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Chemical characterization of dissolved organic matter in moist acidic tussock tundra soil using ultra-high resolution 15T FT-ICR mass spectrometry

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Title
Chemical characterization of dissolved organic matter in moist acidic tussock tundra soil using ultra-high resolution 15T FT-ICR mass spectrometry
Other Titles
15T FT-ICR Mass spectrometry를 이용한 알래스카 투석 툰드라 토양 내 용존유기물의 화학적 특성 분석
Authors
Choi, Jung Hoon
Pack, Seung Pil
Jang, Kyoung-Soon
Jung, Ji Young
Lee, Yoo Kyung
Kim, Yun-Gon
Subject
Biotechnology & Applied Microbiology
Keywords
FT-ICR MS; arctictundra soil; decomposability; dissolved organic matter; elemental composition
Issue Date
2017
Citation
Choi, Jung Hoon, et al. 2017. "Chemical characterization of dissolved organic matter in moist acidic tussock tundra soil using ultra-high resolution 15T FT-ICR mass spectrometry". BIOTECHNOLOGY AND BIOPROCESS ENGINEERING, 22(5): 637-646.
Abstract
Global warming is considered one of the most serious environmental issues, substantially mediating abrupt climate changes, and has stronger impacts in the Arctic ecosystems than in any other regions. In particular, thawing permafrost in the Arctic region with warming can be strongly contributing the emission of greenhouse gases (CO2 and CH4) that are produced from microbial decomposition of preserved soil organic matter (SOM) or are trapped in frozen permafrost soils, consequently accelerating global warming and abrupt climate changes. Therefore, understanding chemical and physical properties of permafrost SOM is important for interpreting the chemical and biological decomposability of SOM. In this study, we investigated dissolved organic matter (DOM) along the soil depth profile in moist acidic tussock tundra to better understand elemental compositions and distributions of the arctic SOM to evaluate their potential decomposability under climate change. To achieve ultra-high resolution mass profiles, the soil extracts were analyzed using a 15 Tesla Fourier transform ion cyclotron resonance mass spectrometer in positive and negative ion modes via electrospray ionization. The results of this analysis revealed that the deeper organic soil (2Oe1 horizon) exhibits less CHON class and more aromatic class compounds compared to the surface organic soils, thus implying that the 2Oe1 horizon has undergone a more decomposition process and consequently possessed the recalcitrant materials. The compositional features of DOM in the Arctic tundra soils are important for understanding the changes in biogeochemical cycles caused from permafrost changes associated with global warming and climate change.
URI
http://repository.kopri.re.kr/handle/201206/6180
DOI
http://dx.doi.org/10.1007/s12257-017-0121-4
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