Influence of grain-size distribution of sediment on vegetation, in wind-beaten bare ground, river bed and beach

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  • 砂礫地における堆積物の粒度組成が植生構造に及ぼす影響 : 高山風衝砂礫地・河床・海浜に共通する要因について
  • サレキチ ニ オケル タイセキブツ ノ リュウド ソセイ ガ ショクセイ コウゾウ ニ オヨボス エイキョウ : コウヤマカゼショウサレキチ ・ カショウ ・ カイヒン ニ キョウツウ スル ヨウイン ニ ツイテ

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We clarified that the grain-size distribution of the surface sediments influenced the vegetation cover and species composition in different sampling areas where sand and gravel were found. We studied wind-beaten bare ground, river beds, and beaches. We analyzed the relationships of vegetation cover, species composition, and life forms with the soil grain-size distribution of the surface sediments and the interstitial particles in gravel. On wind-beaten bare ground, the vegetation cover increased where the soil grain size was larger. On beaches, the vegetation cover tended to be high where the grain size was larger. On the upper floodplain, more herbaceous vegetation developed where the interstitial soil was finer. On the wind-beaten bare ground and beach, vegetation developed well on coarse gravel, since the larger gravel was relatively stable. The species composition on the wind-beaten bare ground and river channels differed significantly depending on the surface sediments. The life forms of plants differed, depending on the grain size of the mineral soil. The species composition also differed with the soil grain size.

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