Large but variable methane production in anoxic freshwater sediment upon addition of allochthonous and autochthonous organic matter

Limnology and Oceanography
Charlotte GrassetSebastian Sobek

Abstract

An important question in the context of climate change is to understand how CH4 production is regulated in anoxic sediments of lakes and reservoirs. The type of organic carbon (OC) present in lakes is a key factor controlling CH4 production at anoxic conditions, but the studies investigating the methanogenic potential of the main OC types are fragmented. We incubated different types of allochthonous OC (alloOC; terrestrial plant leaves) and autochthonous OC (autoOC; phytoplankton and two aquatic plants species) in an anoxic sediment during 130 d. We tested if (1) the supply of fresh alloOC and autoOC to an anoxic refractory sediment would fuel CH4 production and if (2) autoOC would decompose faster than alloOC. The addition of fresh OC greatly increased CH4 production and the δ13C-CH4 partitioning indicated that CH4 originated exclusively from the fresh OC. The large CH4 production in an anoxic sediment fueled by alloOC is a new finding which indicates that all systems with anoxic conditions and high sedimentation rates have the potential to be CH4 emitters. The autoOC decomposed faster than alloOC, but the total CH4 production was not higher for all autoOC types, one aquatic plant species having values as low as the terrestria...Continue Reading

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Citations

Jul 31, 2019·Scientific Reports·Anastasija IsidorovaSebastian Sobek
Oct 11, 2019·Limnology and Oceanography·Charlotte GrassetSebastian Sobek
Jul 2, 2020·Bulletin of Environmental Contamination and Toxicology·Jing ChenYifan Xu
Aug 9, 2019·Environmental Science and Pollution Research International·Biao LiQinglong L Wu
Jul 19, 2020·Global Change Biology·Charlotte GrassetLars J Tranvik
Nov 7, 2019·Scientific Reports·Jörg TittelMatthias Koschorreck
Nov 21, 2020·The Science of the Total Environment·Lei ZhangZhaode Wang
Jan 18, 2021·The Science of the Total Environment·Lei ZhangJicheng Zhong
Mar 19, 2021·Water Research·Maciej BartosiewiczIsabelle Laurion
Aug 5, 2021·The Science of the Total Environment·Mahmood Sadat-NooriWilliam Glamore
Nov 29, 2021·The Science of the Total Environment·José R ParanaíbaSarian Kosten

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