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

• Published in: Biotechnology and bioprocess engineering Vol. 22; no. 5; pp. 637 - 646
• Main Authors: Choi, Jung Hoon, Kim, Yun-Gon, Lee, Yoo Kyung, Pack, Seung Pil, Jung, Ji Young, Jang, Kyoung-Soon
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Society for Biotechnology and Bioengineering 01.09.2017; Springer Nature B.V; 한국생물공학회
• Subjects: Acidic soils; Arctic zone; Aromatic compounds; Biogeochemical cycles; Biotechnology; Carbon dioxide; Chemistry; Chemistry and Materials Science; Climate change; Cyclotron resonance; Decomposition; Dissolved organic matter; Fourier transforms; Global warming; Greenhouse effect; Greenhouse gases; High resolution; Industrial and Production Engineering; Ionization; Ions; Mass spectrometry; Mass spectroscopy; Microorganisms; Organic soils; Permafrost; Physical properties; Research Paper; Soil analysis; Soil depth; Soil investigations; Soil moisture; Soil organic matter; Soil profiles; Taiga & tundra; Thawing; Tundra; 생물공학; Arctic region; decomposability; dissolved organic matter; arctic tundra soil; FT-ICR MS; elemental composition
• ISSN: 1226-8372; 1976-3816
• DOI: 10.1007/s12257-017-0121-4

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 (CO 2 and CH 4 ) 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.