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Characterization of Microbial Communities and Soil Organic Carbon Degradation Associated with the Depth and Thawing Effects on Tundra Soil in Alaska

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Title
Characterization of Microbial Communities and Soil Organic Carbon Degradation Associated with the Depth and Thawing Effects on Tundra Soil in Alaska
Other Titles
아북극 영구동토층 내 온도상승에 따른 미생물군집과 부식질분해활성의 변화 분석
Authors
Park, Ha Ju
Kim, Dockyu
Park, Hyun
Keywords
Arctic; Biodegradation; Bipolar; Climate change; Cold-adapted; Humic acids; Laccase; Soil organic carbon
Issue Date
2016
Citation
Park, Ha Ju, Kim, Dockyu, Park, Hyun. 2016. Characterization of Microbial Communities and Soil Organic Carbon Degradation Associated with the Depth and Thawing Effects on Tundra Soil in Alaska. ASM Microb 2016. 미국 보스턴. 2016.06.16~2016.06.20.
Abstract
In high-latitude regions, temperature has risen (0.6 C per decade) and this leads to the increase in microbial degradability against soil organic carbon (SOC). Furthermore, the decomposed SOC is converted into green-house gases and their release could further increase the rate of climate change. Thus, understanding the microbial diversity and their functions linked with SOC degradation in soil-thawing model is necessary. In this study, we divided tundra soil from Council, Alaska into two depth regions (30?40 cm and 50?60 cm of depth, designated as SPF and PF, respectively) and incubated that for 108 days at 0 C. A total of 111,804 reads were obtained through a pyrosequencing-based metagenomic study during the microcosm experiments, and 574-1,128 of bacterial operational taxonomic units (OTUs) and 30-57 of archaeal OTUs were observed. Taxonomic analysis showed that the distribution of bacterial taxa was significantly different between two samples. In detail, the relative abundance of phyla Actinobacteria and Firmicutes largely increased in SPF and PF soil, respectively, while phyla Crenarchaeota was increased in both soil samples. Weight measurement and gel permeation chromatography of the SOC extracts demonstrated that polymerization of humic acids, main component of SOC, occurred during the microcosm experiments. Taken together our results indicate that these bacterial and archaeal phyla could play a key function in SOC degradation and utilization in cold tundra soil.
URI
http://repository.kopri.re.kr/handle/201206/7160
Conference Name
ASM Microb 2016
Conference Place
미국 보스턴
Conference Date
2016.06.16~2016.06.20
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