论文部分内容阅读
本研究采用室内模拟的方法,以查明江苏省滨海盐土脱盐过程中pH值上升的原因.模拟试验显示,因CaCO_3的溶解可增加HCO_3-的含量,但增加量的多少,则受溶液中Ca~(2+)浓度的控制.当盐溶液浓度降低、Ca~(2+)含量减少时,HCO_3-含量就增加得多,从而土壤pH值也相应增加.从而证明,在自然条件下江苏滨海盐土因含有石灰,在脱盐过程中pH值上升是由于溶液中Ca~(2+)含量减少,HCO_3-含量增加所致,并非代换钠水介的结果.
In this study, the indoor simulation method was used to find out the reason of the pH value rising during the desalination of coastal saline soil in Jiangsu Province.Mixing experiments showed that the content of HCO_3- increased due to the dissolution of CaCO_3, however, ~ (2+) concentration.When the concentration of salt solution decreased and the content of Ca ~ (2+) decreased, the content of HCO_3 increased much, and the pH value of soil also increased accordingly.Thus, it was proved that under the natural conditions, The content of Ca ~ (2+) decreased and the content of HCO_3 increased due to the inclusion of lime in the salinized soil during the desalting process, which is not the result of sodium substitution.