以棕红壤为对象，采用等温平衡吸附法，研究了不同有机酸种类和浓度对土壤磷吸附的影响。结果表明：不同种类的有机酸、其功能基（－ＣＯＯＨ，－ＯＨ）数目多的对降低土壤吸磷量的影响大，供试五种有机酸的影响大小顺序为：柠檬酸＞草酸＞酒石酸＞苯甲酸＞乙酸；在同一ｐＨ下，随加入有机酸浓度的升高，土壤吸磷量减少；有机酸与磷的不同加入方式对磷吸附量的影响也不同，先吸附磷后再加入有机酸的吸磷量最大，吸附有机酸后离心弃去有机酸液再加入磷的吸磷量次之，吸附有机酸后再加入磷的吸磷量最小。 Taking the red and brown soil as the object, the isothermal equilibrium adsorption method was used to study the effects of different organic acids and their concentrations on the phosphorus adsorption. The results showed that the effect of five organic acids with different functional groups (-COOH, -OH) on soil P uptake was significant. The order of the five organic acids was citric acid> oxalic acid> tartaric acid > Benzoic acid> acetic acid. Under the same pH, phosphorus uptake decreased with the increase of organic acid concentration. Different addition of organic acids and phosphorus had different effects on phosphorus uptake. After the first adsorption of phosphorus, organic phosphorus The amount of phosphorus uptake by acid was the largest. After organic acid was adsorbed, the organic acid was discarded by centrifugation and the phosphorus uptake was followed by the amount of phosphorus uptake.