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International Journal of Wildland Fire International Journal of Wildland Fire Society
Journal of the International Association of Wildland Fire
RESEARCH ARTICLE

Molecular composition of soil dissolved organic matter in recently-burned and long-unburned boreal forests

Jun’ichiro Ide https://orcid.org/0000-0002-0992-7318 A G , Mizue Ohashi B , Kajar Köster C , Frank Berninger C D , Ikumi Miura B , Naoki Makita E , Keitaro Yamase F , Marjo Palviainen C and Jukka Pumpanen D
+ Author Affiliations
- Author Affiliations

A Institute of Decision Science for a Sustainable Society, Kyushu University, Fukuoka 811-2415, Japan.

B School of Human Science and Environment, University of Hyogo, Hyogo 670-0092, Japan.

C Department of Forest Sciences, University of Helsinki, Helsinki 00014, Finland.

D Department of Environmental and Biological Sciences, University of Eastern Finland, Kuopio 70211, Finland.

E Faculty of Science, Shinshu University, Nagano, 390-8621, Japan.

F Forestry and Forest Products Research Institute, Hyogo Prefectural Technology Center for Agriculture, Forestry and Fisheries, Hyogo 671-2515, Japan.

G Corresponding author. Email: ide.junichiro@gmail.com

International Journal of Wildland Fire 29(6) 541-547 https://doi.org/10.1071/WF19085
Submitted: 11 June 2019  Accepted: 9 January 2020   Published: 13 February 2020

Abstract

Forest fires can change the quality of dissolved organic matter (DOM) in soils, and consequently have a great influence on biogeochemical cycles in forest ecosystems. However, little information is available regarding the effects of fire on the chemical composition of DOM in boreal forest soils. To clarify these effects, the molecular composition of soil DOM was compared between recently-burned and long-unburned boreal forests (6 and 156 years since the last fire, respectively) in Finnish Lapland. Ultrahigh-resolution Fourier transform ion cyclotron resonance mass spectrometry revealed that there were no significant differences in species, average molecular weight or the number of molecular compounds detected between the recently-burned and long-unburned forests. However, the number of compounds with condensed aromatic structures tended to be larger in the recently-burned forest, whereas the numbers of proteins and carbohydrates not shared between the two forests were significantly smaller. Lignin-like molecules accounted for most of the total molecular species in both forests. Our results suggest that fire not only generated several species of dissolved black carbon, but also caused burned plant residues, which supplied diverse lignin-like molecules in the recently-burned forest soils and led to the number of molecular species being comparable to that in the long-unburned forest soils.

Additional keywords: biomolecules, natural forest, soil water, succession, Värriö Strict Nature Reserve.


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