外源铁对铅污染土壤中宽叶香蒲铅积累的影响  

Effects of exogenous iron on lead accumulation in Typha latifolia from a lead-contaminated soil

作　　者：钟顺清[1] 徐建明[2,3] 

机构地区：[1]衡阳师范学院资源环境与旅游管理系,湖南衡阳421008 [2]浙江大学土水资源与环境研究所,杭州310058 [3]浙江省亚热带土壤与植物营养重点实验室,杭州310058

出　　处：《应用生态学报》2013年第1期78-82,共5页Chinese Journal of Applied Ecology

基　　金：湖南省自然科学基金项目(09JJ4021);衡阳师范学院科学基金项目(10B70);公益性农业科研专项(201203045-2)资助

摘　　要：采用温室盆栽方法,研究添加外源铁对不同铅浓度(0、100、500和1000mg·kg-1)污染土壤中宽叶香蒲铅积累的影响.结果表明:各铅浓度条件下,与添加100mg Fe·kg-1相比,添加500mg Fe·kg-1处理的宽叶香蒲地上部和根的铅含量均增高.土壤铅浓度为1000mg·kg-1时,添加500mg Fe·kg-1处理根的铅含量比100mg Fe·kg-1处理增加33.7%,地上部铅含量增加50.5%.添加500mg Fe·kg-1处理的根际土壤中可交换态铅比100mg Fe·kg-1处理增加77.0%～114.6%.除500mg·kg-1铅浓度外,各铅浓度条件下添加500mg Fe·kg-1处理根干质量均显著低于100mg Fe·kg-1处理.在铅污染的湿地环境中添加适量铁可以提高铅的有效性,促进铅积累.A pot experiment was conducted to study the effects of adding 100 and 500 mg·kg^-1 of exogenous iron （Fe） on the lead （Pb） accumulation in Typha latifolia growing on a soil with 0, 100, 500 and 1000 mg·kg^-1 of Pb, respectively. In treatment 500 mg Fe ·kg^-1 , the Pb concen- tration in T. latifolia shoots and roots was higher, compared with that in treatment 100 mg Fe ·kg^-1. When the soil Pb concentration was 1000 mg·kg^-1 , the Pb concentration in T. latifolia shoots and roots in treatment 500 mg Fe ·kg^-1 increased by 33.7% and 50.5%, respectively, compared with that in treatment 100 mg Fe ·kg^-1. The exchangeable Pb concentration in rhizosphere soil was 77.0% -114.6% higher in treatment 500 mg Fe ·kg^-1 than in treatment 100 mg Fe ·kg^-1. When the soil Pb concentration was O, 100 and 1000 mg·kg^-1 , the root dry mass in treatment 500 mg Fe ·kg^-1 had a significant decrease, compared with that in treatment 100 mg Fe ·kg^-1. It was suggested that adding appropriate amount of Fe to Pb-contaminated wetland soil could increase the availability of soil Pb and improve the Pb accumulation in plants.

关 键 词：铁 铅 宽叶香蒲 铅积累 湿地 

分 类 号：Q945.78[生物学—植物学] X53[环境科学与工程—环境工程]