Nitrogen-cycling processes under long-term compound heavy metal(loids)pressure around a gold mine:Stimulation of nitrite reduction  

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作  者:Xuesong Hu Xiaoxia Liu Shuo Zhang Caihong Yu 

机构地区:[1]School of Chemical&Environmental Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China [2]Beijing Cultivated Land Construction and Protection Center,Beijing 100020,China

出  处:《Journal of Environmental Sciences》2025年第1期571-581,共11页环境科学学报(英文版)

基  金:supported by the National Natural Science Foundation of China(No.41977029).

摘  要:Mining and tailings deposition can cause serious heavy metal(loids)pollution to the surrounding soil environment.Soil microorganisms adapt their metabolism to such conditions,driving alterations in soil function.This study aims to elucidate the response patterns of nitrogen-cycling microorganisms under long-term heavy metal(loids)exposure.The results showed that the diversity and abundance of nitrogen-cyclingmicroorganisms showed negative feedback to heavy metal(loids)concentrations.Denitrifying microorganisms were shown to be the dominant microorganisms with over 60%of relative abundance and a complex community structure including 27 phyla.Further,the key bacterial species in the denitrification process were calculated using a random forest model,where the top three key species(Pseudomonas stutzei,Sphingobium japonicum and Leifsonia rubra)were found to play a prominent role in nitrite reduction.Functional gene analysis and qPCR revealed that nirK,which is involved in nitrite reduction,significantly accumulated in the most metal-rich soil with the increase of absolute abundance of 63.86%.The experimental results confirmed that the activity of nitrite reductase(Nir)encoded by nirK in the soil was increased at high concentrations of heavy metal(loids).Partial least squares-path model identified three potential modes of nitrite reduction processes being stimulated by heavy metal(loids),the most prominent of which contributed to enhanced nirK abundance and soil Nir activity through positive stimulation of key species.The results provide new insights and preliminary evidence on the stimulation of nitrite reduction processes by heavy metal(loids).

关 键 词:N cycle Nitrite reduction Nitrite reductase METAGENOME Key species 

分 类 号:X703[环境科学与工程—环境工程]

 

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