Distribution characteristics of soil salinization in the east coastal plain of Cangzhou
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摘要: 土壤盐渍化是沧州沿海地区面临的主要环境地质问题之一。通过采集浅部0.3～0.5 m，深部0.8～1.0 m土壤样品，开展易溶盐试验，研究区域土壤盐分特征，分析各离子间的相关性，评价土壤盐渍化程度与影响因素。结果表明：浅部样品全盐量平均值为4.225 g/kg，高于深部3.828 g/kg。浅部全盐量与Cl-、SO4 2-、Na+、K+含量呈显著正相关。深部土壤全盐量与Cl-、Na+、K+、Mg2+含量显著正相关。土壤盐渍化总体处于低-中等水平，不同层位盐渍土均近似平行于海岸带分布；盐渍化程度呈现自西北向东南逐渐加剧的趋势。盐渍化类型主要为氯盐渍化，NaCl是盐分存在最主要形态。浅层地下水性质与包气带岩性是影响盐分积累最主要的因素。Abstract: Soil salinization is one of the main environmental geological problems in Cangzhou coastal area.By gathering soil samples of 0.3~0.5 m in the shallow layer and 0.8~1.0 m in the deep layer, the soluble salt test was carried out to study the characteristics of soil salt in the region, analyze the correlation among ions, and evaluate the degree of soil salinization and its influencing factors.The research results show that the average total salt content of shallow samples is 4.225 g/kg, which is higher than that of deep samples.The total salt content of shallow soil was positively correlated with the contents of Cl-, SO4 2-, Na+and K+.The total salinity in the depth was positively correlated with the contents of Cl-, Na+, K+and Mg2+.The degree of soil salinization was at low to medium level, and increased gradually from northwest to southeast.The salinized distribution of different layers was almost parallel to the coastal zone.Chlorine salinization is the main type of salinization, and NaCl is the main salt form.The characteristics of shallow groundwater and the lithology of vadose zone are the main factors affecting salt accumulation.
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