Effects of microbial diversity on mercury methylation in paddy soils
Inorganic mercury(Hg)in paddy soil can be converted into highly neurotoxic methylmercury under the action of microorganisms.Methylmercury is often enriched in rice,posing a potential threat to human health.Due to the impact of climate change and human activities,the decline in soil microbial diversity has become an indisputable fact.Exploring how changes in paddy soil microbial diversity affect Hg methylation can broaden our understanding of biological Hg methylation in rice ecosystem.In this study,the gradient dilution method was used to change the microbial diversity of paddy soil in Wanshan Hg mining area,and explored the impact of microbial diversity change on Hg methylation in paddy soil.The results showed that reduced microbial diversity reduces methylmercury generation potential,which may be attributed to a decrease in the relative abundance of Hg-methylating microorganisms due to the high cost of adaptation to Hg stress and an increase in the relative abundance of potential demethylating microorganisms due to their competitive advantage.This study provides experimental evidence that microbial diversity affects Hg methylation and highlights the importance of microbial community colonization on Hg methylation.
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