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在田间环境的NH4+浓度范围内(10～200mgkg-1),讨论了不同pH、温度和离子强度条件下土壤对NH4+的等温吸附特性,检验了Langmuir方程对吸附的模拟。结果表明,对吸附的影响程度为:离子强度>pH>温度。在离子强度较小、温度和pH适中的情况下土壤对NH4+的吸附最大。pH和离子强度影响吸附的实验结果与吸附理论比较吻合。Langmuir方程最适合描述水稻土对NH4+的等温吸附,其参数与土壤基本性质存在一定相关性,土壤阳离子交换量CEC可作为参数指标。在不同pH、离子强度和温度处理下难以使用更细化的指标来表达和优化吸附参数。
In the field of NH4 + concentration range (10 ~ 200mgkg-1), the isothermal adsorption characteristics of NH4 + under different pH, temperature and ionic strength were discussed. The adsorption of Langmuir equation was simulated. The results show that the degree of adsorption is: ionic strength> pH> temperature. Soil adsorption of NH4 + was the largest under the condition of low ionic strength, moderate temperature and pH. The experimental results of pH and ionic strength that affect the adsorption are in good agreement with the adsorption theory. The Langmuir equation is most suitable for describing isothermal adsorption of NH4 + on paddy soils. The parameters of the Langmuir equation are related to the basic properties of soils. Cation exchange capacity CEC can be used as a parameter index. At different pH, ionic strength and temperature treatments, it is difficult to use finer indices to express and optimize adsorption parameters.