Decay Types and Fungal Communities of Norway Spruce Dead Wood in Europe

概要

Poster
Poster 6

Decay Types and Fungal Communities of Norway Spruce
Dead Wood in Europe
Yuki KAWASAKI1, Shunsuke MATSUOKA2, Hirotoshi SATO2, Václav POUSKA3, Jenni NORDÉN4,
Olga ORMAN5, Radek BAČE3, Momchil PANAYOTOV6, Nickolay TSVETANOV6, Martin MIKOLÁŠ3,
Lucie ZÍBAROVÁ7, Angelos PAPADIMITRIOU8, Elias POLEMIS9, Kamil KRÁL10,
Miroslav SVOBODA3 and Yu FUKASAWA1
1

Graduate School of Agricultural Science, Tohoku University, Japan
2
Kyoto University, Japan
3
Czech University of Life Sciences Prague, Czech Republic
4
Norwegian Institute for Nature Research, Norway
5
University of Agriculture Krakow, Poland
6
University of Forestry, Bulgaria
7
Personal, Czech Republic
8
Personal
9
Agricultural University of Athens, Greece
10
The Silva Tarouca Research Institute for Landscape and Ornamental Gardening, Czech Republic

Fungi are the major decomposers of dead wood in forest ecosystems. Differences in fungal community structure affect the
lignin decomposition of dead wood through differences in ligninolytic enzyme profiles of the fungal species in the community.
Such differences in decomposition patterns are expected to affect carbon stocks in forests. Therefore, it is important to understand
the driving factors and functions of wood-inhabiting fungi (WIF) communities in dead wood, and how they may respond to
environmental changes. In this study, we investigated the relationship between fungal community composition and environmental
variables in dead wood of Norway spruce (Picea abies) across the latitudinal gradient in Europe.
We sampled 374 dead Norway spruce logs from forests in six sites in five European countries along the latitudinal gradient. DNA
metabarcoding was used to examine the fungal community structure of each log, and the functions of the fungal species that compose
the community were estimated by the FUNGuild database. In this study, we also quantitatively evaluated the decay type of dead
woods by using the Dilute Alkali Solubility (DAS) method, which is a method for quantifying and evaluating the chemical changes
associated with the decomposition and alteration of lignocellulose in dead woods. The value of DAS (%) tends to be higher in the
brown rot decay type, in which lignin remains with little modification.
DNA metabarcoding identified 1408 OTUs, of which 18 OTUs were brown rot fungi. The structure of the fungal community
varies across a climatic gradient, DAS (%), an index of brown rot, was significantly correlated with mean annual temperature.
The frequency of occurrence of brown rot fungi was positively correlated with DAS and annual mean temperature. These results
suggested that the frequency of brown rot may increase with temperature as some species of brown rot fungi, which are sensitive to
the site environment, become more dominant in a warmer temperature.

Photo. Norway spruce forest

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