Assessment of CH4 oxidation in tidal flat sediments

Title
Assessment of CH4 oxidation in tidal flat sediments
Author(s)
강정원; 현상민
KIOST Author(s)
Kang, Jeong Won(강정원)Hyun, Sangmin(현상민)
Publication Year
2018-11-03
Abstract
In tidal flats that lack plants, methane (CH4) fluxes are both positive (gas emission) and negative (gas “sinking”) in nature. The levels of methanotroph populations significantly affect the extent of CH4 sinking. The chamber was deployed over decapods (mud shrimp, Laomedia astacina and crab, Macrophthalmus japonicus) burrows for ~ 2 h, and the CH4 and CO2 concentrations were continuously monitored using a closed, diffuse CH4/CO2 flux meter. We found that Laomedia astacina burrow (which is relatively long) site afforded higher-level CH4 production, likely due to diffusive emission of CH4 in deep-layer sediments. In addition, the large methanotrophic bacteria population found in the burrow wall sediments has CH4 oxidation (consumption) potential. Especially, nitrite-driven anaerobic oxidation of methane (AOM) may occur within burrows. The proposed CH4-oxidation process was supported by the decrease in the δ13C of headspace CO2 during the chamber experiment. over decapods (mud shrimp, Laomedia astacina and crab, Macrophthalmus japonicus) burrows for ~ 2 h, and the CH4 and CO2 concentrations were continuously monitored using a closed, diffuse CH4/CO2 flux meter. We found that Laomedia astacina burrow (which is relatively long) site afforded higher-level CH4 production, likely due to diffusive emission of CH4 in deep-layer sediments. In addition, the large methanotrophic bacteria population found in the burrow wall sediments has CH4 oxidation (consumption) potential. Especially, nitrite-driven anaerobic oxidation of methane (AOM) may occur within burrows. The proposed CH4-oxidation process was supported by the decrease in the δ13C of headspace CO2 during the chamber experiment.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/22909
Bibliographic Citation
2018 한국환경과학회 정기학술대회, pp.1 - 2, 2018
Publisher
한국환경과학회
Type
Conference
Language
English
Publisher
한국환경과학회
Related Researcher
Research Interests

sediment chemistry,atmospheric chemistry,Chemical Oceanography,퇴적물화학,대기화학,해양화학

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