泥沙级配对浑水灌溉下土壤水分增长过程的影响分析  

Influence of Different Sediment Gradations on Increasing Process of Soil Moisture Content Under Muddy Water Irrigation

作　　者：卞艳丽[1,2,3] 曹惠提[1,2,3] 张会敏[1,2,3] 王军涛[1,2,3] 

机构地区：[1]黄河水利科学研究院,郑州450003 [2]黄河流域农村水利研究中心,河南新乡453003 [3]黄河流域灌溉试验中心站,河南新乡453003

出　　处：《节水灌溉》2016年第7期23-30,35,共9页Water Saving Irrigation

基　　金：国家重点基础研究发展计划("973"计划)项目(2011CB403303);十二五国家科技支撑计划(2012BAD08B05);黄河水利科学研究院中央级公益性科研院所基本科研业务费专项(HKY-JBYW-2013-11;HKY-JBYW-2012-01)

摘　　要：通过在测坑中开展灌溉条件下2种含沙量4种泥沙级配组合下的浑水灌溉入渗试验,发现泥沙级配对土壤水分增长过程的影响显著:泥沙级配越细,相同灌溉入渗历时的累积入渗量和土壤含水量的增加量越小,与清水灌溉试验结果的差异性越大。同一含沙量浑水灌溉,泥沙级配越细,不同深度土壤含水量始变历时和增长拐点历时更长;同一泥沙级配浑水灌溉,含沙量越大,不同深度土壤含水量始变历时和增长拐点历时更长。相同入渗历时,浑水灌溉下的累积入渗量和土壤含水量变化量均较清水灌溉的小,土壤水分增长较清水缓慢;由于浑水中泥沙的阻渗和减渗作用,同一含沙量条件下,泥沙级配越细,灌水后相同入渗历时的土壤含水量变化量和累积入渗量越小;同一泥沙级配浑水,含沙量越大,灌水后相同入渗历时的土壤含水量变化量和累积入渗量越小。Through the infiltration experiment of muddy water irrigation under combinations of two sediment concentrations and four different sediment gradations,it has been found that sediment particle sizes affect the growth process of soil moisture significantly.The smaller the sizes of sediment particles in muddy water,the smaller their accumulative infiltration capacity and increased content of soil moisture,and the more differences with the results of clean water irrigation test.For muddy water irrigation with the same sediment concentration,the finer sediment gradation is,the longer the first variable time and the time of growth inflection point of soil moisture in different depth are;For muddy water irrigation with the same sediment gradation,the bigger sediment concentration is,the longer the first variable time and the time of growth inflection point of soil moisture in different depth are.Under the same infiltration time,the cumulative infiltration amount and the soil moisture variation of muddy water irrigation are relatively smaller than those of clean water irrigation,the soil moisture increases slowly than under clean water.Because of the effect of sediment in muddy water,under the condition of the same sediment concentration,the finer sediment gradation is,the smaller the variation of soil moisture content and the cumulative infiltration amount are;under the condition of the same sediment gradation,the bigger sediment concentration is,the smaller the variation of soil moisture content and cumulative infiltration amount are.

关 键 词：浑水灌溉 泥沙级配 土壤含水量 累积入渗量 含沙量 

分 类 号：S152.7[农业科学—土壤学]