Carbon Cycle in Lei-Gong-Huo Mud Volcano of Eastern Taiwan
Date Issued
2014
Date
2014
Author(s)
Sung, Yi-Chun
Abstract
Anaerobic Oxidation of Methane (AOM) has been widely discovered in methane-rich environments. In marine mud volcanoes and cold seep environments, the AOM activity could enhance the quantity and change the isotopic composition of organic and inorganic carbon in pore water and sediments. Apparently, the AOM activity not only consume deep-sourced methane and produce authigenic carbonates, but also transform dead carbon to organic carbon which becomes a new energy sources for other microorganisms.
The AOM activity in terrestrial mud volcanoes has not been well studied. Previous geochemical and molecular studies have shown that an iron-coupled AOM occurred in core sediments of Lei-Gong-Huo mud volcano (LGHMV) in eastern Taiwan and furthermore investigation of its characteristics of carbon cycle is expected. In order to reveal the role of AOM and other microbial activities in carbon cycle, the abundance and d13C values of organic/inorganic carbon of bubbling fluid and core sediments were analyzed.
The results indicate that the spatial and temporal variations of microbial communities and carbon dymanics are significant in core sediments. Although the AOM plays a critical role in all sampling sites near bubbling pools, other microorganisms, including heterotrophs, phototrophs and methanogens, are also important to overall carbon cycle. The distribution of organic carbon in core sediments can be divided into three types. Each type shows a distinguishable pattern and is contributed by different microbial processes. Overall, the differences in abundance and d13C values of different carbon compounds in core sediments result from the dynamic variation of complexly structured microbial communities. Further evaluation of environmental controls and regulations on microbial communities may provide a clue to deeply understand the carbon cycle in LGHMV.
Subjects
雷公火
泥火山
碳循環
厭氧型甲烷氧化作用
穩定同位素分析
SDGs
Type
thesis
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