Habitat characteristics and population structure of a rare tree, <i>Prunus pendul</i>a f. <i>ascendens</i>, in the upper reaches of the Inagawa River

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  • Ishida Hiroaki
    Institute of Natural and Environmental Sciences, University of Hyogo
  • Asami Kayo
    Institute of Rural & Urban Ecology Co., Ltd.
  • Kuroda Asumo
    Institute of Natural and Environmental Sciences, University of Hyogo
  • Aoki Hidemasa
    Japan Water Agency, Hitokura Dam Management Office
  • Hattori Tamotsu
    Institute of Natural and Environmental Sciences, University of Hyogo

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  • 猪名川上流域における希少樹種エドヒガンの生育立地と個体群構造
  • イナガワ ジョウリュウイキ ニ オケル キショウジュシュ エドヒガン ノ セイイク リッチ ト コタイグン コウゾウ

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We investigated the habitat characteristics and population structure of a rare tree (Prunus pendula f. ascendens) with conservation flagship status in the upper reaches of the Inagawa River. We identified 356 individuals in the study area (ca. 210ha in total). Almost all individuals were found in land tracts affected by human activities. The frequency distribution of tree height and diameter at breast height (DBH) were unimodal, and the proportion of individuals <1.0m high was only 4.2%. Few individuals of this species were shaded by the canopy of other trees. The species was distributed mainly on lower slopes, and no individuals were found on ridges. Thus, P. pendula f. ascendens is a disturbance-dependent species with strong habitat preference for sunny sites with mesic soil. Almost individuals were located in the Ultra-Tamba Belt, suggesting that geological conditions regulate the distribution of this species. We propose measures for conserving P. pendula f. ascendens.

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