Effects of fluvial and geomorphic disturbances on forest dynamics of a sedimentation-dominated riparian forest in warm-temperate mountainous region in southern Japan

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  • 温暖帯の小扇状地に成立する渓畔林の動態に及ぼす地表変動攪乱の影響
  • 暖温帯の小扇状地に成立する渓畔林の動態に及ぼす地表変動攪乱の影響
  • ダンオンタイ ノ ショウセンジョウチ ニ セイリツスル ケイハンリン ノ ドウタイ ニ オヨボス チヒョウ ヘンドウ カクラン ノ エイキョウ

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Abstract

We investigated a 7-year dynamics of a sedimentation-dominated riparian forest in a warm-temperate region to examine the variations in disturbances regimes and its effect on diverse stand structure along the longitudinal stream gradient. The disturbance type varied from erosion-dominated to sedimentation-dominated with increasing size of disturbance from the upper to the lower stream. In the upper fan zone (UF-zone) and the middle fan zone (MF-zone) with high stability of soil surface, the survival rate of trees was higher than those in the other zones, indicating that established trees hardly disappear unless intensive disturbances associating with canopy destruction occur. This might be a factor in their high tree density with the wide range of tree size in the UF- and MF-zones. In lower fan zone (LF-zone) where the soil surface is unstable, we observed more recruitment of infrequent deciduous species and the characteristic species which had distributional bias in this zone. Thus, less intensive sedimentation in the stage of seedling establishment would be one of the important factors of the formation and maintenance of the differentiated species composition in the LF-zone.

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