アポイ岳における高山植物群落の50(1954-2003)年間の変遷(<特集1>アポイ岳の植物群落-アポイ岳の高山植物群落の現状と将来について-)  [in Japanese] Decline of ultrabasicosaxicolous flora from 1954 to 2003 on Mt. Apoi, Hidaka Province, Hokkaido, Japan(Features I)  [in Japanese]

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Author(s)

    • 渡邊 定元 Watanabe Sadamoto
    • 立正大学地球環境科学部:(現)森林環境研究所 Laboratory of Forest Ecology, Faculty of Geo-Enviromental Sience, Rissho University:(Present address)Forest Enviromental Institute

Abstract

On Mt. Apoi, an ultrabasicosaxicolous flora with probably the greatest proportion of endemic species in the world has developed. Moreover, the flora has not been subject to succession to forest over the last 10,000 postglacial years. In the past 50 years, however, the flora of Mt. Apoi has experienced rapid deterioration and decline, mainly because of human activity-namely the illegal gathering of plant specimens-and succession to Pinus pentaphylla forest, with dramatic encroachment on beds of alpine flora. The former phenomenon has been conspicuous in Japan since 1970, when popular enthusiasm for mountain herbs began to grow. Organized illegal gathering as an occupation subsequently became pronounced, and Callianthemum miyabeanum, and other populations have declined sharply. The succession has predominantly involved invasion of ultrabasicosaxicolous flower beds on the southern slopes, primarily by Arundinella hirta, Calamagrostis sachalinensis, and Miscanthus sinensis. These have paced the continued existence of these flower beds in extreme jeopardy, and have acted as a precursor to the succession to Pinus forest. Nucifraga caryocatactes japonica bury Pinus seeds in these flower beds, facilitating sprouting. Pinus individuals reach heights of about 2.5 m within 15 years, during which time invasion by Lespedeza bicolor var. nana and Sasa apoiensis accelerates succession to forest. Global warming is certainly hastening the pace of this change. The disappearance of the flower beds is no doubt causing the loss of plants such as the endemic Hypochoeris crepidioides, which is found only on Mt. Apoi. It can be concluded that the ultrabasic area has already entered the final stages of forest succession.

Journal

  • JAPANESE JOURNAL OF ECOLOGY

    JAPANESE JOURNAL OF ECOLOGY 55(1), 105-110, 2005

    The Ecological Society of Japan

References:  13

Cited by:  2

Codes

  • NII Article ID (NAID)
    110001888762
  • NII NACSIS-CAT ID (NCID)
    AN00193852
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0021-5007
  • NDL Article ID
    7344154
  • NDL Source Classification
    ZR3(科学技術--生物学--植物)
  • NDL Call No.
    Z18-43
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE 
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