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 30 0mg·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 =32 3 0 2mg·kg-1.La浓度为 75mg·kg-1时水稻的叶绿素a b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 . The pot experiment was conducted to study the effect of rare earth elements lanthanum on the growth and yield of rice and some physiological and biochemical parameters sensitive to the environment.The results showed that the growth period of La was obviously lagged when La concentration was 75 mg · kg- At 30 mg · kg-1, the growth of rice was significantly inhibited and the yield was significantly reduced. The EC50 of halved rice biomass was 32 30 2 mg · kg-1, and the chlorophyll ab Significantly decreased POD activity, plasma membrane permeability and free proline content was significantly increased.