Cl^-随水分在不同体积质量红壤中的迁移特性及再分布  

Infiltration Characteristics and Distribution of the Cl^- in the Red Soil as the Water Flow under Different Density Condition

作　　者：裴青宝[1,2] 赵新宇[2] 张建丰[1] 刘伟佳[1,3] 古鹏飞[2] 梁欣欣[2] 

机构地区：[1]西安理工大学,西安710048 [2]南昌工程学院江西省水工程安全与资源高效利用工程研究中心,南昌330099 [3]江西省水利规划设计院,南昌330020

出　　处：《灌溉排水学报》2016年第10期23-26,51,共5页Journal of Irrigation and Drainage

基　　金：国家自然科学基金项目(51379172);南昌工程学院青年基金项目(2014KJ002);江西省大学生创新创业项目(201311319024);江西省科技厅重点研发计划项目(20151BBF60012)

摘　　要：采用一维垂直入渗法(相同入渗水头、含有相同质量分数的氯离子),研究不同红壤体积质量条件下水分及溶质在红壤中的垂直迁移和再分布规律,记录土柱湿润锋等指标的变化,并测定入渗结束后及24 h后土壤中的土壤含水率及含Cl-量。结果表明,土壤的入渗能力易受到土壤体积质量的影响,相同入渗时间,体积质量越高,湿润距离越小,在入渗500 min后体积质量对入渗率的影响减小,不同体积质量的土壤达到稳定入渗率的时间不同。入渗结束后及再分布24 h后Cl-的质量锋溶质锋面总是滞后于湿润锋,Cl-的向下迁移与水分向下入渗受到体积质量的影响相同;再分布过程中,土壤中的Cl-受到向下运动水分的淋洗。Using one dimensional vertical infiltration, in set of five different red soil bulk density and the condition of water supply （under the condition of the same infiltration water head and the same concentration of chloride）, the changes of wetting front and other indicators of soil column and determining the water content and the content of Cl- in soil after 0 hour and 24 hours infiltration were researched. The results showed that the infiltration capacity of the soil largely was affected by the density of soil. And in the same infiltration period, the higher the density, the smaller the distance in moist, and after 500 minutes infiltration, the influence of bulk density on infil- tration rate was reduced. What＇ s more, if the densities of soil were different, the time which reached the stable infiltration was different. After infiltration and 24 hours redistribution, the concentration peak of Cl- always lagged behind the wetting front, the effect of different density condition on the downward migration of Cl- and downward infiltration of water was the same; in the redistribution process, the content of Cl- in the soil was leached by the downward moving water.

关 键 词：垂直入渗 红壤 土壤水分 氯离子 

分 类 号：S152.7[农业科学—土壤学]