富士山高山域の異なる土壌粒径上に生育するオンタデ個体群のサイズ分布

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  • フジサン コウザンイキ ノ コトナル ドジョウ リュウケイ ジョウ ニ セイイク スル オンタデ コタイグン ノ サイズ ブンプ

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Abstract

Size distributions of Polygonum weyrichii var. alpinum, a dominant species in a volcanic gravel desert on Mt. Fuji, Japan, were compared be-tween two habitats with different soil particle sizes. The study sites were divided into two types, i.e., the large-scoria site（L-site）and the small-scoria site（S-site）based on the soil parti-cle size. 10 quadrats were set up at each of the two sites and number of individuals, diameter, and number of inflorescences of P . weyrichii var. alpinum within the quadrats were recorded. The number of small individuals（less than 10 cm in diameter）growing on the S-site was higher than that on the L-site. The total number of inflores-cences showed no significant difference between the two sites. At the L-site the large scoria layer with little water supply seems to limit the seed-ling establishment. At the S-site the surface movement of fine scoria might injure the plants. Thus, the soil structure appears to strongly in-fluence the size distribution of P . weyrichii var. alpinum.

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