北海道におけるスキー場植生の現状と推移 : 地表改変・播種により造成維持されている場合

抄録

To obtain characteristics of ski ground vegetation and predict its successional sere, surveys were undertaken on three ski grounds in Hokkaido : Play Bankei (constructed in 1968), Teine Olympia (1971) and Makomanai (1980), whose land surface were modified by heavy human impact, i.e., land cutting, sowing of herbs, and regular bush cutting. Analysis of species composition and clustering revealed vegetation of sites surveyed to be mainly divisible into four vegetation groups as follows : al) grassland of sowed herbs ; a2) Artemisia montana grassland ; b) low-cover grassland ; c) Miscanthus sinensis grassland. Many native plants were unable to colonize and/or establish themselves in the artificial vegetation, but were able to establish themselves at sites where coverage of sowed herbs was reduced. Woody plants, such as Salix hultenii var. angustifolia, gradually established themselves at sites where sowed herbs had decreased and/or M. sinensis was well-established. Examination of the degree of succession supported these findings. The regeneration process of ski ground vegetation in lowland Hokkaido is discussed in relation to these results.