Effects of groundwater table on soil solute (Br－) transport
2007
Cao Hongxia | Kang Shaozhong | Shi Xueshuang
chinois. 为了阐明地下水埋深对土壤溶质运移的影响，通过室内均质土柱试验，以Br－为示踪剂，对90 mm 和45 mm两种次灌水量下，1.7，1.2和0.8 m地下水埋深土壤中表施溶质Br－的运移规律进行了研究。结果表明，土表Br－聚集趋势均随地下水埋深增大而增强；随灌水次数增加，土表Br－向下淋移趋势随水位加深而减缓；较浅的地下水埋深有利于土壤溶质（Br－）向下运移；随次灌水量的增加，土表溶质聚集减弱，土壤溶质向下迁移加快。即较浅的地下水埋深和较大的次灌水量能促进土壤溶质向下迁移，减弱其在土表的聚集。
Afficher plus [+] Moins [-]anglais. In order to clarify the effect of groundwater table depth on soil solute transport, solute (Br－) transport in soils with 1.7, 1.2 and 0.8 m groundwater table (GWT) under 90 mm and 45 mm irrigation amount per time was investigated through disturbed soil columns by using tracer Br－ in lab. Results show the tendency of accumulation for Br－ at soil surface strengthens as GWT deepens. The trend of transport downward for soil solute (Br－) at soil surface is abated with bigger GWT as irrigation times increase. The shallower GWT favors the downward movement of soil solute (Br－). The congregation of soil solute at soil surface is abated and transport downward is quickened as irrigation amount per time is augmented. Namely, the shallower GWT and more irrigation amount per time promote downward transport of soil solute, and weaken aggregation of soil solute at soil surface.
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