【摘要】 对 1 0个不同母质土壤进行生物吸钾试验和化学测定 .结果表明 ,二级动力学方程dkt/dt=k(k0 -kt) 2 可以很好地描述连续提取条件下土壤释钾特性。初始释钾速率与有效钾含量呈极显著正相关 ,与黑麦草生物总量及吸钾总量均呈极显著正相关 .2mol/LHNO3提取的释钾速率相关显著性明显高于氢质树脂法 ,其中 0～ 2h的土壤释钾速率能较好地描述土壤钾的有效性更多还原

【Abstract】 The release rates of soil K under various successive extractions were evaluated by second order kinetic equation and the relationship between the rates and K availability was investigated by the experiment of pot exhaustion. The second order equation could well describe K release from the soil studied. The initial releasing rates of soil K were significantly correlated with the contents of soil available K, biomass of ryegrass, and total K absorbed by the ryegrass. The correlation coefficients evaluated by 2 mol L-1 extraction were higher than those by H-resin extraction. Moreover, the availability of soil K could be well described by the release rates from 0 to 8h, being more favorable by those from 0 to 2h.更多还原