Gap characteristics and gap regeneration in primary evergreen broad-leaved forests of western Japan |
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Authors: | Shin-Ichi Yamamoto |
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Institution: | (1) Management of Forest Resources, Faculty of Agriculture, Okayama University, 700 Okayama, Japan |
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Abstract: | Gap characteristics and regeneration in gaps were studied in some primary evergreen broad-leaved forests of the warm temperate
zone in western Japan. Total observed 161 gaps covered 15.7% of the total land area of 8.23 ha. Gap density was 19. 6 gaps
ha−1 and mean gap size was 80.3 m2. Smaller gaps (<80 m2) were much more frequent than larger ones, and gaps larger than 400 m2 were rare. Gaps created by the death or the injury of single trees were 79.5%. Canopy trees died most often with broken trunks
and not so often by uprooting or leaving standing-dead. Different types of gap regeneration behaviour were recognized among
the major canopy tree species, though gap regeneration of the common evergreen broad-leaved tree species did not clearly depend
on a species-specific gap size.Distylium racemosum, which occurred in equal importance (about 25%) in the canopy layer of each study stand, regenerates in gaps from saplings
recruited before gap creation and can replace not only its own gaps but also gaps of other species. Therefore, it can be considered
a typical climax species in this forest type of western Japan.Persea thunbergii, which can reproduce vegetatively, showed a similar type of gap regeneration behaviour.Castanopsis cuspidata can replace itself with relatively higher frequency by means of vegetative reproduction (stump sprouting) after gap creation.Quercus acuta andQuercus salicina did not regenerate under the current gap-disturbance regime. Though the frequency of uprooting is low, soil disturbance by
uprooting seems to be important for the perpetuation of the pioneer tree species,Fagara ailanthoides, which recruits from buried seeds in the soil |
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Keywords: | Evergreen broad-leaved forests Gap regeneration Soil disturbance Typhoon Vegetative reproduction Warm temperate zone |
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