Fungal content of ectomycorrhizal tips: comparison among 13 tree species

  • Kinoshita Akihiko
    Graduate School of Biosphere Sciences, Hiroshima University
  • Satomura Takami
    Graduate School of Biosphere Sciences, Hiroshima University Field Science Center for Northern Biosphere, Hokkaido University
  • Hashimoto Yasushi
    Agro-Environmental Science, Obihiro University of Agriculture and Veterinary Medicine
  • Horikoshi Takao
    Graduate School of Integrated Arts and Sciences, Hiroshima University

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<p>To better understand soil carbon cycling in forest ecosystems, we studied the proportion of fungal sheath area (FSA) in the cross-sectional ectomycorrhizal area in 13 tree species. Ectomycorrhizal samples were collected from subalpine and temperate forests in Japan. The FSA values were in the range of 12% to 56% across all tree species, tree ages, and fungal species. In Abies firma and Quercus serrata, the FSA values were larger in mature trees than in seedlings, whereas no such differences were found in Pinus densiflora and Fagus crenata. In broad-leaved trees, because the plant tissue radii lay within a narrow range, the FSA was affected mainly by the fungal sheath thickness. In conifers, however, the plant tissue radii varied widely among genera, so the FSA was affected by both the plant tissue radius and the fungal sheath thickness. Our findings suggest that the fungal content of ectomycorrhizal tips differs among tree species and fungal species, so that both parameters must be considered in studies of forest carbon cycling. The estimates revealed that data gathering in each type of forest leads to more accurate estimates of the biomass of fungi in ectomycorrhizal tips.</p>


  • Mycoscience

    Mycoscience 48 (3), 160-168, 2007

    The Mycological Society of Japan


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