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>Structure and regeneration ofFraxinus spaethiana-Pterocarya rhoifoliaforests in unstable valleys in the Chichibu Mountains, central Japan
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Structure and regeneration ofFraxinus spaethiana-Pterocarya rhoifoliaforests in unstable valleys in the Chichibu Mountains, central Japan
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机译：Structure and regeneration ofFraxinus spaethiana-Pterocarya rhoifoliaforests in unstable valleys in the Chichibu Mountains, central Japan
The structure of temperate deciduous forests dominated byFraxinus spaethianaandPterocarya rhoifoliain V-shaped valleys in the Chichibu Mountains, central Japan was studied to clarify their dynamics, with special reference to disturbance. Forest structure and annual ring analysis revealed that the forests have been subjected to mass movement (mud flow) in the past. The size and age structure, and diameter growth curves, indicated thatF. spaethianais relatively shade tolerant, long living and slow-growing, whileP. rhoifoliais less shade tolerant, short living, but fast growing.Pterocarya rhoifoliaappears to depend on large-scale but rare disturbances.Fraxinus spaethianaestablishes its seedlings on relatively unstable substrate in V-shaped valleys, but once established, they survive a long time with high shade tolerance. The dominance and coexistence of the two species may primarily depend on the intensity and frequency of geomorphological processes.
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