Indigenous earthworms and gut bacteria are superior to chemical amendments in the remediation of cadmium-contaminated seleniferous soils
The natural selenium (Se)-rich areas in China are generally characterized by high geological background of cadmium (Cd) which poses potential risks to human health. Therefore, immobilization of Cd is the prerequisite to ensure the safe utilization of natural seleniferous soil resources. A pot experi...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-10-01
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| Series: | Ecotoxicology and Environmental Safety |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0147651322009629 |
| _version_ | 1811206284346654720 |
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| author | Ruyi Yang Linfeng Luo Nan Zhao Fuyu Guo Meng Zhu Shuting Zan Tianao Yu Fengxiang X. Han Jingxuan Huang |
| author_facet | Ruyi Yang Linfeng Luo Nan Zhao Fuyu Guo Meng Zhu Shuting Zan Tianao Yu Fengxiang X. Han Jingxuan Huang |
| author_sort | Ruyi Yang |
| collection | DOAJ |
| description | The natural selenium (Se)-rich areas in China are generally characterized by high geological background of cadmium (Cd) which poses potential risks to human health. Therefore, immobilization of Cd is the prerequisite to ensure the safe utilization of natural seleniferous soil resources. A pot experiment was conducted to compare the effects of indigenous earthworm (Amynthas hupeiensis) and its gut bacteria (Citrobacter freundii DS strain) on the remediation of Cd-contaminated seleniferous soil with two traditional chemical amendments. The results indicated that earthworms and DS strain decreased DGT-extractable Cd by 25.52 − 41.53% and reduced Cd accumulation in lettuce leaves by 20.83 − 37.50% compared with control through converting the exchangeable Cd (EX-Cd) into residual Cd (RE-Cd) fractions. Overall, earthworms and DS strain were more effective in Cd immobilization, growth and quality promotion, oxidative stress alleviation, Cd accumulation and bioaccessibility reduction in the soil-lettuce-human continuum than biochar and lime. Moreover, all amendments induced the antagonism between Se and Cd through increasing bioavailable Se/Cd molar ratios in soil. However, all the Cd concentrations in lettuce exceeded the maximum permissible limit of Cd for leaf vegetables, indicating that soil amendment alone could not ensure food safety. This study confirmed that biological amendments were superior to chemical amendments in the remediation of Cd-contaminated seleniferous soil. |
| first_indexed | 2024-04-12T03:46:16Z |
| format | Article |
| id | doaj.art-4f84b1184e0c495c977b98b8fa8e939b |
| institution | Directory Open Access Journal |
| issn | 0147-6513 |
| language | English |
| last_indexed | 2024-04-12T03:46:16Z |
| publishDate | 2022-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ecotoxicology and Environmental Safety |
| spelling | doaj.art-4f84b1184e0c495c977b98b8fa8e939b2022-12-22T03:49:08ZengElsevierEcotoxicology and Environmental Safety0147-65132022-10-01245114122Indigenous earthworms and gut bacteria are superior to chemical amendments in the remediation of cadmium-contaminated seleniferous soilsRuyi Yang0Linfeng Luo1Nan Zhao2Fuyu Guo3Meng Zhu4Shuting Zan5Tianao Yu6Fengxiang X. Han7Jingxuan Huang8School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China; Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-founded by Anhui Province and Ministry of Education, Anhui Normal University, Wuhu 241002, China; Anhui Provincial Engineering Laboratory of Water and Soil Pollution Control and Remediation, Anhui Normal University, Wuhu 241002, China; Corresponding author at: School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China.School of Ecology and Environment, Anhui Normal University, Wuhu 241002, ChinaSchool of Ecology and Environment, Anhui Normal University, Wuhu 241002, ChinaSchool of Ecology and Environment, Anhui Normal University, Wuhu 241002, China; Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-founded by Anhui Province and Ministry of Education, Anhui Normal University, Wuhu 241002, China; Anhui Provincial Engineering Laboratory of Water and Soil Pollution Control and Remediation, Anhui Normal University, Wuhu 241002, ChinaSchool of Ecology and Environment, Anhui Normal University, Wuhu 241002, China; Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-founded by Anhui Province and Ministry of Education, Anhui Normal University, Wuhu 241002, China; Anhui Provincial Engineering Laboratory of Water and Soil Pollution Control and Remediation, Anhui Normal University, Wuhu 241002, ChinaSchool of Ecology and Environment, Anhui Normal University, Wuhu 241002, China; Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-founded by Anhui Province and Ministry of Education, Anhui Normal University, Wuhu 241002, China; Anhui Provincial Engineering Laboratory of Water and Soil Pollution Control and Remediation, Anhui Normal University, Wuhu 241002, ChinaSchool of Ecology and Environment, Anhui Normal University, Wuhu 241002, ChinaJackson State University, Department of Chemistry, Physics and Atmospheric Sciences, Jackson, MS 39217, USASchool of Ecology and Environment, Anhui Normal University, Wuhu 241002, ChinaThe natural selenium (Se)-rich areas in China are generally characterized by high geological background of cadmium (Cd) which poses potential risks to human health. Therefore, immobilization of Cd is the prerequisite to ensure the safe utilization of natural seleniferous soil resources. A pot experiment was conducted to compare the effects of indigenous earthworm (Amynthas hupeiensis) and its gut bacteria (Citrobacter freundii DS strain) on the remediation of Cd-contaminated seleniferous soil with two traditional chemical amendments. The results indicated that earthworms and DS strain decreased DGT-extractable Cd by 25.52 − 41.53% and reduced Cd accumulation in lettuce leaves by 20.83 − 37.50% compared with control through converting the exchangeable Cd (EX-Cd) into residual Cd (RE-Cd) fractions. Overall, earthworms and DS strain were more effective in Cd immobilization, growth and quality promotion, oxidative stress alleviation, Cd accumulation and bioaccessibility reduction in the soil-lettuce-human continuum than biochar and lime. Moreover, all amendments induced the antagonism between Se and Cd through increasing bioavailable Se/Cd molar ratios in soil. However, all the Cd concentrations in lettuce exceeded the maximum permissible limit of Cd for leaf vegetables, indicating that soil amendment alone could not ensure food safety. This study confirmed that biological amendments were superior to chemical amendments in the remediation of Cd-contaminated seleniferous soil.http://www.sciencedirect.com/science/article/pii/S0147651322009629Selenium-rich areasCadmium contaminationChemical amendmentBiological amendmentBioavailability |
| spellingShingle | Ruyi Yang Linfeng Luo Nan Zhao Fuyu Guo Meng Zhu Shuting Zan Tianao Yu Fengxiang X. Han Jingxuan Huang Indigenous earthworms and gut bacteria are superior to chemical amendments in the remediation of cadmium-contaminated seleniferous soils Ecotoxicology and Environmental Safety Selenium-rich areas Cadmium contamination Chemical amendment Biological amendment Bioavailability |
| title | Indigenous earthworms and gut bacteria are superior to chemical amendments in the remediation of cadmium-contaminated seleniferous soils |
| title_full | Indigenous earthworms and gut bacteria are superior to chemical amendments in the remediation of cadmium-contaminated seleniferous soils |
| title_fullStr | Indigenous earthworms and gut bacteria are superior to chemical amendments in the remediation of cadmium-contaminated seleniferous soils |
| title_full_unstemmed | Indigenous earthworms and gut bacteria are superior to chemical amendments in the remediation of cadmium-contaminated seleniferous soils |
| title_short | Indigenous earthworms and gut bacteria are superior to chemical amendments in the remediation of cadmium-contaminated seleniferous soils |
| title_sort | indigenous earthworms and gut bacteria are superior to chemical amendments in the remediation of cadmium contaminated seleniferous soils |
| topic | Selenium-rich areas Cadmium contamination Chemical amendment Biological amendment Bioavailability |
| url | http://www.sciencedirect.com/science/article/pii/S0147651322009629 |
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