吉林省大安市苏打碱土盐化与碱化的关系

选择了76份苏打碱化土壤样品,对其各盐化与碱化指标进行了测定,分析了苏打碱化土壤盐化和碱化的关系.结果表明,土壤的碱化层和高含盐层出现在土壤中同一层次,因此该土壤盐化与碱化过程有密切联系.土壤含盐量与各碱化参数(ESP、SAR、总碱度、RSC和pH)均为正相关.土壤碱化度随含盐量的升高而增大,高盐分浓度对土壤碱化度的抑制作用,至少要在其浓度达到8.0 g/kg以上时才会出现.土壤中Na 、CO32-和HCO3-离子同各碱化参数之间均是极显著相关,同时Cl-离子与除pH外的各碱化参数极显著相关,这是该类型土壤兼有盐化和碱化特征的反映.统计分析表明,各盐分离子中Na 和CO32-离子对ESP的影响作用更大.

Relationship between salinization and alkalization of sodic soil in Da'an City

Salinization and alkalization parameters of sodic soil were measured.Relationship between salinization and alkalization was analyzed.Results show that the natric horizon and salic horizon locates at the same soil layer,which indicates that the relation of salinization to alkalization is close.Correlations between soil salt content and alkalization parameters including exchange sodium percentage(ESP),sodium adsorption ratio(SAR),total alkalinity,residual sodium carbonate(RSC) and pH are all significant.Values of soil ESP become high as soil salt content increases.Soil salt content under 8.0 g/kg accelerates hydrolytic reaction of exchangeable sodium rather than restrains it.Inhibiting effect of soil salt content on exchangeable sodium percentage is apparent when soil salt content exceeds 8.0 g/kg.Correlations between ions including Na ,CO32-,HCO3-and alkalization parameters are very significant.Correlation between Cl-and alkalization parameters except pH is also very significant.This reflects the salinization and alkalization characteristic in sodic soil simultaneously.Na and CO32-ion has a stronger influence on soil ESP than other soil soluble ions.