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采用连续液流法测定了五种土壤吸附、解吸ＮＨ４＋的动力学性质。研究表明：（１）ＮＨ４＋吸附、解吸平衡时间及反应速率，平衡时的吸附、解吸量及吸附平衡常数均随土壤粘粒和ＣＥＣ不同而变化；（２）不同动力学模型及同一模型对不同土壤的拟合性不同。ＮＨ４＋吸附、解吸反应的最佳模型分别为一级反应方程及Ｅｌｏｖｉｃｈ方程；（３）ＮＨ４＋穿过水膜的扩散速度控制ＮＨ４＋的吸附一解吸速率；（４）升高温度ＮＨ４＋解吸明显加快。
The kinetic properties of NH4 + adsorption and desorption in five kinds of soils were determined by continuous flow method. The results show that: (1) NH4 + adsorption and desorption equilibrium time and reaction rate, the equilibrium adsorption and desorption amounts and adsorption equilibrium constant vary with soil clay and CEC; (2) Different kinetic model and the same model of different Soil fit is different. The best model of NH4 + adsorption and desorption reaction are the first-order reaction equation and the Elovich equation respectively. (3) The diffusion rate of NH4 + across the water film controls the desorption rate of NH4 +. (4) The desorption rate of NH4 + increases obviously at elevated temperature.