在养分胁迫下，尤其是缺磷条件下，许多植物可通过增加有机酸的分泌，作为其适应机制．讨论了营养胁迫条件下不同生态型植物根系分泌有机酸的种类，分析了不同生态型植物分泌的有机酸种类和数量之间的差异．结果表明，在缺磷条件下植物根系所分泌有机酸的种类和数量与它们所处的土壤环境关系密切．在营养胁迫条件下植物根系分泌的有机酸具有活化土壤磷、微量元素和缓解Ａｌ毒的功能；对有机酸活化土壤养分，解Ａｌ毒可能的作用机制进行了论述 Under nutrient stress, especially under phosphorus deficiency, many plants act as an adaptation mechanism by increasing the secretion of organic acids. The species of organic acids secreted by different ecotype plants under nutrient stress were discussed, and the differences between the types and amounts of organic acids secreted by different ecotypes were analyzed. The results showed that the species and quantity of organic acids secreted by plant roots under phosphorus deficiency were closely related to the soil environment in which they were located. Organic acids secreted by plant roots under nutrient stress have the functions of activating soil phosphorus and trace elements and alleviating Al toxicity. The possible mechanism of organic acids activating soil nutrients and alleviating Al toxicity are also discussed