自然教育園内の路縁群落における人里植物の分布

概要

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The distribution of ruderal plants in this Park was reported by Odaki and Iwase (1966). We studied again about "how do they live along the wayside in this Park ?" from 1978 to 1980. The wayside is continuously under human impact, such trampling and mowing. On the wayside, fourty quadrats (1x1 sq.m)were set and the number of ruderal plants(density) was measured. Light conditions were recorded with five classes from sunny to shadowy at each quadrat. The community types were determined based on the floristic composition of the ruderal plants (Table 1). Thirty three species of ruderal plants were found in all quadrats. Among them, the dominant was Erigeron philadelphicus, and the sub-dominant was Plantago asiatica. The growth form of those species belongs to the rosette or partial rosette type. About fifty percent of species belong to the rosette type, and others were tussock, prostrate types and so on. The ruderal plants disappeared on the forest ground in developed seral stages, which were under shadowy conditions. The hubitat of ruderal plants is restricted to unfavourable enviromental conditions even along the wayside. Many ruderal plants were, however concentrated around the buildings in this Park, so the further increment of human impact will lead to spreading of the ruderal plants from such a center to other places.
国立科学博物館の論文
1980-12-25