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A study of Arctic Microbial Community Structure Response to Increased Temperature and Precipitation by Phospholipid Fatty Acid Analysis

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Title
A study of Arctic Microbial Community Structure Response to Increased Temperature and Precipitation by Phospholipid Fatty Acid Analysis
Other Titles
인지질 지방산을 이용한 기온 상승과 강수량 증가 모사 실험에 따른 북극 미생물 군집 구조 변화 연구
Authors
Nam, Sungjin
Jung, Ji Young
Keywords
Climate changeHigh arcticMicrobial biomassPhospholipid fatty acid analysisSoil depthTemporal changes
Issue Date
2023
Citation
Nam, Sungjin, Jung, Ji Young. 2023. "A study of Arctic Microbial Community Structure Response to Increased Temperature and Precipitation by Phospholipid Fatty Acid Analysis". Proceedings of the National Institute of Ecology of the Republic of Korea (PNIE), 4(2): 86-94.
Abstract
Climate change is more rapid in the Arctic than elsewhere in the world, and increased precipitation and warming are expected cause changes in biogeochemical processes due to altered microbial communities and activities. It is crucial to investigate microbial responses to climate change to understand changes in carbon and nitrogen dynamics. We investigated the effects of increased temperature and precipitation on microbial biomass and community structure in dry tundra using two depths of soil samples (organic and mineral layers) under four treatments (control, warming, increased precipitation, and warming with increased precipitation) during the growing season (June-September) in Cambridge Bay, Canada (69°N, 105°W). A phospholipid fatty acid (PLFA) analysis method was applied to detect active microorganisms and distinguish major functional groups (e.g., fungi and bacteria) with different roles in organic matter decomposition. The soil layers featured different biomass and community structure; ratios of fungal/bacterial and gram-positive/-negative bacteria were higher in the mineral layer, possibly connected to low substrate quality. Increased temperature and precipitation had no effect in either layer, possibly due to the relatively short treatment period seven years) or the ecosystem type. Mostly, sampling times did not affect PLFAs in the organic layer, but June mineral soil samples showed higher contents of total PLFAs and PLFA biomarkers for bacteria and fungi than those in other months. Despite the lack of response found in this investigation, long-term monitoring of these communities should be maintained because of the slow response times of vegetation and other parameters in high-Arctic ecosystems.
URI
https://repository.kopri.re.kr/handle/201206/16004
DOI
http://dx.doi.org/10.22920/PNIE.2023.4.2.86
Type
Article
Station
기타()
Indexed
국내기타
Appears in Collections  
2018-2018, Arctic permafrost environment change monitoring and prediction method developments (18-18) / Lee, Bang Yong (PN18081)
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