土壤容重对膜孔灌盐土水盐运移分布影响  

Impact of soil bulk density on distribution of water-salt transport in saline soil under film-hole irrigation

作　　者：程东娟[1] 霍自民[1] 汪丽佳[1] 

机构地区：[1]河北工程大学水电学院,河北邯郸056021

出　　处：《水利水电技术》2013年第1期121-124,共4页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金项目(50579064;50179030);河北省自然科学基金资助项目(C2011402042);河北省教育厅自然科学青年基金(2011161;2011247)

摘　　要：通过室内土壤膜孔灌盐土水分入渗试验,分析了土壤容重对膜孔灌盐土水盐运移分布的影响。结果表明:(1)土壤容重越大,相同入渗时间的累积入渗量越小,相同灌水量下土壤湿润范围越大;(2)入渗结束时,土壤含水量以膜孔为中心呈等值线分布,土壤容重越小,相同位置的土壤含水量越大;(3)膜孔灌对盐土有明显的淋洗作用,膜孔附近土壤盐分含量远低于本底值,湿润体边缘有较高盐分累积;(4)相同灌水量下,土壤容重越小,盐分淋洗范围越大。以上研究结果可以为盐土上膜孔灌合理灌溉提供参考依据。Abstracts： Through the indoor experiment on water infiltration of saline soil under film-hole irrigation, the impact of soil bulk density on the distribution of water-salt transport in saline soil under film-hole irrigation is analyzed herein. The result shows that： （ 1 ） the bigger the soil density, the less the total infiltration amount in the same time and the bigger the wetting scope under the same irrigation amount; （2）after infiltration, the soil water content shows a contour distribution with the film-hole as the center, and then the less the soil bulk density, the bigger the soil water content at the same location; （3）the film-hole irrigation has an obvious leaching effect on saline soil, i. e. the soil salt content near the film-hole is much lower than the background value of it with a higher salt accumulation at the edge of wetting front ; （4） under the same irrigation amount, the less soil salt bulk con- tent, the larger the salt leaching area. On the whole, the study results given above can lay a reference basis for the reasonable ir- rigation on saline soil with the film-hole irrigation.

关 键 词：土壤容重 膜孔灌 盐土 水盐运移分布 

分 类 号：S275.9[农业科学—农业水土工程]