农业机械学报2011，Vol.42Issue(5)：92-99,8.
设施灌溉条件下不同次生盐渍化土壤盐分离子迁移特征
Effects of Salt Ions Transport on Different Levels of Secondary Salinization Soil under Greenhouse Irrigation
摘要
Abstract
The salt ions distribution at different levels of secondary salinization of greenhouse soil under the same irrigation was investigated through soil columns in lab. The results were as follows; Ca2+ and N03~ were showed "double peaks" feature on the distribution profile in the irrigation of 5 ~ 15 d. With the increased level of secondary salinization, Ca2+ and NO3~ were leached more slowly while the return of salt time later. Migration of groundwater on the K + had no significant effect. The K * ions showed a " single peak" feature on the distribution profile after irrigation. The SO2" was difficult to be leached out of topsoil under all the degree of secondary salinzation. Factors from the environmental perspective, Ca + in the soil surface and bottom were prominent with a good coupling effect of air temperature, soil moisture content and soil salt content, and both of the Ca2+ transport had a synergistic effect. K* transport in 0 ~ 20 cm soil layers affected mainly by water, while the 30 ~ 50 cm soil layers mainly influenced by temperature, the time from the irrigation point of view, in 5 ~ 15 d after irrigation affected by temperature, but after 20 d affected mainly by water, while the 30 ~ 50 cm soil layer mainly influenced by temperature, the time from the irrigation point of view, in 5 ~ 15 d after irrigation affected by temperature, but 20 d after irrigation affected mainly by water. Whether from the soil or the time, NO3 and SO2" transport was influenced mainly by water.关键词
设施土壤/水盐运移/水热耦合/次生盐渍化Key words
Greenhouse soil/ Water and salt transport/ Water heat coupling/ Secondary salinzation分类
农业科技引用本文复制引用
李卫,郑子成,李廷轩,余海英,曾礼..设施灌溉条件下不同次生盐渍化土壤盐分离子迁移特征[J].农业机械学报,2011,42(5):92-99,8.基金项目
国家自然科学基金资助项目(40901138) （40901138）
