苦草对砷的富集作用  

Characterization of arsenic accumulation by Vallisneria natans

作　　者：陈国梁[1,2] 冯涛[1] 李志贤[1] 陈章[1] 徐建明[2] 王海华 向言词 余光辉[4] 朱佳文[4] 

机构地区：[1]湖南科技大学煤炭资源清洁利用与矿山环境保护湖南省重点实验室,湘潭411201 [2]浙江大学环境与资源学院,杭州310058 [3]重金属污染土壤生态修复与安全利用湖南省高校重点实验室,湘潭411201 [4]湖南科技大学建筑与城乡规划学院,湘潭411201

出　　处：《生态学报》2017年第14期4671-4675,共5页Acta Ecologica Sinica

基　　金：国家自然科学青年基金项目(41501343);国家自然科学青年基金项目(31400374);湖南省重点实验室开放基金项目(E21501);湖南科技大学自然科学基金项目(E54005);湖南省教育厅项目(15C0534);湖南省教育厅项目(14B066)

摘　　要：为了探求合适的水体砷污染修复植物及砷在食物链中传递、累积的特点,以常见的沉水植物-苦草为研究对象,对受砷污染的水体进行修复,结果表明:苦草对水环境中砷的富集能在较短的时间内(3 d)达到一个较大值,到第14天,不同砷水平(<2 mg/L)处理下的苦草对砷富集系数均超过200;苦草中砷浓度随处理时间及外源砷浓度的增加而增加,且与外源砷浓度之间存在极显著地正相关;苦草在不同浓度砷处理下都生长良好,对砷胁迫表现出较强的耐受性。因此,苦草对于水体的砷污染有着很好的去除效果,同时也能很好地反映出一个地区的砷污染水平。To identify suitable plant species for the phytoremediation of arsenic-contaminated water and ensure the safety of people and animals, Vallisneria natans （ Lour. ） Hara was investigated for its ability to remove As from contaminated water. After 3 days of different As treatments （ 〈2 mg/L） , the As concentrations in the plants were high and the bioconeentration factor of V. natans exceeded 200 at 14 days. The As concentrations in all plants increased with time and increasing As concentration in the environment. As accumulation in the plant was significantly correlated with that in the environment. After exposure to different As treatments, V. natans showed good growth. This suggests that V. natans is highly tolerant to As and stable against environmental changes. Therefore, phytoremediation of arsenic-contaminated water can be achieved using V. natans and As accumulation in plants can reflect the level of As pollution in a region.

关 键 词：植物修复 砷 水污染 沉水植物 苦草 

分 类 号：X173[环境科学与工程—环境科学]