Potential transformation of organic matter by microbes in cryoconite,Tibetan Plateau

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外文摘要：Microorganisms play an essential role in the glacier carbon cycle;how they transform organic matter in mountain glacial cryoconite remains to be studied.Here,we applied ultra-high resolution Fourier transform ion cyclotron resonance mass spectrometry(FT-ICR MS)and deep sequencing of 16S rRNA gene,to investigate the temporal microbial transformation of dissolved organic matter(DOM)of the Tibetan Plateau cryoconite.During the 60-day incubation,we found that DOM in cryoconite underwent a three-stage transformation,with decreasing bioavailability over time.The microbial community did not change much in the first week while degrading DOM molecules that were associated with higher H/Cwa and lower O/Cwa.During days 15-30,DOM composition remained stable while microbial diversity increased.By day 60,the DOM was microbially converted into a higher state of recalcitrance,with higher values of aromatic index,O/Cwa and lower H/Cwa,which contained molecules containing more heteroatoms.Cooperation among various microbial taxa,like Cyanobacteria,Bacteroidota,Gam-maproteobacteria,Firmicutes,and Actinobacteriota,drove the DOM transformation in cryoconite.This study sheds light on the in-situ transformation of DOM composition meditated by microbial populations in cryoconite at a temporal scale,providing new insights into understanding the microbial roles in the glacier organic carbon transformation.

外文关键词：

CryoconiteDissolved organic matterBiodegradationMicrobial communityTemporal variation

作者：

Bixi GUO、Yongqin LIU、Kevin Xu ZHONG、Quan SHI、Chen HE、Qiang ZHENG、Ruanhong CAI

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作者单位：

State Key Laboratory of Tibetan Plateau Earth System,Environment and Resources(TPESER),Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China

Center for the Pan-Third Pole Environment,Lanzhou University,Lanzhou 730000,China

Department of Earth,Ocean,and Atmospheric Sciences,University of British Columbia,Vancouver,BC V6T 1Z4,Canada

State Key Laboratory of Heavy Oil Processing,Petroleum Molecules Engineering Center(PMEC),China University of Petroleum,Beijing 102249,China

State Key Laboratory for Marine Environmental Science,Collage of Ocean and Earth Sciences,Xiamen University,Xiamen 361102,China

Fujian Key Laboratory of Marine Carbon Sequestration,Xiamen University,Xiamen 361005,China

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaSecond Tibetan Plateau Scientific Expedition and Research Program(STEP)

项目编号：

42201147U21A20176423304102019QZKK0503

出版年：

2024

DOI：

10.1007/s11430-023-1270-0

中国科学:地球科学(英文版)

中国科学院

中国科学:地球科学(英文版)

影响因子：1.002

ISSN：1674-7313

年,卷(期)：2024.67(6)