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采用氢质阳离子交换树脂连续提取法 ,结合生物吸 K实验 ,探讨了利用零级动力学、一级动力学、Elovich和抛物线模型描述耕作土壤非交换性 K释放效果、释放速率差异及其与非交换性 K有效性的关系 .结果表明 ,利用 Elovich模型拟合土壤非交换性 K释放方程的相关系数为 0 .982 * * - 0 .996 * * ,达极显著水平 ,且非交换性 K累积释放量的模型计算值与实测值间的标准差仅为 1.35- 2 .4 8,而零级、一级和抛物线模型拟合方程的相关系数相对较低 ,标准差则为 Elovich模型的 5- 9倍 .Elovich模型计算的不同时间土壤非交换性 K释放速率与黑麦草非交换性 K吸收量及生物总量呈极显著或显著正相关 ,表明利用 Elovich模型描述耕作土壤非交换性 K释放速率较为理想 .以伊利石为主的土壤非交换性 K释放速率 ,尤其是 2 4 h之前的释放速率 ,明显高于以高岭石或蒙脱石为主的土壤
Using hydrogen cation exchange resin continuous extraction method and bio-absorption K experiment, the zero-order kinetics, first-order kinetics, Elovich and parabola models were used to describe the effect of non-exchangeable K release and the difference of release rate between cultivated soil and non-exchangeable K The results showed that the correlation coefficient of non-exchangeable K release equation was 0.982 * * - 0.996 * * fitted by Elovich model, reaching a significant level, and the non-exchangeable K accumulation The standard deviation between calculated and measured values of release was only 1.35-2.48, while the correlation coefficients of zero-order, first-order and parabolic model fitting equations were relatively low, and the standard deviation was 5- 9 times.The soil non-exchangeable K release rate calculated by Elovich model was significantly or significantly positively correlated with the non-exchangeable K uptake and biomass of ryegrass, indicating that Elovich model was used to describe the release rate of non-exchangeable K The ideal non-exchangeable K release rate of the soil, especially the release rate before 24 h, was significantly higher than that of the kaolinite or montmorillonite-based soil