Water-soluble mercury induced by organic amendments affected microbial community assemblage in mercury-polluted paddy soil

被引：16

作者：

Hu, Hualing ^{[1
,2
]}

Li, Meng ^{[2
]}

Wang, Guoxi ^{[4
]}

Drosos, Marios ^{[3
]}

Li, Zhen ^{[5
]}

Hu, Zhengyi ^{[4
]}

Xi, Beidou ^{[1
,2
]}

机构：

[1] Tianjin Univ, Coll Environm Sci & Engn, Tianjin 300035, Peoples R China

[2] Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China

[3] Nanjing Agr Univ, Inst Resource Ecosyst & Environm Agr, Fac Biol & Environm, 1 Weigang Rd, Nanjing 210095, Jiangsu, Peoples R China

[4] Univ Chinese Acad Sci, Sino Danish Coll, Coll Resources & Environm, Beijing 100049, Peoples R China

[5] Chinese Res Inst Environm Sci, Dept Soil Pollut & Control, Beijing 100012, Peoples R China

来源：

CHEMOSPHERE | 2019年 / 236卷

基金：

中国博士后科学基金;

关键词：

Mercury (Hg); Organic fertilizers; Mercury toxicity; 16S rRNA genes sequencing; merA/merB gene; HUMIC SUBSTANCES; BACTERIAL COMMUNITIES; CONTAMINATED SOIL; FULVIC-ACIDS; DIVERSITY; MATTER; GENES; METAL; FERTILIZATION; BIOAVAILABILITY;

D O I：

10.1016/j.chemosphere.2019.124405

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Mercury (Hg) pollution or organic amendments (OA) may individually induce changes in the microbial community of paddy soils. However, little is known regarding the interaction of Hg and OA and the effect of different OA applications on the microbial community assemblage in Hg-polluted paddy soil. A soil incubation experiment was performed by applying three organic amendments (OA), namely a food waste compost (FC), and its HA and FA, into an Hg-polluted paddy soil to examine the changes in the microbial community and merA/merB gene abundance. The results showed that the OA treatments promoted total (SOC) and dissolved organic carbon (DOC) in soils, which may harbor copiotrophic bacteria. The HA and FA treatments decreased microbial diversity and richness along with an increase of water-soluble Hg (WHg) through the complexation of DOC to Hg, which may be mainly attributed to the enhanced Hg biotoxicity to soil microbiome induced by the increased WHg under these two treatments. Additionally, the WHg enhancement also contributed to the increase of Hg-resistant bacteria and merA/merB gene abundance, and consequently, induced changes in the microbial community. These results indicated the interaction of Hg and different OA induced the variation of WHg fraction in paddy soil, which played a fundamental role in the distinct responses of the microbial community assemblage. Collectively, the application of FA and HA to Hg-polluted soil should be limited considering Hg risk to microbiome, and FC can be an alternative. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页数：11

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