土壤密实度对单点源入渗土壤水分再分布影响研究  

Investigation on effects of soil compactness on soil water redistribution unde point source infiltration condition

作　　者：王海宇 张月珍 董平国 WANG Haiyu;ZHANG Yuezhen;DONG Pingguo(SongTao Temple Flow Station in Wuwei City ,Wuwei 733000,China;Key Irrigation Experimental Station in Wuwei City,Wuwei 733000,China;Integrated Service Centre on Water Conservancy Technologies in Wuwei City,Wuwei 733000,China)

机构地区：[1]甘肃省武威市松涛寺测流站,武威733000 [2]甘肃省武威市中心灌溉试验站,武威733000 [3]甘肃省武威市水利技术综合服务中心,武威733000

出　　处：《干旱区资源与环境》2019年第2期146-151,共6页Journal of Arid Land Resources and Environment

基　　金：甘肃省水利重点科研计划项目(2015128)资助

摘　　要：滴灌点源供水条件下土壤入渗湿润体变化特征值及其影响因素的研究,是正确设计滴灌系统和对田间作物水分进行高水平管理的前提和基础。文中通过田间膜下滴灌单点源入渗试验,运用AUTOCAD和SURFER软件分析研究土壤密实度对滴灌点源入渗结束24h后湿润体特征值及水分分布规律的影响。结果表明,单点源湿润体特征值随土壤密实度的增大,水平方向距离增大的幅度要比垂向大;水平方向湿润体土壤剖面含水率与水平距离呈二次函数关系,相关系数均为0. 95以上,垂直方向湿润体土壤剖面含水率与垂直距离呈线性函数关系,相关系数均为0. 97以上;土壤密实度的大小对土壤水分再分布后的土壤含水率等值线的疏密程度产生影响,此结论将对下一步研究复杂的双点源交汇入渗以及滴灌点源入渗参数预测模型有理论指导意义。under the water supply condition of the point source of drip irrigation,the research ahout the characteristic value changes and its influencing factors of soil infiltration of wetting body is the premise and foundation of high level of correct design of drip irrigation system and field moisture management for the crops. Single point source soil infiltration test was conducted under membrane drip irrigation in the field;by using AUTOCAD and SURFER software,the change rule and moisture distribution about characteristic value of wetting body under membrane drip irrigation were analyzed in the condition of different soil compaction after trickle irrigation for24 h. The results indicated that the characteristic value of wet body increases with the increase of soil compaction,but the magnitude of the horizontal distance is bigger than vertical;moisture content in horizontal soil profile of wetting body is a quadratic function in relation with the horizontal distance;correlation coefficient is above0. 95;in vertical direction moisture content of soil profile of the wet body and vertical distance is a linear function relation,the correlation coefficient is above 0. 97. The soil compaction has impact on soil moisture content contour after soil moisture redistribution,that has theoretical guidance meaning to the next study on the complex double point intersection infiltration and infiltration parameters prediction model ofpoint source drip irrigation.

关 键 词：土壤密实度 点源入渗 湿润体特征值 土壤含水率 水分再分布 

分 类 号：S152[农业科学—土壤学]