Application of 13C NMR spectroscopy to characterize organic chemical components of decomposing coarse woody debris from different climatic regions

T. Hishinuma, T. Osono, Y. Fukasawa, Jun Ichi Azuma, H. Takeda

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

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. Keywords Carbon-13 nuclear magnetic resonance spectroscopy, coarse woody debris, lignin, decomposition, wood.

Original languageEnglish
Pages (from-to)3-13
Number of pages11
JournalAnnals of Forest Research
Volume58
Issue number1
DOIs
Publication statusPublished - 2015

Keywords

  • Carbon-13 nuclear magnetic resonance spectroscopy
  • Coarse woody debris
  • Decomposition
  • Lignin
  • Wood

ASJC Scopus subject areas

  • Forestry
  • Ecology
  • Plant Science

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