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Title: Spatial variations in the molecular diversity of dissolved organic matter in water moving through a boreal forest in eastern Finland
Authors: Ide, Jun’ichiro
Ohashi, Mizue
Takahashi, Katsutoshi
Sugiyama, Yuko
Piirainen, Sirpa
Kortelainen, Pirkko
Fujitake, Nobuhide
Yamase, Keitaro
Ohte, Nobuhito  kyouindb  KAKEN_id  orcid (unconfirmed)
Moritani, Mina
Hara, Miyako
Finér, Leena
Author's alias: 大手, 信人
Issue Date: 10-Feb-2017
Publisher: Springer Nature
Journal title: Scientific Reports
Volume: 7
Thesis number: 42102
Abstract: Dissolved organic matter (DOM) strongly affects water quality within boreal forest ecosystems. However, how the quality of DOM itself changes spatially is not well understood. In this study, to examine how the diversity of DOM molecules varies in water moving through a boreal forest, the number of DOM molecules in different water samples, i.e., rainwater, throughfall, soil water, groundwater, and stream water was determined using Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) in Norway spruce and Scots pine stands in eastern Finland during May and June 2010. The number of molecular compounds identified by FT-ICR MS (molecular diversity) ranged from 865 to 2, 194, revealing large DOM molecular diversity in the water samples. Additionally, some of the molecular compounds were shared between different water samples. The DOM molecular diversity linearly correlated with the number of low-biodegradable molecules, such as, lignin-like molecules (lignins), but not with dissolved organic carbon concentration. The number of lignins shared between different sampling locations was larger than that of any other biomolecular class. Our results suggest that low-biodegradable molecules, especially lignins, regulate spatial variations in DOM molecular diversity in boreal forests.
Rights: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
DOI(Published Version): 10.1038/srep42102
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