Effect of Elevation above the Waterline on the Growth of Current-year Salix gracilistyla Seedlings on a Gravel Bar.

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  • Nakai A.
    Graduate School of Bioresources, Mie University
  • Kisanuki H.
    Graduate School of Bioresources, Mie University

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  • 水際からの比高が砂礫堆のネコヤナギ当年生実生の成長に及ぼす影響
  • ミズギワ カラノ ヒコウ ガ サレキタイ ノ ネコヤナギ トウネンセイ ミショウ ノ セイチョウ ニ オヨボス エイキョウ

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Abstract

To clarify the effect of the gradient in inundation duration and substrate particle size composition with elevation on the growth of Salix gracilistyla seedlings, we compared tree height, root depth, dry weight, and shoot/root biomass allocation of current-year seedlings at several elevations above the waterline on a gravel bar along the Miya River, Japan. Low dry weight at low elevations, where the inundation duration exceeded half of the growing season, suggests that the long inundation duration reduced seedling growth. Flooding disturbance also suppressed seedling growth at low elevations. Seedlings had high tree height, deep root depth, and low TR (shoot/root biomass) ratio at high elevations that were inundated for several days only during the growing season. The water retention of substrate at high elevations was higher than that at low elevations because of a higher proportion of small-diameter substrate. Seedlings at high elevations could endure drought because of the higher proportion of belowground tissue and deeper root depth than seedlings at low elevations. The inundation duration, substrate type, and disturbance intensity differed among elevations above the waterline, affecting the growth of S. gracilistyla seedlings.

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