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Ectomycorrhizal Communities on Tree Roots and in Soil Propagule Banks along a Secondary Successional Vegetation Gradient

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Abstract:

Changes in the composition of underground ectomycorrhizal communities along a secondary successional vegetation gradient were investigated in Kashiwa City, Kanto District, eastern Japan. Soil cores were sampled from the surface soils of six plots in a successional series of vegetation, and ectomycorrhizal root tips were classified into morphotypes by macroscopic observation and measurement of the internal transcribed spacer 3–4 length of rDNA. The inoculum potential of ectomycorrhizal fungi in the soils was also investigated by germinating and growing Japanese red pine seedlings in pots. The species richness of ectomycorrhizal fungi on tree roots increased along the successional gradient from the pioneer tree stage (Pinus densiflora Sieb. et Zucc. stands) to the middle stage (deciduous Quercus serrata Thunb. and Castanea crenata Sieb. stands) and then slightly decreased in the climax stage (evergreen Quercus myrsinaefolia Bl. stands). The increase in the number of ectomycorrhizal morphotypes was strongly correlated with the increase in the biomass of ectomycorrhizal trees along the succession. Ectomycorrhizal propagule banks were found in the soil of pioneer grass- and shrublands where ectomycorrhizal trees were not present. Unlike the diversity of ectomycorrhizal morphotypes on tree roots, the morphotype richness and diversity of ectomycorrhizal inocula in the soil infective to pine seedlings increased only from the grassland to the pine successional stage and not in the deciduous and evergreen-oak stages. The composition of ectomycorrhizal communities on mature trees and ectomycorrhizal propagule banks in soils showed a successional gradient along the secondary vegetation gradient, but many common morphotypes were present among the different vegetation stages.

Keywords: Pinus densiflora; Quercus spp; ectomycorrhiza; secondary succession; species richness

Document Type: Research Article

Publication date: 2007-12-01

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  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
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