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Title: Application of 13C NMR spectroscopy to characterize organic chemical components of decomposing coarse woody debris from different climatic regions
Authors: Hishinuma, Takuya
Osono, Takashi
Fukasawa, Yu
Azuma, Jun-ichi
Takeda, Hiroshi
Author's alias: 大園, 享司
Keywords: Carbon-13 nuclear magnetic resonance spectroscopy
coarse woody debris
lignin
decomposition
wood
Issue Date: 31-Mar-2015
Publisher: Forest Research and Management Institute ICAS
Journal title: Annals of Forest Research
Volume: 58
Issue: 2
Start page: 3
End page: 13
Abstract: Solid-state 13C nuclear magnetic resonance (NMR) spectroscopy was applied to coarse woody debris (CWD) in different stages of decomposition and collected from forest floor of a subtropical, a cool temperate, and a subalpine forest in Japan. The purpose was to test its applicability to characterize organic chemical composition of CWD of broad-leaved and coniferous trees from different climatic conditions. O-alkyl-C, mainly representing carbohydrates, was the predominant component of CWD at the three sites, accounting for 43.5-58.1% of the NMR spectra. Generally, the relative area under the signals for aromatic-C and phenolic-C, mainly representing lignin, increased, whereas the relative area for O-alkyl-C decreased, as the decay class advanced. The relative area under NMR chemical shift regions was significantly correlated with the chemical properties examined with proximate analyses. That is, O-alkyl-C and di-O-alkyl-C NMR signal areas were positively correlated with the volumetric density of CWD and the content of total carbohydrates. Methoxyl-C, aromatic-C, phenolic-C, carboxyl-C, and carbonyl-C were positively correlated with the contents of acid-unhydrolyzable residues (lignin, tannins, and cutin) and nitrogen. Lignin-C calculated from NMR signals increased, and polysaccharide-C decreased, with the decay class of CWD at the three study sites. A review of previous studies on 13C NMR spectroscopy for decomposing CWD suggested further needs of its application to broad-leaved trees from tropical and subtropical regions.
Rights: All the papers published in Annals of Forest Research are available under an open access policy (Gratis Gold Open Access License), which guaranty the free (of taxes) and unlimited access, for anyone, to entire content of the all published articles.
URI: http://hdl.handle.net/2433/200680
DOI(Published Version): 10.15287/afr.2015.356
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