三角洲平原水库堤坝土壤水和可溶性盐空间分布特征

以辽宁省大洼县三角洲平原水库坝体不同坡向、坡位、剖面深度的土壤为研究对象,分析了土壤含水率和可溶性盐总量在水平空间与垂直空间上的变异与分布特征。结果表明:与含水率相比,土壤可溶性盐总量的变异相对较高;二者均为中等变异性且变异性的趋势较一致。坝体南坡土壤的平均可溶性盐总量、平均含水率均大于北坡。不同土层之间平均可溶性盐总量从大到小的顺序为:中层>下层>表层;而平均含水率随土壤剖面深度增加而增加。不同坡位间可溶性盐总量没有显著性差异;上坡位与中坡位的平均含水率基本持平,下坡位最高。研究结果可为辽河三角洲地区平原水库堤坝及其周边盐碱土治理与植被恢复提供依据。

Spatial distribution characteristics of soil moisture and soluble salt contents on the reservoir dam of Sanjiaozhou plain in Dawa County of Liaoning Province, Northeast China

This paper studied the horizontal and vertical variation and distribution of soil moisture and total soluble salt contents on the reservoir dam of Sanjiaozhou plain in Dawa of Liaoning at different slope aspect and position and different soil depth.As compared with soil moisture content,soil total soluble salt content had a greater variability.Both the soil moisture content and the soil total soluble salt content showed a moderate variability,and their variability was tended to be unanimous.The average soil total soluble salt content was higher on south-facing slope than on north-facing slope,while the average soil moisture content was in adverse.The average total soluble salt content in different soil layers was decreased in the order of middle layer > lower layer > surface layer,while the average soil moisture content was increased with increasing depth.There was no significant difference in the soil total soluble salt content among different slope positions.The average soil moisture content was higher on lower slope than on upper and middle slopes,but had no significant difference between upper and middle slopes.These results provided a reference for the control of saline-alkali soil and the rehabilitation of vegetation on the reservoir dam in Liaohe Delta plain and its surrounding areas.