利用藻类生长潜力测试方法（ＡＧＰ试验），在太湖五里湖区水样中分别添加不同浓度轻、中、重３种稀土元素（Ｌａ（Ⅲ）、Ｇｄ（Ⅲ）、Ｙ（Ⅲ））与３种稀土混合物，研究稀土元素对富营养化水体中藻类增长的影响．结果表明，在本试验条件下，单独添加Ｌａ、Ｇｄ和Ｙ在低浓度水平（０．２ｍｇ／Ｌ）能显著促进羊角月芽藻的增长，而添加混合稀土元素无明显的促长作用．在单独添加３种稀土元素和混合稀土的同时添加磷（ＨＰＯ２－４，０．０４ｍｇ／Ｌ），仅轻稀土Ｌａ在０．２ｍｇ／Ｌ水平上表现了与磷对羊角月芽藻的协同促长作用． Using the method of algae growth potential test (AGP test), three rare earth elements (La (Ⅲ), Gd (Ⅲ) and Y (Ⅲ) Rare earth mixture to study the effects of rare earth elements on the growth of algae in eutrophic water. The results showed that adding La, Gd and Y at a low concentration (0.2mg / L) could significantly promote the growth of A. crenata under the conditions of this experiment, while adding rare earth elements did not significantly promote growth. Adding phosphate (HPO2-4, 0.04 mg / L) with the addition of three kinds of rare earth elements and mixed rare earth alone, only the light rare earth La at the level of 0.2 mg / L showed the synergistic effect with phosphorus on M. crenata. Long effect.