Microbial genes for degrading plant-derived carbon are a key factor affecting soil respiration and temperature sensitivity in plateau peatlands

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外文标题：Microbial genes for degrading plant-derived carbon are a key factor affecting soil respiration and temperature sensitivity in plateau peatlands

外文摘要：Peatlands on the southwestern plateau of China are important carbon sinks for high-altitude terrestrial ecosystems in Asia.However,the specific microecological mechanism responsible for alterations in carbon processes in this region due to the simultaneous impacts of global warming and drought has not been fully elucidated.Investigating this mechanism will improve our understanding of carbon cycle feedback in peatland ecosystems,as it is affected by changes in hydrology and temperature,especially in vulnerable habitats.This study examined the influence of soil carbon decomposition functional microorganisms on soil respiration and temperature sensitivity(expressed as Q10)in high-elevation peatlands using field investigations,simulated warming experiments,and metagenomic sequencing.We found that hydrothermal conditions had a significant effect on soil respiration,leading to an increase in cumulative soil respiration as soil moisture and temperature increased.Soil moisture affected soil respiration and soil organic carbon mainly through soil microorganisms,with a predominance of carbon-decomposing genes.We found that genes regulating the decomposition of plant-derived carbon such as cellulose and lignin were the critical factor influencing Q10 in peatlands.Genes involved in cellulose and lignin decomposition showed a significant positive correlation with Q10(P＜0.05),while genes involved in hemicellulose decomposition showed a significant negative correlation with Q10(P＜0.05).Specifically,genes such as ACO,xylF,and hpaE,which are involved in lignin decomposition,and glgB,which is responsible for cellulose decomposition,showed significant positive correlations(P＜0.05)with Q10 Conversely,the gene uxaC,involved in the decomposition of hemicellulose,showed a significant negative correlation(P＜0.05)with Q10..Finally,we analyzed the relevant carbon metabolic pathways and found that although they were affected by water,they were not significantly related to Q10.In short,this research highlights the importance of microorganisms with genes for decomposing plant-derived carbon in influencing carbon emissions in plateau peatlands during periods of warming.

外文关键词：

carbon decompositioncarbon metabolic pathwaydrought stressfunctional genesglobal warmingligninmetagenomic sequencingmicroorganisms

作者：

Wei JIANG、Mingyao XIONG、Shuzhen ZOU、Di KANG

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作者单位：

Key Laboratory of Southwest China Wildlife Resources Conservation(Ministry of Education),China West Normal University,Nanchong 637009(China)

Key Laboratory of Environmental Science and Biodiversity Conservation(Sichuan Province),China West Normal University,Nanchong 637009(China)

关键词：

carbon decomposition carbon metabolic pathway drought stress functional genes global warming lignin metagenomic sequencing microorganisms

出版年：

2024

DOI：

10.1016/j.pedsph.2024.07.003

土壤圈(英文版)

中国土壤学会,中科院南京土壤研究所和土壤与农业可持续发展国家重点实验室

土壤圈(英文版)

CSTPCD

影响因子：0.477

ISSN：1002-0160

年,卷(期)：2024.34(6)