【摘要】 选择我国华北农田一种典型钙质土壤－草甸褐土，在实验室运用水静态浸提方法研究了对于不同的磷加入量，土壤磷在不同振荡时间（ｔ）和不同水土比（Ｗ）条件下的解吸动力学过程．结果表明，在一定的水土比条件下，土壤通过解吸释放的磷与振荡时间呈指数关系；在一定的振荡时间条件下，磷的解吸与水土比也呈指数关系；在一定的振荡时间和水土比条件下，磷的解吸与土壤初始可浸提磷量成正比．通过实验，建立了一个简单的经验模型：ｐ_ｄ＝０．３３Ｐ_０ｔ+（０．０９）Ｗ+（０．２８），描述磷的解吸过程，并给出了该模型的条件范围．更多还原

【Abstract】 The desorption kinetics of phosphorus （P） horn calcareous soil （meadow drab soil） in Northern China was investigated at different P additions, shaking times （t） and water/soil ratios（W）, so that the results could be related to P release from agricultural soil runoff water. The Values of different KH₂PO₄ were added to calcareous soil. Soluble P in different W was measured by Murphy and Riley after a series of t. Sodium bicarbonate-extractable P was determined at each P addition. The results showed that P released was exponentially related to t at any given W, and to W at any given t. The amount of P released was directly proportional to the amount of initial-extractable P in soil at any given W and t. A simple empirical model was developed to describe the desorption kinetics of P in soil,i.e.P_d = 0.33P₀ t⁰.33p₀t⁰.09W⁰.28;and the range of the model was also given.更多还原