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研究长期不同施肥处理蔬菜保护地土壤的磷素释放特征,结果表明:(1)释磷过程分为快速和慢速释放两个阶段,在24小时内快速释磷,释磷量达整个释放的75%。施用同种化肥情况下,施有机肥组土样的释磷量和释磷率明显大于不施有机肥组;施用同种有机肥情况下,施磷肥土样的释磷量和释磷率都大于不施磷肥的土样。(2)释磷过程遵循两个以上的一级动力学方程,二级动力学方程不太适宜拟合磷素的释放。Elovich、双常数和抛物线扩散方程都能非常好地描述磷素释放过程,其中Elovich方程最好,其次为双常数方程。(3)抛物线扩散方程的扩散系数“R”与Elovich方程的“1/β”和双常数方程的“ab”之间极显著正相关,说明扩散作用是影响长期不同施肥处理蔬菜保护地土壤磷素释放的一个重要机制。(4)从相关分析结果来看,影响长期不同施肥处理蔬菜保护地土壤释磷能力的因子主要是有机质、CEC和全磷含量,而粘粒含量与动力学参数呈正相关但显著性不明显,pH值和活性铁铝含量对它的影响不明显。
The results showed that: (1) Phosphorus releasing process was divided into two stages, rapid and slow release, and the rapid release of phosphorus within 24 hours, the release of phosphorus up to the entire release 75%. Under the condition of applying the same kind of fertilizers, the amount of phosphorus released and the rate of releasing phosphorus in soil samples with organic manure were obviously higher than those without organic manure. Under the same organic manure application, Greater than the non-phosphate soil samples. (2) Phosphorus release follows more than two first-order kinetic equations, and the second-order kinetic equation is not suitable for fitting the release of phosphorus. Elovich, both the bi-constant and the parabolic diffusion equations, describe the release of phosphorus very well, with the Elovich equation the best and the bivariate constant second. (3) The diffusion coefficient “R” of parabolic diffusion equation has a very significant positive correlation with the “1 / β” of Elovich equation and the “ab ” of the bivariate equation, indicating that the diffusion is the effect of long-term different fertilization An Important Mechanism for Handling Phosphorus Release from Soil in Protected Vegetable Areas. (4) According to the result of correlation analysis, the main factors that affect the ability of releasing phosphorus in soils with long-term fertilization were soil organic matter, CEC and total phosphorus, while the clay content was positively correlated with kinetic parameters but not significant, The effect of pH value and active iron-aluminum content is not obvious.