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通过对天津农田土壤含盐量及盐分组成的分析,研究了该区盐渍化农田盐分的组成状况和累积特征。结果表明:与蓟县背景对照土壤相比,东丽、津南和汉沽三区盐渍化农田的盐分组成均呈现很大的差异性;非盐渍化农田盐分呈表层累积特征,含盐量随土壤剖面深度的增加而减小,而盐渍化农田表层呈强烈的洗盐、脱盐现象,底层则呈明显的积盐现象;非盐渍化和盐渍化农田盐分的阴离子组成均以HCO3-为主,而阳离子组成则由无盐渍化农田的以Ca2+为主逐渐过渡到盐渍化农田的以Na+为主;盐渍化农田剖面盐分的空间变异性较强,Na+、Cl-与SO42-均为表层低深层高,且pH、残余碳酸钠(RSC)、钠吸附比(SAR)及碱化度(ESP)也均比非盐渍化农田高,并呈现出盐化和碱化同步发生的特征。
Based on the analysis of soil salinity and salt composition in Tianjin farmland, the composition and accumulation of salinity in the salinized farmland were studied. The results showed that the salt content of salinized farmland in Toray, Jinnan and Hangu all showed great difference compared with the control soil in Jixian County. The salt content of non-salinized farmland showed the characteristics of surface accumulation, While the depth of the profile decreases, while the salinization farmland surface was strongly washed salt, desalination phenomenon, the bottom was significant salt accumulation phenomenon; the non-salinization and salinization of salt farm salt composition HCO3- While the composition of cations is dominated by Na +. The Na +, Cl- and SO42- are the main components of salt content in the salinized farmland. However, All of them were low surface layer, and pH, residual sodium carbonate (RSC), sodium adsorption ratio (SAR) and alkalization degree (ESP) were also higher than non-salinization farmland, and salinization and alkalization occurred simultaneously Characteristics.