Distribution of ectomycorrhizas and ectomycorrhizal fungal inoculum with soil depth in a birch forest |
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| Authors: | Yasushi Hashimoto Mitsuro Hyakumachi |
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| Institution: | (1) United Graduate School of Agricultural Science, Gifu University, 501-1193 Gifu, Japan;(2) Institute of Genetic Ecology, Tohoku University, 980-8577 Sendai, Japan;(3) Laboratory of Plant Disease Science, United Graduate School of Agricultural Science, Gifu University, Yanagido 1-1, 501-1193 Gifu, Japan |
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| Abstract: | The distributions of ectomycorrhizas and ectomycorrhizal fungal inoculum with soil depth (0–45 cm) were determined in a 40-year-oldBetula platyphylla var.japonica forest. Mycorrhizal and non-mycorrhizal fine roots were measured in each soil core sample that was collected at soil depths
of 0–5, 5–10, 10–15, 15–20, 20–25, 30–35, and 40–45 cm. The ectomycorrhizas were mainly distributed (>50%) in the top soil
(0–5 cm) of organic forest floor horizons. Below 5 cm the quantity of ectomycorrhizas decreased sharply. The percentage of
fine roots which were ectomycorrhizal gradually declined with the depth of soil. The ectomycorrhizal fungal inoculum was evaluated
by a bioassay method, measuring the lengths of the entire root system and of the ectomycorrhizal roots of birch seedlings
planted in each soil sample. The soil samples were collected from 0–5, 10–15, 20–25, 30–35, and 40–45 cm depths of the soil
profile. Ectomycorrhizal formation on birch seedling roots in the bioassay was high in both the soil depth intervals 0–5 cm
and 10–15 cm, while the amount was lower in the soil depth interval from 20–45 cm. The results of these investigations show
that the amount of the ectomycorrhizas in soil, and the ectomycorrhizal fungal inoculum potential as determined by bioassay,
are not always consistent with each other. |
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| Keywords: | Betula platyphylla var japonica bioassay ectomycorrhizas fine root vertical distribution |
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