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以含钙相对较高的褐土为试材,采用批量恒温震荡法,研究了添加不同浓度外源低分子量有机酸(草酸、柠檬酸)对土壤钙素和磷素释放动力学特征的影响。结果表明:添加草酸和柠檬酸均可促进土壤中钙素的释放,随着有机酸浓度的增加土壤中钙的释放量逐渐增加,活化能力为草酸<柠檬酸;添加草酸促进了土壤中磷素的释放,低浓度柠檬酸则抑制了磷的释放,但随草酸、柠檬酸浓度的增加,磷的释放量均逐渐增加,对土壤中磷的释放量的影响为草酸>柠檬酸。添加草酸和柠檬酸促进土壤中钙的释放则抑制磷的释放,反之则促进土壤中磷的释放。添加外源低分子量有机酸对土壤中钙、磷释放过程的影响均可用Langmiur方程进行较好的拟合。
The effect of adding different concentrations of exogenous low molecular weight organic acids (oxalic acid and citric acid) on the kinetic characteristics of soil calcium and phosphorus release was studied by using batch constant temperature shaking method. The results showed that the addition of oxalic acid and citric acid could promote the release of calcium in soil. With the increase of organic acid concentration, the release of calcium in soil increased gradually, and the activation ability was oxalic acid citric acid on the release of phosphorus in soil was affected. The addition of oxalic acid and citric acid to promote the release of calcium in the soil inhibits the release of phosphorus, and vice versa to promote the release of phosphorus in the soil. The addition of exogenous low molecular weight organic acids on soil calcium and phosphorus release process can be used Langmiur equation for a good fit.