香川県直島の山火事跡再生二次林における野生ツツジ群落の保全

概要

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We performed trimming shrubs and sweeping up litters in a post-fire secondary forest to develop the skill for conserving the regenerated scrub forest using native Rhododendrons, not depending on forest fires. In results, we found several initial effects regarding preserving native Rhododendron communities and promoting the flower-buds differentiation. It is necessary to protect native Rhododendrons from being suppressed by other shrubs because most of species growing on this site had traits of vigorous sprouting. Especially, Eurya japonica that grows in higher density and Ligustrum lucidum, Robinia pseudo-acacia and Lespedeza cyrtobotrya that sprout longer branches need to be controlled.The effect of shrub trimming on seedling establishment was not clear at the next year after the shrub trimming. However, the effect of sweeping up litters will be expected by making adding efforts like keeping existing seedlings away from damages by sweeping, and sowing new seeds on suitable seedbeds after sweeping. The effect on flowering rates in the next spring after the shrub trimming was not observed because the timing of trimming was too late to stimulate the flower buds differentiation.
社団法人　日本造園学会の論文