文章基本信息

标题：Abundance, composition and activity of denitrifier communities in metal polluted paddy soils
本地全文：下载
作者：Yuan Liu ; Yongzhuo Liu ; Huimin Zhou 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2016
卷号：6
DOI：10.1038/srep19086
出版社：Springer Nature
摘要：Denitrification is one of the most important soil microbial processes leading to the production of nitrous oxide (N₂O). The potential changes with metal pollution in soil microbial community for N₂O production and reduction are not well addressed. In this study, topsoil samples were collected both from polluted and non-polluted rice paddy fields and denitrifier communities were characterized with molecular fingerprinting procedures. All the retrieved nirK sequences could be grouped into neither α- nor β- proteobacteria , while most of the nosZ sequences were affiliated with α- proteobacteria . The abundances of the nirK and nosZ genes were reduced significantly in the two polluted soils. Thus, metal pollution markedly affected composition of both nirK and nosZ denitrifiers. While the total denitrifying activity and N₂O production rate were both reduced under heavy metal pollution of the two sites, the N₂O reduction rate showed no significant change. These findings suggest that N₂O production activity could be sensitive to heavy metal pollution, which could potentially lead to a decrease in N₂O emission in polluted paddies. Therefore, metal pollution could have potential impacts on soil N transformation and thus on N₂O emission from paddy soils.