红壤中镧积累对水稻的生理生态效应  

Ecophysiological response of rice to lanthanum accumulation in red earth

作　　者：曾青[1] 朱建国[1] 成后龙 谢祖彬[1] 褚海燕[1] 

机构地区：[1]中国科学院南京土壤所物质循环开放实验室,南京210008

出　　处：《环境科学学报》2003年第1期17-21,共5页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金重大项目 (2 9890 2 82 );中国科学院红壤试验站开放基金资助项目 (2 0 0 0k0 6 )

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 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 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 75*!mg·kg -1 La was added and the growth and yield of rice could be obviously inhibited by adding 300*!mg·kg -1 La. The rice was killed after 600*!mg·kg -1 La was added. EC 50=323^02*!mg·kg -1. When the exogenous concentration of La was more than 75*!mg·kg -1 the chlorophyll a/b decreased, while the POD activity, the cell membrane permeability and content of proline of rice increased significantly.

关 键 词：红壤 生理生态效应 镧积累 水稻 EC50 生理指标 生长抑制 重金属污染 土壤污染 

分 类 号：X530.323.1[环境科学与工程—环境工程]