• 关键词：镧积累  水稻  EC₅₀  生理指标

• 基金项目：国家自然科学基金重大项目(29890282);中国科学院红壤试验站开放基金资助项目(2000k06)

• 曾青
• 中国科学院南京土壤所物质循环开放实验室,南京 210008

• 朱建国
• 中国科学院南京土壤所物质循环开放实验室,南京 210008

• 成后龙
• 中国科学院南京土壤所物质循环开放实验室,南京 210008

• 谢祖彬
• 中国科学院南京土壤所物质循环开放实验室,南京 210008

• 褚海燕
• 中国科学院南京土壤所物质循环开放实验室,南京 210008

• 摘要：通过盆栽试验, 研究了红壤中稀土元素镧对水稻的生长发育, 产量和一些对环境敏感的生理生化指标的影响.结果表明, La浓度为75mg·kg^-1时水稻的生育期明显滞后, La浓度为300mg·kg^-1时水稻的生长显著受到抑制, 产量显著降低, 水稻生物量降低一半的EC₅₀=323.02mg·kg^-1.La浓度为75mg·kg^-1时水稻的叶绿素ab显著降低, POD活性、细胞质膜透性和游离脯氨酸含量显著增高.

• Abstract：The effects of different concentration of La added in red soil on the growth, yield, content of chlorophyll, POD activity, cell membrane permeability and content of proline of rice were studied by pot experiments. The results showed that the growth stage of rice was delayed when more than 75mg·kg^-1 La was added and the growth and yield of rice could be obviously inhibited by adding 300mg·kg^-1 La. The rice was killed after 600mg·kg^-1 La was added. EC₅₀=323.02mg·kg^-1. When the exogenous concentration of La was more than 75mg·kg^-1 the chlorophyll a/b decreased, while the POD activity, the cell membrane permeability and content of proline of rice increased significantly.

• Key words：rare earth accumulation  rice  EC₅₀  physiological indexes

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