Effects of flooding depth on growth,morphology and photosynthesis in <Emphasis Type="Italic">Alnus japonica</Emphasis> species |
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Authors: | Fumiko Iwanaga Fukuju Yamamoto |
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Institution: | (1) Department of Forest Science, Faculty of Agriculture, Tottori University, Minami 4-101, Koyama Tottori, 680-8553, Japan |
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Abstract: | The present study deals with effects of flooding depth on growth, morphology and photosynthesis in Alnus japonica species thorough one field study and two controlled experiments. In the field study performed in Kushiro Mire, Hokkaido Island,
Japan, tree heights and stem diameters decreased with an increase in water depth accompanied with the reduction of soil redox
potential. In contrast, the rate of multiple stems per individual tree increased. In the controlled experiments for seedlings
flooding suppressed the shoot elongation and biomass increment in roots. However, diameter increment around water levels,
epicormic shoot development and adventitious root formation were enhanced in flooded seedlings. The photosynthetic rate and
stomatal conductance of flooded seedlings also were lowered with an increase in flooding depth. The recovery of the reduced
photosynthetic rate and stomatal conductance occurred simultaneously with the advancement of adventitious root formation in
the flooded seedlings. These results indicate the importance of a series of morphological changes occurring on stems around
water levels in flood tolerance in A. japonica species. |
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Keywords: | Adventitious roots Alnus japonica Flooding depth Photosynthesis |
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