Effect of inundation duration on <Emphasis Type="Italic">Salix gracilistyla</Emphasis> density and size on a gravel bar |
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Authors: | Arisa Nakai Hiromitsu Kisanuki |
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Institution: | (1) Graduate School of Bioresourses, Mie University, 1577 Kurimamachiya, Tsu 514-8507, Japan |
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Abstract: | To clarify the effects of inundation on the establishment of Salix gracilistyla trees, the relationship between total inundation duration and the distribution and size of trees was examined on a gravel
bar along the Miya River in central Japan. The density of S. gracilistyla was low at both low and high elevations on the gravel bar, but high at middle elevations. The density increased with up to
165 days of inundation and declined gradually with more than 165 days of inundation. Density had a negative effect on crown
area, whereas inundation duration had a positive effect. At lower elevations, growth limitation of S. gracilistyla is mainly caused by inundation stress, whereas at higher elevations it seems to be primarily due to drought stress, although
it depends on the total duration of inundation in a year (TDIY). Consequently, the density is highest at middle elevations
where trees do not become too large. These results suggest that inundation duration is one factor determining the density
of S. gracilistyla trees, which in turn affects the size of each tree. |
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Keywords: | Elevation above waterline Inundation duration Salix gracilistyla Tree density Tree size |
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