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头花蓼对重金属Cd的吸收特性与累积规律初探

农业环境科学学报2010,29(11):2094-2099

Journal of Agro-Environment Science

摘要:以野生地被植物头花蓼为试验材料,采用温室盆栽法,对重金属Cd 在该植物体内的吸收、累积分布以及迁移特性进行了初步研究。结果表明,Cd 对头花蓼生长未造成显著影响,甚至低浓度(≤5mg ·kg -1)Cd 具有一定的生长促进作用,表现为植物的生物量增加。当Cd 处理浓度达到50mg ·kg -1时,植物的生物量虽有所降低,但与对照相比并无显著差异。植株不同部位对Cd 的积累具有分异特性,地下部根系的累积量最大,叶次之,茎最小,且随处理浓度的增加而增加,在Cd 处理浓度为50mg ·kg -1时均达到最大值,分别为182.69、31.49mg ·kg -1和10.34mg ·kg -1。植株对Cd 富集系数和转移系数分别为0.46~1.55和0.14~0.67,且地上部对Cd 的最大迁移总量高达100.09μg ·plant -1。说明头花蓼对修复Cd 污染土壤具有一定的潜力,是一种修复Cd 污染较好的景观地被植物种质资源。

关键词:头花蓼;Cd 污染;吸收;富集

中图分类号:X173文献标志码:A 文章编号:1672-2043(2010)11-2094-06

头花蓼对重金属Cd 的吸收特性与累积规律初探

杨艳,吴宗萍,张敏,李政,李凌

(西南大学园艺园林学院,重庆400715)

A Primary Research on Polygonum capitatum ′s Absorption Property and Accumulation Rule to Heavy Metal Cd YANG Yan,WU Zong-ping,ZHANG Min,LI Zheng,LI Ling

(College of Horticulture and Landscape,Southwest University,Chongqing 400715,China )

Abstract :By using wild groundcover plant —P.capitatum as the experiment material and the pot-culture method,this paper studied the ab -sorption,accumulation and transference properties of heavy metal Cd in the plant .The results showed that Cd had no remarkable impact on the growth of P.capitatum ,and even low concentration of Cd (≤5mg ·kg -1)could promote the growth,and increase the biomass.When the

Cd concentration reached 50mg

·kg -1,the biomass had somewhat decreased but there was no distinctive difference comparing with the con -trol.The different parts of the plant had a quite different accumulation amounts of Cd and the sequence was root>leaf>stem.The accumulation

amount would increase as the increase of treatment concentrations of Cd in soils,and reached a peak at the Cd concentration of 50mg ·

kg -1,the maximum quantity being 182.69mg ·kg -1in root,31.49mg ·kg -1in leaf and 10.34mg ·kg -1in stem.The bioaccumulation coefficient of Cd was 0.46~1.55,and the translocation coefficient was 0.14~0.67for Cd,and the largest total transference amount in shoot was up to 100.09μg ·plant -1.These suggested that P.capitatum had the potential to remediate Cd polluted soil.Therefore,it is a preferable germplasm re -sources of landscape groundcover plant for phytoremediation of Cd polluted soil .

Keywords :Polygonum capitatum Ham ex D.Don ;Cd pollution;absorption;accumulation

收稿日期:2010-05-29作者简介:杨艳(1984—),女,四川广安人,硕士研究生,主要从事园林植物生物技术与遗传育种研究。E-mail :317383669@http://www.wendangku.net/doc/15fa3beacc175527072208f1.html

通讯作者:李凌E-mail :hortlily@http://www.wendangku.net/doc/15fa3beacc175527072208f1.html Cd 是生物毒性最强的重金属元素之一,在土壤

中移动性强,易被植物吸收累积,对植物产生明显毒

害。据统计,我国约有1.3万hm 2耕地受到Cd 污染,

每年仅生产受Cd 污染的稻米就达5万t 以上,严重影响粮食生产和食品安全[1]。因此,Cd 污染土壤的治理一直是倍受关注的热点研究课题[2-3]。目前,国内外关于Cd 对植物的毒害、生理特性以及生态效应等方面的研究已有大量报道[4-8],但以花卉为供试材料的研

究还很少。

头花蓼(PolygonumcapitatumBuch.-Ham.ex D.Don )

别名四季红、铜矿草、石辣蓼、石莽草等,属蓼科蓼属

多年生草本植物,叶片彩色,花期长,匍匐成片生长形

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