車道による周辺植生への影響(I)
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概要
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It is the purpose of this paper to analyse the vegetational change caused by road construction in natural parks, where many park roads have been constructed innatural woodlands for recreational use. But the construction of it caused destruction of thenatural forest in many places. There have been many discussions about these problems, but the mechanism of destruction has not been jet clarified. And reports of this type of research have apparently not been published to date. The author tries to analyse these problems. After a road has been constructed in natural woodland, floristic composition of the roadside vegetation may be changed because of the change of the environment of the wood. Initially, from his observation of roadside vegetations, the author classifies them into four vegetational zones along the roads. He made some phytosociological investigations into these zones with the quadrate method along Odaigahara parkroad (Yoshino-Kumano National Park, Nara Prefecture) to examine his methodology. And he finds four zones, from the point of floristic composition, as he expected. Every community of the vegeta-tional zone has its characteristic species, which could be treated as an indicator of human impacts. The width of belt influenced is measured by line transect method, using these indicator species. The influence zone is 22.5-38.0m from the road. These indicator species are also used to measure the influence of construction of footpath in Odaigahara. It aimes to analyse the influences in accordance with the difference of the road width. The width of footpath is 2.0m and the influenced zone is 0.9-5.0m. Since the crown of the forest remains undestructed, the forest could have been protected from the sun and the wind. The author assumes that, influence had been increased, if the forest crown had been destructed. For the purpose of comparing successional stages, a stable stage of roadside vegetation is investigated in Aokigahara of Mt. Fuji (Fuji-Hakone-Izu National Park, Yamanashi Prefecture). Here the sleeve and mantle communities have grown in roadside, and the width of influenced zone is about 10m. The floristic compositions, the biological spectra and the stratification are analysed to clarify the character of the communities. In the next paper the author wishes to consider the influence of roads among various kinds of plant communities.
- 信州大学農学部の論文
- 1973-12-25
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