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Natural 13C and 15N abundance of field-collected fungi and their ecological implications

Published online by Cambridge University Press:  01 November 1999

A. KOHZU ,
T. YOSHIOKA ,
T. ANDO ,
M. TAKAHASHI ,
K. KOBA  and
E. WADA
A. KOHZU
Affiliation:
Center for Ecological Research, Kyoto University, Kyoto 606-8502, Japan
T. YOSHIOKA
Affiliation:
Institute for Hydrospheric–Atmospheric Sciences, Nagoya University, Nagoya 464-8601, Japan
T. ANDO
Affiliation:
Institute for Basin Ecosystem Studies, Gifu University, Yanagito 1-1, Gifu, 501-1112, Japan
M. TAKAHASHI
Affiliation:
Research Facility of the Wood Protection Wood Research Institute, Kyoto University, Uji, Kyoto 611-0011, Japan
K. KOBA
Affiliation:
Laboratory of Forest Ecology, Division of Environmental Science and Technology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8503, Japan
E. WADA
Affiliation:
Center for Ecological Research, Kyoto University, Kyoto 606-8502, Japan
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Abstract

The natural abundance of 13C and 15N was measured in basidiocarps of at least 115 species in 88 genera of ectomycorrhizal, wood-decomposing and litter-decomposing fungi from Japan and Malaysia. The natural abundance of 13C and 15N was also measured in leaves, litter, soil and wood from three different sites. 15N and 13C were enriched in ectomycorrhizal and wood-decomposing fungi, respectively, relative to their substrates. Ectomycorrhizal and wood-decomposing fungi could be distinguished on the basis of their δ13C and δ15N signatures. Although there was high variability in the isotopic composition of fungi, the following isotope- enrichment factors (ε, mean±SD) of the fungi relative to substrates were observed:

εectomycorrhizal fungi/litter = 6.1±0.4‰ 15N

εectomycorrhizal fungi/wood = 1.4±0.8‰ 13C

εwood-decomposing fungi/wood = −0.6±0.7‰ 15N

εwood-decomposing fungi/wood = 3.5±0.9‰ 13C

The basis of isotope fractionation in C metabolism from wood to wood-decomposing fungus is discussed.

Keywords

13C15Nbasidiocarpectomycorrhizal fungiwood-decomposing fungilitter-decomposing fungistable isotopes
Type
Research Article
Information
The New Phytologist , Volume 144 , Issue 2 , November 1999 , pp. 323 - 330
Copyright
© Trustees of the New Phytologist 1999

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