The microbial mechanisms by which long-term heavy metal contamination affects soil organic carbon levels

被引：0

作者：

Xiao Z. ^{[1
]}

Duan C. ^{[1
]}

Li S. ^{[1
,2
]}

Chen J. ^{[3
]}

Peng C. ^{[4
]}

Che R. ^{[1
]}

Liu C. ^{[1
]}

Huang Y. ^{[1
]}

Mei R. ^{[1
]}

Xu L. ^{[1
]}

Luo P. ^{[1
]}

Yu Y. ^{[1
]}

机构：

[1] School of Ecology and Environmental Science & Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments & Yunnan International Joint Research Center of Plateau Lake Ecological Restoration and Watershed Management, Yunnan U

[2] Hangzhou Carbon Peaking and Carbon Neutrality Research Center, Business School, Zhejiang University City College, Hangzhou

[3] Department of Agroecology & Aarhus University Centre for Circular Bioeconomy, Aarhus University, Tjele

[4] Institute of Environment Sciences, Department of Biology Sciences, University of Quebec at Montreal, Case Postale 8888, Succ. Centre-Ville, Montreal

来源：

Chemosphere | 2023年 / 340卷

基金：

中国国家自然科学基金;

关键词：

Bacteria; Carbon cycle; Carbon reduction; Fungi; Soil heavy metal pollution;

D O I：

10.1016/j.chemosphere.2023.139770

中图分类号：

学科分类号：

摘要：

Globally, reducing carbon emissions and mitigating soil heavy metal pollution pose pressing challenges. We evaluated the effects of lead (Pb) and cadmium (Cd) contamination in the field over 20 years. The five treatment groups featured Pb concentrations of 40 and 250 mg/kg, Cd concentrations of 10 and 60 mg/kg, and a combination of Pb and Cd (60 and 20 mg/kg, respectively); we also included a pollution-free control group. After 20 years, soil pH decreased notably in all treatments, particularly by 1.02 in Cd10-treated soil. In addition to the increase of SOC in Cd10 and unchanged in Pb40 treatment, the SOC was reduced by 9.62%–12.98% under the other treatments. The α diversities of bacteria and fungi were significantly changed by Cd10 pollution (both p < 0.05) and the microbial community structure changed significantly. However, there were no significant changes in bacterial and fungal communities under other treatments. Cd10 pollution reduced the numbers of Ascomycota and Basidiomycota fungi, and enhanced SOC accumulation. Compared to the control, long-term heavy Cd, Pb, and Pb–Cd composite pollution caused SOC loss by increasing Basidiomycota which promoting carbon degradation, and decreasing Proteobacteria which promoting carbon fixation via the Krebs cycle. Our findings demonstrate that heavy metal pollution mediates Carbon-cycling microorganisms and genes, impacting SOC storage. © 2023

引用

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