外源低分子量有机酸对土壤钙、磷释放动力学特性的影响

发布时间：2018-05-15 02:09

本文选题：低分子量有机酸 + 钙　；参考：《北方园艺》2016年23期

【摘要】：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。
[Abstract]:The effects of different concentrations of exogenous low molecular weight organic acids (oxalic acid, citric acid) on the release kinetics of calcium and phosphorus in cinnamon soils with relatively high calcium content were studied by using batch constant temperature oscillation method. The results showed that both oxalic acid and citric acid could promote the release of calcium from soil. With the increase of organic acid concentration, the release of calcium gradually increased, and the activation ability was citric acid oxalate, and oxalic acid promoted the release of phosphorus in soil. Low concentration of citric acid inhibited phosphorus release, but with the increase of oxalic acid and citric acid concentration, phosphorus release increased gradually, and the effect of citric acid on phosphorus release in soil was citric acid oxalate. The addition of oxalic acid and citric acid to promote the release of calcium in soil inhibited the release of phosphorus, whereas promoted the release of phosphorus in soil. The effects of exogenous low molecular weight organic acids on the release process of calcium and phosphorus in soil could be well fitted by Langmiur equation.
【作者单位】：沈阳农业大学土地与环境学院;
【基金】：国家自然科学基金资助项目(41401323) 辽宁省自然科学基金资助项目(2014027010)
【分类号】：S153.6

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