镉胁迫对2种酸性土壤地肤生长及其修复镉能力的影响

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摘要针对南方农田酸性土壤重金属镉(Cd)污染突出的问题,分别以初始镉(Cd)(1.253, 1.553, 2.153, 2.753, 4.253, 10.253mg/kg)胁迫及pH值6.10(T处理组)、pH值5.00(TS处理组)下的样土为盆栽土壤,选取地肤为修复植物,通过温室盆栽控制实验研究Cd污染土壤中地肤的耐性以及初始土壤pH值和Cd浓度对地肤提取土壤中Cd能力的影响.结果表明,所有处理组成熟期地肤茎生物量均高于地下根系生物量;T处理组地肤的根际土、非根际土有效态Cd含量均高于TS处理组;所有处理组地肤的茎部Cd含量均高于根系(即根茎转移系数大于1),且根系和茎部的富集系数均大于1.通过对地肤种植前后土壤镉含量进行对比分析结果显示,T和TS处理组每盆地肤对Cd的去除率分别为0.84%~1.85%、0.94%~2.38%,说明地肤对酸性土镉污染具有更好的修复效果.在T处理组,当土壤Cd浓度为2.753mg/kg时,地肤对土壤Cd的去除率达到最高,为(0.62±0.16)%;在TS处理组,则是土壤Cd浓度为1.253mg/kg时的去除效果最佳,为(0.79±0.07)%.综合表明地肤对农田酸性土壤Cd污染具有较好的提取修复效果,是一种理想的目标修复植物.

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	杨海君
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	王凡

关键词 ：镉胁迫, 地肤, 植物修复, 镉吸收, 酸性土壤

Abstract：To solve the serious pollution of heavy metal cadmium (Cd) in acidic farmland soils in southern China, the soils under initial Cd stress (with concentrations of 1.253, 1.553, 2.153, 2.753, 4.253, 10.253mg/kg) and pH 6.10 (T treatment group) and pH 5.00 (TS treatment group) were used as potting soils, and Kochia scoparia (L.) was selected as restoration plant to study the tolerance of Kochia scoparia (L.) in Cd contaminated soils and the effect of initial soil pH and Cd concentration on the ability of Kochia scoparia (L.) extracting Cd from the soils through greenhouse pot experiments. The results showed that in all treatment groups, the biomass of mature Kochia scoparia (L.) stems was higher than that of the roots. The available Cd content in rhizosphere and non-rhizosphere soils of T treatment group was higher than that of TS treatment group. The Cd content in the stems of Kochia scoparia (L.) was higher than that in the roots, and the bioconcentration coefficient of Kochia scoparia (L.) roots and stems were all greater than 1. The Cd content in soils before and after planting was compared and analyzed, and the results showed that the Cd removal rates per pot of Kochia scoparia (L.) were 0.84%~1.85% and 0.94%~2.38% in T and TS treatments, respectively, indicating that Kochia scoparia (L.) can better remediate Cd pollution in acid soils. In the T treatment group, the removal rate reached the highest of (0.62±0.16)% when the Cd concentration in soils was 2.753mg/kg, while in the TS treatment group, the removal rate of Cd was the highest of (0.79±0.07)% when the Cd concentration in soils was 1.253mg/kg. The results showed that Kochia scoparia (L.) has a good effect to extract and remediate Cd pollution of acid soils in farmland, and it is an ideal restoration plant.

Key words： cadmium stress Kochia scoparia (L.) phytoremediation cadmium absorption acid soil

收稿日期: 2022-10-08

PACS:

X53

基金资助:湖南省自然科学基金科教联合基金(2022JJ60096)

通讯作者: 王凡,工程师,13187000766@163.com E-mail: 13187000766@163.com

作者简介: 杨海君(1972-),男,湖南长沙人,教授,博士,从事微生物资源与利用研究.发表论文80余篇.1227677453@qq.com.

引用本文:

杨海君, 郭佳源, 谭菊, 谭璐, 朱姝, 吴亮, 张皓, 牛鸿宇, 王凡. 镉胁迫对2种酸性土壤地肤生长及其修复镉能力的影响[J]. 中国环境科学, 2023, 43(5): 2423-2433. YANG Hai-jun, Guo Jia-yuan, TAN Ju, TAN Lu, ZHU Shu, WU Liang, ZHANG Hao, NIU Hong-yu, WANG Fan. Effects of cadmium stress on the growth and cadmium remediation of Kochia scoparia (L.) in two kinds of acid soils. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(5): 2423-2433.

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