DISTRIBUTION OF CHOSENLA ARBUTIFOLIA AND SOIL TEXTURE OF HABITATS ALONG THE SATSUNAI RIVER

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  • 札内川に沿ったケショウヤナギの分布と生育地の土性
  • サツナイガワ ニ ソッタ ケショウヤナギ ノ ブンプ ト セイイクチ ノ ドセ

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Abstract

The relationship between the distribution of seven salicaceous species and the soil texture of their habitats was studied in the floodplain of the Satsunai River, Hokkaido. Sandy and gravelly soils were common, but silty soil was very rare. Two groups of species were recognized : Salix species, Salix pet-susu, S. sachalinensis, S. rorida and S. gracllistyla, were dominant on the sandy soil, whereas a group composed of Chosenia arbutifolia, Toisusu urbaniana and Populus maximowiczii, predominated on the gravelly soil. C. arbutifolia was absent from the sandy soil, but was present in the alluvial fan zone, where the floodplain was wide and soil was very gravelly. P. maximowiczii and T. urbaniana were closely associated with the gravelly soil in the valley, where the floodplain was narrow. Indices of niche breadth and niche overlap showed S. sachalinensis and S. pet-susu to overlap widely, whereas C. arbutifolia had a narrow niche breadth and was segregated from the other salicaceous species. From these findings, a discussion is given of the relationship between geographical distribution and ecological traits of C. arbutifolia and the other salicaceous species in this study.

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