Decomposition of small diameter woody debris of red fir determined by nuclear magnetic resonance
作者:
JohnG. McCoII,
RobertF. Powers,
期刊:
Communications in Soil Science and Plant Analysis
(Taylor Available online 1998)
卷期:
Volume 29,
issue 17-18
页码: 2691-2704
ISSN:0010-3624
年代: 1998
DOI:10.1080/00103629809370144
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Red fir (Abies magnificaA. Murr.) woody debris decomposing for 17 years in untreated (Control) and nitrogen‐fertilized plus widely thinned (NT2) plots was examined by13C nuclear magnetic resonance (NMR). Total carbon (C) and total N concentrations were also determined. Combined data of wood and bark showed correlations between carboxylic, aromatic, O‐alkyl and aliphatic C fractions, and C fractions with C/N, but phenolic and methoxyl correlations were non‐significant. Wood mass losses averaged 38% for both Controls and NT2. Bark mass losses were 61% for Controls and 66% for NT2, but these were not significantly different at p<0.05; bark sloughing added considerable variance. Wood in Controls decreased O‐alkyl (66 to 50%) and aromatic (16 to 13%), increased carboxyl (1.5 to 6.5%) and aliphatic (2.0 to 15.5%), and decreased Cm/Lm, i.e., carbohydrate/lignin monomers (2.78 to 1.82). In NT2 plots, open crowns allowed greater drying of the forest floor during warm, dry summers. The C/N averages were slightly lower in NT2 than in Controls for wood (167 versus 188), and the same for bark (45 and 43), but differences were not significant at p<0.05. Decompositional pathways in different environments, by brown‐rot and whiterot fungi, are discussed.
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