Light availability and soil flooding regulate photosynthesis of an imperiled shrub in lowland forests of the Mississippi Alluvial Valley,USA |
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Authors: | B R Lockhart E S Gardiner T D Leininger M S Devall A D Wilson K F Connor P B Hamel N M Schiff |
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Institution: | 1.USDA Forest Service, Southern Research Station,Center for Bottomland Hardwoods Research,Stoneville,USA |
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Abstract: | Physiological responses to light availability and soil flooding on Lindera melissifolia (Walt.) Blume were studied. Shrubs were grown under 70, 37 or 5% of full sunlight with either 0, 45, or 90 d of soil flooding. We measured leaf photosynthetic rate (PN) to test the hypothesis that soil flooding reduces P N in L. melissifolia following shrub acclimation to low light availability. Results showed that light availability and soil flooding interacted to affect P N. In the 0 d and 45 d flooding regimes (flood water removed 36–39 d prior to measurement), P N was similar between shrubs receiving 70% or 37% light, and these shrubs had 147% greater P N than shrubs receiving 5% light. Shrubs receiving 90 d of soil flooding had similar low rates of area-based P N regardless of light level. Similar P N between 0 d and 45 d flooded shrubs indicated physiological recovery following removal of flood water. |
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