气候变化领域集成服务门户(CCPortal): Warming inhibits HgII methylation but stimulates methylmercury demethylation in paddy soils

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DOI	10.1016/j.scitotenv.2024.172832
	Warming inhibits HgII methylation but stimulates methylmercury demethylation in paddy soils
	Zhang, Qianshuo; Pu, Qiang; Hao, Zhengdong; Liu, Jiang; Zhang, Kun; Meng, Bo; Feng, Xinbin
发表日期	2024
ISSN	0048-9697
EISSN	1879-1026
起始页码	930
卷号	930
英文摘要	Inorganic mercury (Hg II ) can be transformed into neurotoxic methylmercury (MeHg) by microorganisms in paddy soils, and the subsequent accumulation in rice grains poses an exposure risk for human health. Warming as an important manifestation of climate change, changes the composition and structure of microbial communities, and regulates the biogeochemical cycles of Hg in natural environments. However, the response of specific Hg II methylation/demethylation to the changes in microbial communities caused by warming remain unclear. Here, nationwide sampling of rice paddy soils and a temperature -adjusted incubation experiment coupled with isotope labeling technique ( 202 Hg II and Me 198 Hg) were conducted to investigate the effects of temperature on Hg II methylation, MeHg demethylation, and microbial mechanisms in paddy soils along Hg gradients. We showed that increasing temperature significantly inhibited Hg II methylation but promoted MeHg demethylation. The reduction in the relative abundance of Hg-methylating microorganisms and increase in the relative abundance of MeHg-demethylating microorganisms are the likely reasons. Consequently, the net Hg methylation production potential in rice paddy soils was largely inhibited under the increasing temperature. Collectively, our findings offer insights into the decrease in net MeHg production potential associated with increasing temperature and highlight the need for further evaluation of climate change for its potential effect on Hg transformation in Hgsensitive ecosystems.
英文关键词	Rice paddy; Climate change; Multi-compound-specific isotope labeling; Hg transformation
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:001238061700001
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/307923
作者单位	Chinese Academy of Sciences; Institute of Geochemistry, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Sichuan Agricultural University
推荐引用方式 GB/T 7714	Zhang, Qianshuo,Pu, Qiang,Hao, Zhengdong,et al. Warming inhibits HgII methylation but stimulates methylmercury demethylation in paddy soils[J],2024,930.
APA	Zhang, Qianshuo.,Pu, Qiang.,Hao, Zhengdong.,Liu, Jiang.,Zhang, Kun.,...&Feng, Xinbin.(2024).Warming inhibits HgII methylation but stimulates methylmercury demethylation in paddy soils.SCIENCE OF THE TOTAL ENVIRONMENT,930.
MLA	Zhang, Qianshuo,et al."Warming inhibits HgII methylation but stimulates methylmercury demethylation in paddy soils".SCIENCE OF THE TOTAL ENVIRONMENT 930(2024).