石狩川に沿ったヤナギ科植物の分布と生育地の土壌の土性

概要

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Relationships between the distribution of co-occurring Salicaceous species and soil texture of their habitats were studied in the floodplain of the Ishikari River, Hokkaido. Four river morphological zones were distinguished. The delta zone was characterized by a homogeneous, fine soil texture which contained gley-spots, and in these extremely moist conditions Salix subfragllis was dominant. The river meandered greatly in the intermediate zone, and here S. sachalinensis was dominant. The largest number of Salicaceous species occurred in the alluvial fan zone, where soil texture was spatially heterogeneous. Populus maximowiczii was found only in the valley zone. An estimation of niche relationships among nine Salicaceous species and Alnus hirsuta revealed both broad niche species(S. sachalinensis and S. pet-susu)and narrow niche species(S. gracilistyla and P. maximowiczii)to be present. The largest niche overlap was found between S. sachalinen-sis and S. pet-susu, which are taxonomically closely related. The nine Salicaceous species and A. hirsuta were divided into three species groups by the group-averaged clustering method using a niche overlap index.
日本生態学会の論文
1987-12-31