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Molecular characterization of soil organic matter along a soil chronosequence in Midtre Lovenbreen foreland in Svalbard

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Title
Molecular characterization of soil organic matter along a soil chronosequence in Midtre Lovenbreen foreland in Svalbard
Other Titles
다산기지 주변 중앙로벤브린 빙하 후퇴 시기에 따른 토양 유기물 화학적 특성 연구
Authors
Nam, Sungjin
Jung, Ji Young
Lee, Yoo Kyung
Kim, Se Eun
Jeong, Sujeong
Issue Date
2016
Citation
Nam, Sungjin, et al. 2016. Molecular characterization of soil organic matter along a soil chronosequence in Midtre Lovenbreen foreland in Svalbard. 22nd International Symposium on Polar Sciences. 극지연구소. 2016.05.10~2016.05.11.
Abstract
Glacier forelands give an opportunity to study the successional processes in the terrestrial ecosystem along the chronosequence at a time, since the ice covers of glacier have receded over the past century. The newly exposed soil gives chances for plants and microorganisms to be established, and these organisms contribute to build up the soil organic matter (SOM) pool in this region. To investigate molecular compositions of SOM along a soil chronosequence, we took the surface soil samples at 0?5 cm depth in the glacier foreland of Midtre Lovenbreen, Svalbard in 2014. Seven sampling sites inside the moraine represented soil ages as 3, 8, 36, 57, 65, 70, and 77 years (sites 1 ? 7, respectively). Two sites outside the moraine (sites 8, 9) were also selected as a reference. Before soil sampling, vegetation composition and coverage were surveyed. Since SOM is a mixture of materials showing various turnover time, and the content of SOM was very low in the glacier foreland, density-size based SOM fractionation was used. Firstly, sodium polytungstate solution (1.55 g cm-3) was used to separate soil into the free light fraction (FLF) which floats on the solution and the heavy fraction (HF) which sinks. Secondly, the HF was further separated as the sand-size fraction and silt and clay-size fraction based on size. Molecular composition of FLF which mostly consisting of recently added organic matter was analyzed by pyrolysis-Gas Chromatography/Mass Spectrometry (py-GC/MS) and TMAH(tetramethyl-ammonium hydroxide)-py-GC/MS at two pyrolysis temperatures (350 and 600 °C). The sand-sized and silt and clay sized fractions were treated with hydrofluoric acid to increase carbon concentration by removing mineral particles and analyzed by py-GC/MS at two temperatures (350 and 600 °C). We are currently analyzing molecular characteristics of SOM from these samples. The results of this study could provide better understanding of molecular composition of SOM, successional processes, and the relationships between SOM composition and vegetation in a newly exposed glacier foreland.
URI
https://repository.kopri.re.kr/handle/201206/7157
Conference Name
22nd International Symposium on Polar Sciences
Conference Place
극지연구소
Conference Date
2016.05.10~2016.05.11
Type
Poster
Indexed
포스터
Appears in Collections  
2015-2016, Analytical method development for soil organic matter in the Arctic (15-16) / Jung, Ji Young (PE15160)
2014-2016, Environmental Change Studies Based on The Arctic Dasan Station: in terms of Geology, Atmospheric Science, and Ecology (14-16) / Lee; Yookyung (PE14030; PE15030; PE16030)
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