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土壤中磷的移动性、植物有效性和对水体环境的潜在危害性与土壤对磷的吸持反应有关,而铵钾磷共施是农业生产中的普遍现象,因此,本文通过批量培养法,研究了相同摩尔数的氯化铵和氯化钾对磷的吸持动力学的影响,并对磷的吸持动力学进行了不同模型的拟合。结果表明,氯化铵、氯化钾均显著增加了土壤对磷的吸持,在培养初期(5 min),相同摩尔数的氯化铵、氯化钾对磷的吸持量无显著差异,但在15 min～10 d阶段,相同摩尔数的氯化钾对磷吸持量的影响显著大于相同摩尔数的氯化铵。而铵钾共施时,两者对磷的吸持具有协同作用,并主要表现为氯化钾的作用。氯化铵对土壤磷吸持总量无显著影响,氯化钾则显著增加了土壤磷吸持总量,氯化钾和氯化铵处理土壤磷吸收总量则无显著差异。通过比较不同模型拟合的决定系数(R2)大小,不同模型拟合效果顺序为Elovich方程>双常数方程>Parabolic扩散方程>零级方程>一级方程>二级方程。
Phosphorus mobility in soil, plant effectiveness and potential hazard to the water environment are related to the adsorption and desorption of phosphorus by the soil. However, ammonium-potassium-phosphate interaction is a common phenomenon in agricultural production. Therefore, through batch culture method, The effects of the same mole of ammonium chloride and potassium chloride on the adsorption kinetics of phosphorus were studied. Different models of phosphorus adsorption kinetics were fitted. The results showed that both ammonium chloride and potassium chloride significantly increased the uptake of phosphorus by soil. During the initial incubation period (5 min), there was no significant difference in phosphorus uptake between the same molar amount of ammonium chloride and potassium chloride, However, in the period of 15 min-10 d, the same molar amount of potassium chloride had a greater effect on the phosphorus uptake than the same molar amount of ammonium chloride. When ammonium and potassium co-application, both of them have a synergistic effect on the adsorption and desorption of phosphorus, and mainly show the effect of potassium chloride. Ammonium chloride had no significant effect on soil total phosphorus uptake, potassium chloride significantly increased the total amount of soil phosphorus uptake, while no significant difference was found between total phosphorus uptake by soil treated with potassium chloride and ammonium chloride. By comparing the determination coefficients (R2) of different model fitting, the fitting results of different models are Elovich equation> bivariate equation> Parabolic diffusion equation> zero order equation> first order equation> second order equation.