根际环境中铅的形态转化

应用生态学报 ›› 2002, Vol. ›› Issue (9): 1145-1149.

根际环境中铅的形态转化

林琦¹, 陈怀满², 郑春荣², 陈英旭¹

1. 浙江大学华家池校区环境工程系, 杭州 310029;
2. 中国科学院南京土壤研究所, 南京 210008

收稿日期:2000-05-15 修回日期:2000-09-04 出版日期:2002-09-15
通讯作者: 陈英旭
基金资助:
国家自然科学基金项目(29777020);浙江省自然科学基金项目(297032);中国科学院土壤圈物质循环开放实验室资助项目.

Conformation transformation of lead in rhizosphere

LIN Qi¹, CHEN Huaiman², ZHENG Chunrong², CHEN Yingxu¹

1. Department of Environmental Science, Zhejiang University, Hangzhou 310029;
2. Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008

Received:2000-05-15 Revised:2000-09-04 Online:2002-09-15

摘要/Abstract

摘要： 用根际箱试验研究了红壤植麦和植稻后根际中Pb的形态转化,讨论了与Cd复合处理对Pb形态的影响.结果表明,Pb在红壤根际、非根际的主要形态为酸解态+碳酸盐态、交换态和铁锰氧化物结合态.交换态Pb都是根际>非根际;不同Pb处理浓度和PbCd交互作用都对Pb的形态分布产生影响,小麦根际随加入Cd浓度增大,根际交换态Pb和铁锰氧化物结合态Pb下降;水稻根际交换态Pb与Cd复合处理浓度密切相关,5mgCd·kg^-1复合处理,根际交换态Pb的活化较单元素弱,10mgCd·kg^-1复合处理,根际交换态Pb的活化较单元素要强.

关键词: 铅, 根际环境, 镉, 形态

Abstract: With rhizoboxes,this study dealt with the distribution and conformation transformation of lead in the rhizosphere and non-rhizosphere of wheat and rice grown on red soil. The results showed that the predominant forms of lead were acid dissolved and Carb-Pb (bound to carbonates),Exch-Pb (exchangeable-Pb),and FeMnO-Pb (boud to iron and manganese oxides). Exch-Pb in the rhizosphere of both rice and wheat was much higher than those in the non-rhizosphere, which means that the activation process in the rhizosphere was very strong,and bio-available Pb greatly increased. Various levels of Pb treatment and Pb-Cd interaction also had certain effects on the distribution of lead. In treatment of low Pb concentration,FeMnO-Pb was higher than Exch-Pb,but the contrary result was observed in treatment of high Pb concentration. Both Exch-Pb and FeMnO-Pb in wheat rhizosphere decreased with an increase of Cd. Exch-Pb in rice rhizosphere was correlative to the Cd content in soil. Compared with the treatment in the absence of Cd, the activation of Exch-Pb in rice rhizosphere was weaker in 5 mg Cd穔g^-1 treatment, but stronger in10 mg Cd穔g^-1 treatment.

中图分类号:

X171

林琦, 陈怀满, 郑春荣, 陈英旭. 根际环境中铅的形态转化[J]. 应用生态学报, 2002, (9): 1145-1149.

LIN Qi, CHEN Huaiman, ZHENG Chunrong, CHEN Yingxu. Conformation transformation of lead in rhizosphere[J]. Chinese Journal of Applied Ecology, 2002, (9): 1145-1149.

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