三种钠盐对石灰性土壤盐化特性的影响

Effect of Three Sodic Salinity on Salinization Characteristic in Limy Soils

以甘肃省秦安县果园石灰性土壤为研究对象,利用室内模拟的方法,探讨了三种钠盐(NaHCO3、NaAc和NaCl)对石灰性土壤盐化特性(全盐、pH、水溶性Na+和交换性Na+)的影响。结果表明,在三种钠盐中,NaHCO3和NaAc对石灰性土壤盐化特性相似,而NaCl对石灰性土壤盐化特性与其不同。土壤全盐、水溶性钠和交换性钠随三种钠盐加入量的增加而增加,土壤pH值随着NaCl加入量的增加而逐渐减小,随着NaHCO3和NaAc加入量的增加而逐渐增大。

The object of study was orchard limy soils in Qin＇an County of Gansu Province, a laboratory simulant experiment was carried out to probe into the effects of three sodic salinity（NaHCO3, NaAc, NaCl）on limy soil salinization characteristic（soil total salt, pH, water-solubility sodium, exchangeable sodium）. The results showed that NaHCO3 and NaAc to limy soil salinization characteristic were similarity, and that NaCl was different from NaHCO3 and NaAc. Soil total salt, water-solubility sodium and exchangeable sodium increased with the increase in concentration of three kinds of sodic salinity. Nevertheless, soil pH decreased with the increase in concentration of NaCl, and increased with the increase in concentration of NaHCO3 and NaAc, respectively.