中文摘要：

以小球藻和水华微囊藻细胞的生长状况、光合作用参数、叶绿素a质量浓度的变化作为指标,研究不同体积分数的丙酮对2种藻类的毒性效应. 结果表明：体积分数为0. 000 5%-0.500 0%的丙酮对小球藻和体积分数为0.0005%-0.050 0%的丙酮对水华微囊藻均不同程度地促进藻细胞生长,对藻类的叶绿素a无影响,明显提高了藻类的最大光合速率（rETRmax）、光能利用率g）和光适应能力ak）,同时提高了光系统n的最大光化学效率（Fv/Fm）;丙酮体积分数为5.000 0%的小球藻和丙酮体积分数为0.500 0%-5.000 0 %的水华微囊藻,其藻类光合作用、叶绿素a显著降低,导致藻类生长严重抑制甚至死亡;丙酮对小球藻和水华微囊藻的最大无影响体积分数（NOEC）分别为0.500 0%, 0. 050 0%,说明水华微囊藻对丙酮更为敏感.

英文摘要：

The toxic effects of different volume fractions of acetone on algae were studied, using the growth condition, photosynthetic parametersrs, chlorophyll a mass-concentration of Chlorella vulgaris and Microcystis flos-aquae as indexes. The results showed that 0.000 5%-0. 500 0% and 0.000 5% -0.050 0% volume frac-tions of acetone respectively were in varying degrees to promote Chlorella vulgaris and Microcystis flo s -aqu a e growth. Both concentration ranges had no significant effect on the chlorophyll a of algae, while increased the maximum photosynthetic rate （rETRmax） , the solar energy utilisation efficiency （a） and the tolerance of algae to strong light （Jk） significantly, as well as improved the photosystem H photochemical efficiency （Fv/Fm）. When the Chlorella vulgaris was at 5. 000 0% acetone volume fraction and Microcystis flo s -a qu a e at 0. 500 0% to 5. 000 0% acetone volume fractions？ algae photosynthesis and chlorophyll a were reduced obviously, which resulted in severe algal growth inhibition and even death. The corresponding NOEC of acetone was 0. 500 0% for Chlorella vulgaris and 0. 050 0% for Microcystis flos - a quae, indicating that Microcystis flos-aquae was more sensitive to acetone than Chlorella vulgaris.