外源稀土对作物根际离子迁移和分布的影响  

Effects of Rare Earth Elements on the Translocation and Distribution of Ions in the Rhizosphere of Rape and Rice

作　　者：丁士明[1] 张自立[2] 梁涛[1] 李素梅[2] 孙琴[3] 

机构地区：[1]中国科学院地理科学与资源研究所,北京100101 [2]安徽农业大学,安徽合肥230036 [3]南京大学环境学院污染控制与资源化研究国家重点实验室,江苏南京210093

出　　处：《稀土》2004年第1期52-56,共5页Chinese Rare Earths

基　　金：国家自然基金重大项目(29890280);国家自然基金重点项目(40232022)

摘　　要：通过根箱法,研究了外源稀土对油菜和水稻根际电导率变化及交换态K+、Ca2+迁移和分布的影响。结果表明,添加外源稀土对土壤交换态K+、Ca2+的含量无显著影响,但增加水溶态离子的含量。低浓度稀土处理下的离子分布模式和电导率与对照相比差异不大,但高浓度处理显著改变其分布模式,造成离子在根际的非正常累积,说明高浓度处理对根际环境具有较强的破坏作用。The effects of extraneous rare earth elements (REEs) on the changes of electric conductivity and the translocation and distribution of exchangeable K^+,Ca^(2+) in the rhizosphere of rape and rice were studied and rhizobox method was used.The results showed that the application of REEs had no effects on the exchangeable contents of K^+,Ca^(2+) in the soil, but increased the contents of soil water soluble K^+,Ca^(2+).The translocation and distribution pattern of K^+,Ca^(2+) and electric conductivity had no remarkable difference between the control and the treatment with low REEs dose,while high REEs changed the pattern markedly and caused the abnormal enrichment of ions in the rhizosphere, which indicated the treatment with high REEs did strongly harm to the rhizosphere environment.

关 键 词：稀土 根际 迁移 分布 根箱 

分 类 号：X8[环境科学与工程—环境工程] S15[农业科学—土壤学]