Distribution of bryophyte, pteridophyte, and flowering plant species in relation to the micro-landform in the Cryptomeria japonica and Chamaecyparis obtusa plantations of Mt. Tsukuba, central Japan

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  • SUGIMURA Koji
    Graduate School of Science and Technology, Chiba University
  • OKITSU Susumu
    Laboratory of Forest Ecology, Faculty of Horticulture, Chiba University

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Other Title
  • 筑波山のスギ・ヒノキ人工林におけるコケ植物,シダ植物,顕花植物の分布と微地形との関係
  • ツクバサン ノ スギ ヒノキ ジンコウリン ニ オケル コケ ショクブツ シダ ショクブツ ケンカ ショクブツ ノ ブンプ ト ビチケイ ト ノ カンケイ

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Abstract

In order to clarify the distribution of the bryophyte species in relation to micro-landforms, a vegetation survey was carried out in the conifer plantations of Cryptomeria japonica and Chamaecyparis obtusa in Mt. Tsukuba, Ibaraki Prefecture. The distribution of bryophyte species was compared with those of flowering plant species and pteridophyte species. We discussed the ecological significance of micro-landforms on the distribution and species diversity of bryophyte species in Cryptomeria japonica and Chamaecyparis obtusa plantations. The number of species which showed significant distribution bias for a specific micro-landform was highest in bryophytes, followed by pteridophytes and flowering plants. In particular, a large number of bryophyte species were found only on the bottomland. Average numbers of bryophytes species, pteridophytes and flowering plants in each of the microlandforms increased in the order of crest flat, crest slope, upper sideslope, lower sideslope, footslope and bottomland. The distribution trend of bryophytes along micro-landforms was similar to that of the pteridophytes rather than flowering plants. It was suggested that the distribution of plants in Cryptomeria japonica and Chamaecyparis obtusa plantations was influenced by the changing environ-mental conditions as the distance from the channel increased. We conclude that the bottomland provides a key habitat for the Cryptomeria japonica and Chamaecyparis obtusa plantations with species diversity, indicating the importance of bryophytes which were found only on the bottomland.

Journal

  • Vegetation Science

    Vegetation Science 26 (1), 33-48, 2009

    The Society of Vegetation Science

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