We investigated the vegetation and flora of Naruyama area, Ino Town, a typical rural mountainous area in Kochi Prefecture. We listed 117 families and 567 species (including subspecies and variety) in the area of 2.2㎢. They consist of 73 spp. belonging to Pteridophyta, 6 spp. Gymnospermae, and 488 spp. Angiospermae which include 13 endangered species and 29 alien species. The alien species rate of this area was very low (5%) as compared with those of other areas. The differences in floristic composition and species diversity among community types were discussed based on 188 vegetation data collected from sample stands of seven forest types and many types of scrubs and herbaceous communities developing on roadside slopes and abandoned terraced paddy fields. The values of species diversity indices of slope stands maintained by frequent mowing around roads and paddy fields were very high, while those of abandoned terraced paddy fields were relatively low. The beta diversity between communities in Naruyama area was high, because various human disturbances such as cutting, mowing, clearing, plowing and burning, provided a variety of habitats for plants. In addition, serpentine areas Which have particular vegetation and flora, contributed to increase the plant species diversity of Naruyama area. However, the increase of abandonment of arable fields and vegetation succession following after that has reduced the plant species diversity of this area.
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