Methylmercury and sulfate-reducing bacteria in mangrove sediments from Jiulong River Estuary,China

作     者：Hao Wu Zhenhua Ding Yang Liu Jinling Liu Haiyu Yan Jiayong Pan Liuqiang Li Huina Lin Guanghui Lin Haoliang Lu 

作者机构：Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems and School of Life Sciences Xiamen University Xiamen 361005 China State Key Laboratory of Environmental Geochemistry Institute of Geochemistr) Chinese Aeademy of Sciences Guiyang 550002 China Key Laboratory of Nuclear Resources and Environment East China Institute of Technology Minist~ of Education Nanchang 330013 China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2011年第23卷第1期

页      面：14-21页

核心收录：

学科分类：083001[工学-环境科学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 09[农学] 0903[农学-农业资源与环境] 

基　　金：supported by the National Natural Science Foundation of China (No.40676064,30530150) the Guangdong-HK Technology Cooperation Funding Scheme (No.08-Lh-04) the Key Laboratory of Nuclear Resources and Environment (East China Institute of Technology), the Ministry of Education (No.070717,081203) the State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry, Chinese Academy of Sciences,and the National Supporting Projects of Science & Technology in Forestry (2009BADB2B0605) 

主　　题：mercury methylmercury sediment mangrove sulfate-reducing bacteria 

摘      要：Estuaries are important sites for mercury （Hg） methylation, with sulfate-reducing bacteria （SRB） thought to be the main Hg methylators. Distributions of total mercury （THg） and methylmercury （MeHg） in mangrove sediment and sediment core from Jiulong River Estuary Provincial Mangrove Reserve, China were determined and the possible mechanisms of Hg methylation and their controlling factors in mangrove sediments were investigated. Microbiological and geochemical parameters were also determined. Results showed that SRB constitute a small fraction of total bacteria （TB） in both surface sediments and the profile of sediments. The content of THg, MeHg, TB, and SRB were （350 ± 150） ng/g, （0.47 ± 0.11） ng/g, （1.4× 10^011 ± 4.1 × 10^9） cfu/g dry weight （dw）, and （5.0× 10^6 d： 2.7 × 10^6） cfu/g dw in surficial sediments, respectively, and （240 ± 24） ng/g, （0.30 ± 0.15） ng/g, （1.9 × 10^11 ± 4.2 × 10^9） cfu/g dw, and （1.3 × 10^6 ± 2.0 × 10^6） cfu/g dw in sediment core, respectively. Results showed that THg, MeHg, TB, MeHg/THg, salinity and total sulfur （TS） increased with depth, but total organic matter （TOM）, SRB, and pH decreased with depth. Concentrations of MeHg in sediments showed significant positive correlation with THg, salinity, TS, and MeHg/THg, and significant negative correlation with SRB, TOM, and pH. It was concluded that other microbes, rather than SRB, may also act as main Hg methylators in mangrove sediments.