広島県南西部における明治時代以降の植生景観の変遷と立地条件との関係

概要

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This study aimed to clarify the transition of the vegetation landscape of the Meiji era to the current vegetation, and the relation to between the vegetation landscape and environmental conditions in the southwest region of Hiroshima Prefecture. The vegetation landscape maps were made using the topographical map of the Meiji era. The vegetation landscape maps, geological maps, and altitude were analyzed using GIS. In both the ages, the main vegetation was the coniferous forest, which was distributed on granite, while the broad-leaved and coppice forests enclosing Quercus serrata and Q. acutissima were distributed on sedimentary rock. About 60.6% of the broad-leaved forest on sedimentary rock in the Meiji era has changed to afforested vegetation, and coppice forest has transformed to a Quercus forest. Coppice forest was distributed on a low-altitude area close to human inhabitation, and it was managed as a firewood-charcoal forest. After it was abandoned, the forest has grown as a Quercus forest. During the Meiji era, wasteland and bush were distributed on land at altitude of 500 m to 800 m; the bush on the sedimentary rock was an exclusion. Almost the entire vegetation grew on rhyolite, about 60.0% of has changed to afforested vegetation. The dwarf pine forest of the Meiji era was distributed on coarse-grained granite, and 88.0% of this forest has now changed to pine forest.