Estimation of the biomass of fine roots and mycorrhizal fungi: a case study in a Japanese red pine (Pinus densiflora) stand |
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Authors: | Satomura Takami Nakatsubo Takayuki Horikoshi Takao |
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Affiliation: | (1) Graduate School of Biosphere Sciences, Hiroshima University, Higashi-Hiroshima, Japan;(2) Faculty of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima, Japan;(3) Center for Ecological Research, Kyoto University, 509-3 Otsuka, Kamitanakami-hirano, Otsu, 520-2113, Japan |
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Abstract: | As part of a study on soil carbon flow in forest ecosystems, the biomass of fine roots (2.0mm in diameter) and root-associated fungi, including ectomycorrhizal fungi, were estimated in the summer season in 1998 at a Pinus densiflora (Japanese red pine) stand in western Japan. Fine roots of pine were classified into three categories: class I roots (0.5–2.0mm in diameter), long class II roots (long roots with diameter 0.5mm; IIL), and short class II roots (short roots with diameter 0.5mm; IIS). Total biomass of fine roots (I + IIL + IIS) at this stand was estimated to be 91.0gm–2, about 23% of which was class II roots (IIL + IIS). Ergosterol, which is a component of fungal membranes, was analyzed to estimate the biomass of root-associated fungi in roots. In the upper soil layers (from the surface to 13.4cm in depth), ergosterol contents in the class I, IIL and IIS roots were in the ranges 43.1–82.2, 126.1–196.3 and 271.2–321.0µgg–1 root DW, respectively. The ergosterol content was converted to fungal biomass using the median (minimum–maximum) value of ergosterol concentration reported for ectomycorrhizal fungi. Root-associated fungal biomass in this stand was estimated to be 2.0 (0.5–9.6) gm–2. The data suggest the biomass of ectomycorrhizal fungi in the P. densiflora stand is small compared with that in other forest ecosystems. |
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Keywords: | Carbon cycling Ectomycorrhiza Ergosterol Fine root Fungal biomass |
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