程]