浅埋深地下水作用下苏打盐渍土水分动态变化特征

文章利用野外试验设施分别把地下水埋深控制在1.0,1.4,1.8,2.2和2.5m,研究在不同地下水埋深作用下苏打盐渍土土壤水分平衡和水分动态变化。同时,跟踪在地下水位不断波动条件下田间土壤水分的动态变化。结果表明:地下水埋深在1.0~2.5m时,苏打盐渍土土壤水和地下水的转化关系非常微弱,仅在长期干旱的条件下发生微量地下水毛细上升量;降雨和蒸散作用对苏打盐渍土体积含水量的影响深度不超过40cm,埋深大于1.0m的潜水对0~80cm深度苏打盐渍土体积含水量变化没有明显影响。

Water balance and temporal variation in water content in alkaline sodic soils with shallow water table

Soil salinization is an increasing cute problem in the Songnen plain.It is necessary to determine groundwater effect on soil salinization for salt-affected soil reclamation.With an experimental facility,the authors investigated soil water balance and temporal variation in soil water content with shallow water table of 1.0,1.4,1.8,2.2 and 2.5 m in depth.Temporal patterns of soil water content in the field were also investigated during the period.Results show that water exchange between groundwater and soil water was slight with water table greater than 1.0 m in depth.The effective soil depth affected by rainfall and evapotranspiration did not exceed 40 cm in depth.Groundwater had little effect on soil water content at depths ranging from 0 to 80 cm.