作 者：
刘旋旋;董晓华;郭梁锋;孙媛;刘冀;李英海
单 位：
水资源安全保障湖北省协同创新中心;三峡大学水利与环境学院
关键词：
非充分供水;掺砂率;土壤水入渗;再分布;湿润锋
摘 要：
为了给干旱半干旱地区农田蓄水保肥的掺砂制度提供理论支持,本文采用室内模拟降雨土柱试验,在土壤表层设置4个掺砂水平,掺砂率分别为0%(对照)、25%、50%、75%。研究非充分供水条件下,掺砂率对土壤水分入渗及再分布过程影响。研究结果表明:(1)掺砂处理加快了湿润锋推移进程,掺砂率越高,影响效果越明显,并且在掺砂率大于25%时影响幅度较大。(2)掺砂率越高,掺砂层土壤含水率越小,掺砂层以下土层含水率越大、持水性能越好。掺砂率达到50%以上能够取得较好的保水效果。当掺砂率为75%时,30 cm深度处土壤含水率较于不掺砂土壤提高了约40%。(3)在土壤水分的再分布阶段,当掺砂率为75%时,15 cm深度处的土壤含水率最高,30 cm土层深度处的土壤持水性能最好。当土壤表层掺砂率较高时,其最佳蓄水层深度为15～30 cm,可为植物生长提供持续供水。
译 名：
An Experimental Study on Water Infiltration and Redistribution of Surface Soil Mixed with Sand under Non-sufficient Water Supplied
作 者：
LIU Xuan-xuan;DONG Xiao-hua;GUO Liang-feng;SUN Yuan;LIU Ji;LI Ying-hai;College of Hydraulic and Environmental Engineering,Three Gorges University;Water Resources Security Protection Collaborative Innovation Center of Hubei Province;
单 位：
LIU Xuan-xuan%DONG Xiao-hua%GUO Liang-feng%SUN Yuan%LIU Ji%LI Ying-hai%College of Hydraulic and Environmental Engineering,Three Gorges University%Water Resources Security Protection Collaborative Innovation Center of Hubei Province
关键词：
inadequate water supply;;sand mixed rate;;infiltration;;redistribution;;wetting front
摘 要：
In order to provide theoretical support for the sand-mixing system of water storage and fertilizer conservation in arid and semi-arid areas,the experiment used artificial simulation of rainfall indoor to study the effects of sand mixed rate on soil water infiltration and redistribution under inadequate water supply. The soil cylinder incubation treatments were setup including 0( Control),25%,50%,75% of sand mixing rate. The research indicates that:(1) The treatment of sand mixed can speed up the process of wet front movement. The higher the sand mixed rate,the more obvious the effect,and the greater the effect when the sand mixed rate is more than 25%.(2) The higher the sand mixed rate,the smaller the water content in the soil of sand mixed,The greater the water content and the better the water retention below the soil of sand mixed. Sand mixing rate of more than 50% can achieve better water retention. When the sand mixing rate is 75%,the soil moisture content at the depth of 30 cm is increased by about 40% compared with the soil without sand mixing.(3) When the sand mixed rate is 75%,the soil moisture content is the highest at 15 cm depth,and the soil moisture retention is the best at 30 cm depth during the redistribution phase. So when the sand is mixed with a higher rate,the best aquifer is 15 ～ 30 cm. It provides continuous water supply for plant growth.
