Effect of micro-landforms on forest vegetation differentiation and life-form diversity in the Chichibu Mountains, Kanto District, Japan

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  • KAWANISHI Motohiro
    Graduate School of Environment and Information Science, Yokohama National University:(Present office)Teikyo University Senior High School
  • SAKIO Hitoshi
    Forest Laboratory, Saitama Prefecture Agriculture & Forestry Research Center
  • KUBO Masako
    Yamanashi Forest Research Institute
  • SHIMANO Koji
    Faculty of Science, Shinshu University
  • OHNO Keiichi
    Graduate School of Environment and Information Science, Yokohama National University

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Other Title
  • 奥秩父大山沢における森林植生の種組成分化と生活形・種多様性に及ぼす微地形の影響
  • Effect of micro-landforms on forest vegetation differentiation and life-form diversity in the Chichibu Moumains, Kanto district, Japan

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Abstract

We examined forest communities established on different micro-landforms at a river headwaters. Each forest belonged to a different order in the phytosociological system and was characterized by a specific spectrum of life forms. The relationship between the diversity of each life form and the differentiation of vegetation units is discussed, with special reference to micro-landforms. Cool-temperate forest vegetation in the Ooyamazawa River basin in central Japan was classified into three associations and four sub-associations: Cacalio yatabei-Pterocaryetum rhoifoliae (Acer shirasawanum sub-association and Deinanthe bifida sub-ass.), Sasamorpho-Fagetum crenatae (typical sub-ass. and Ainsliaea acerifolia var. subapoda sub-ass.), and Rhododendro pentameri-Chamaecyparidetum obtusae. Sasamorpho-Fagetum crenatae and Rhododendro pentameri-Chamaecyparidetum obtusae were characterized by diverse tree species and were found on the upper side slope and crest slope, respectively. Cacalio yatabei-Pterocaryetum rhoifoliae was characterized by diverse understory plants. The two lower units of Cacalio yatabei-Pterocaryetum rhoifoliae exhibited differentiated understory plant habitat that was related to the valley bottom and lower side slope. Because the diversity of each life form differs among micro-landforms, different vegetation units exist with specific species compositions and life-form spectra corresponding to micro-landforms.

Journal

  • Vegetation Science

    Vegetation Science 23 (1), 13-24, 2006

    The Society of Vegetation Science

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