摘要
镉是当前中国耕地土壤重金属污染最主要的元素之一,对土壤质量、作物产量及人体健康等均会产生显著危害,镉污染土壤修复已成为目前的研究热点与重点内容。文章通过室外模拟盆栽实验,以国际标准蚓种赤子爱胜蚓、超积累植物龙葵为研究对象,探讨了1、5条/kg蚯蚓密度(E1、E5)与龙葵(S)联合修复镉污染土壤效果以及蚯蚓和龙葵对镉的富集转移。研究表明:(1)龙葵株高、生物量、叶面积随镉胁迫浓度增加而显著减小,龙葵和蚯蚓对镉的富集随镉浓度的增加而显著增加;(2)蚯蚓、龙葵能有效富集土壤镉,促进土壤全镉和有效镉的去除,其中SE1处理组更有利于龙葵富集镉和土壤镉的去除,SE1处理下龙葵镉部分镉富集量达最大,分别为地上部149.85 mg/kg、地下部158.62 mg/kg,使得SE1处理组的土壤全镉含量最少,为32.84 mg/kg;(3)30 mg/kg镉胁迫下,S处理组龙葵富集系数为4.31,低于SE1(9.53)和SE5(6.47)处理组,可见龙葵对镉具有较好的富集和转移能力,且蚯蚓活动促进了龙葵对镉的富集转移能力;(4)镉胁迫下不同蚯蚓密度与龙葵联合栽植均导致土壤全磷、全碳含量显著下降,土壤pH与全氮含量显著增加。该研究可为镉污染土壤的生物组合修复模式提供数据支持和科学依据。
Cadmium is one of the most important elements of heavy metal pollution in cultivated soil in China,which can cause significant harm to soil quality,crop yield and human health.Remediation of cadmium-contaminated soil has become the focus and focus of current research.Through outdoor simulated pot experiment,Eisenia foetida(an international standard species of worm),and Solanum nigrum were taken as the research objects.The effects of 1,5 earthworms/kg(E1,E5)combined with Solanum nigrum(S)on the remediation of cadmium-contaminated soil and the enrichment and transfer of cadmium by earthworm and Solanum nigrum were studied.The results showed that:(1)the plant height,biomass and leaf area of Solanum nigrum decreased significantly with the increase of cadmium concentration,and the enrichment of cadmium in Solanum nigrum and earthworm increased significantly with the increase of cadmium concentration;(2)Earthworm and Solanum nigrum can effectively enrich soil cadmium and promote the removal of total and available cadmium in soil,among which the SE1 treatment group is more conducive to the enrichment of cadmium in Solanum nigrum and the removal of soil cadmium.The cadmium enrichment in the cadmium part of Solanum nigrum under SE1 treatment reaches the highest level,which is 149.85 mg/kg above ground and 158.62 mg/kg underground,respectively.The total cadmium content of soil in SE1 treatment group was the lowest,which was 32.84 mg/kg.(3)Under 30 mg/kg cadmium stress,the enrichment coefficient of Solanum nigrum in S treatment group was 4.31,which was lower than that in SE1(9.53)and SE5(6.47)treatment groups,indicating that Solanum nigrum had a better ability to enrich and transfer cadmium,and earthworm activity promoted the ability to enrich and transfer cadmium.(4)The combined planting of earthworm density and Solanum nigrum led to a significant decrease in soil total phosphorus and carbon contents,and a significant increase in soil pH and nitrogen contents under cadmium stress.This study can provides data support and scientific basis for bioremediation of cadmium-contaminated soil.
作者
字玉奋
张维兰
刘嫦娥
段昌群
罗庆睿
赵奕乔
ZI Yufen;ZHANG Weilan;LIU Chang’e;DUAN Chuangqun;LUO Qingrui;ZHAO Yiqiao(School of Ecology and Environmental Sciences&Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments,Yunnan University,Kunming 650091,China;Yunnan Field Scientific Station for Restoration of Ecological Function in Central Yunnan of China,Kunming 650091,China;International Cooperative Center of Plateau Lake Ecological Restoration and Watershed Management of Yunnan,Kunming 650091,China)
出处
《环境科学与技术》
CSCD
北大核心
2024年第S2期201-212,共12页
Environmental Science & Technology
基金
云南省基础研究计划重点项目(202201BF070001-002,202201AS070016)
国家自然科学基金项目(32260315)
关键词
赤子爱胜蚓
龙葵
镉污染土壤
生物联合修复
Eisenia foetida
Solanum nigrum
cadmium polluted soil
combined bioremediation
