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本文采用好气培养－间歇淋洗法研究了塿土耕层土壤固定态ＮＨ的释放。实验在恒温下共培养２０周。结果表明，一级扩散动力学方程描述固定态ＮＨ的释放最好，其相关系数ｒ最大，标准误ＳＥ最小。抛物扩散方程也能较好的描述实验数据，表明固定态ＮＨ释放是一扩散控制过程，Ｅｌｏｖｉｃｈ方程的拟合情况和抛物扩散方程相同，零级方程略差，其ＳＥ较大。Ｓ１１和Ｓ１２土样固定态ＮＨ释放速度常数ｋｒ分别是０．１０９７和０．８８３４／周，最大释放ＮＨ是分别为９８．４２和８５．２５ｍｇＮ／ｋｇ，释放ＮＨ半时值分别是６．３２和７．８５周。
In this paper, aerobic culture - intermittent leaching method was used to study the release of fixed-state NH in soil. Experiments were co-cultured at constant temperature for 20 weeks. The results show that the first-order diffusion kinetic equation describes the release of NH in stationary state is the best, the correlation coefficient r is the largest and the standard error SE is the smallest. The parabolic diffusion equation can also describe the experimental data well, which shows that the stationary NH release is a diffusion control process. The fitting of the Elovich equation is the same as the parabolic diffusion equation. The zero-order equation is slightly worse and the SE is larger. The steady-state NH release rate constants of soil samples S11 and S12 were 0.1097 and 0.8834 / week, respectively. The maximum released NH values were 98.42 and 85.25 mgN / kg, respectively, and the released NH values were 6.32 And 7.85 weeks.