基于Hydrus-2D的负压灌溉水分动态模拟  

Simulation of Soil Water Dynamic Based on Hydrus-2D Under Negative Pressure Irrigation

作　　者：周青云[1] 李松敏[1] 孙书洪[1] 韩娜娜[1] 

机构地区：[1]天津农学院水利工程学院,天津300384

出　　处：《人民黄河》2017年第8期133-136,共4页Yellow River

基　　金：国家自然科学基金资助项目(51609170);国土资源部公益性行业专项(201111015);天津市优秀青年教师资助计划项目(2014-2016);天津农学院科学研究发展基金资助项目(2011N10)

摘　　要：负压灌溉是一种新型的节水灌溉技术,其灌溉过程中无需外界提水加压,利用土壤吸力自动从高程低于灌水器的水源中吸收水分,以补充作物和土壤蒸散发失去的水分。运用Hydrus-2D软件模拟研究土壤质地对负压灌溉水分运移的影响,分别对沙壤、壤土、黏壤土和黏土4种不同土壤质地进行模拟,分析土壤质地对湿润锋、土壤含水量和灌水量三方面的影响。结果表明:沙壤土因土壤含水率较低、水分下渗较快、保水能力差而不适宜采用负压灌溉系统,壤土、黏壤土和黏土保水能力较强,土壤含水率较高,湿润锋分布均匀,较适宜采用负压灌溉系统。Negative pressure irrigation is a new water-saving irrigation technique. There is no external water pressure equipment in the irriga-tion process. Water will be absorbed by soil matric potential automatically from water resource which elevation below to the field. In this pa-per, the effects of soil texture on soil water dynamics under negative pressure irrigation was simulated by Hydrus-2D. The results show that sandy loam with low moisture content, water infiltration and water holding capacity are not suitable for negative pressure irrigation system. Loam and clay loam with high water holding capacity and even wetting front are suitable for negative pressure irrigation system.

关 键 词：负压灌溉 土壤质地 土壤含水率 灌水量 

分 类 号：S275[农业科学—农业水土工程]