信州山間地におけるシダ植物の種密度分布と出現頻度：オシダ属の広がりと志賀高原からのスケーリング解析

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  • Distribution patterns of pteridophytes species density and frequency in Shinshu lowlands with respect to dryopteroid ferns with scaling from Shiga Heights, central Japan.
  • シンシュウ サンカンチ ニ オケル シダ ショクブツ ノ シュ ミツド ブンプ ト シュツゲン ヒンド オシダゾク ノ ヒロガリ ト シガ コウゲン カラ ノ スケーリング カイセキ

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説明

Pteridophytes flora was recorded at 1800 sites in the Shinshu lowlands (Nagano Prefecture) during 1996 to 2005. About 180 taxa, including variety and putative hybrids, were recorded and species density patterns were illustrated. The higher species density, more than 20 per ca. ha, was found around the northern and southern mountain regions in Shinshu. Fifteen hot spots with 26 < species were scattered in the regions, while cold spots with 5 > species were widely distributed in the central basins of Shinshu university. Thirty-three dryopteroid taxa were recorded with various spatial distributions and fre- quencies. Seven species were found at only one site, while 4 species were widely distributed in Shinshu within 272-680 sites. The 10 species were recorded only in the southern part of Shinshu. Six species were nominated to analyze the scaling frequency from the Shiga Heights in northeastern Shinshu to the Chubu-district and Japan Archipelago to determine the floristic characteristics of the Shiga field station at the Faculty of Education, Shinshu University. Three species were mainly distributed in the north, and the other 3 were in the central part of Japan, which represents the coexistence of temperate and cool-temperate floras in Japan.

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