Abstract
The light-penetration pattern for a mangrove Kandelia obovata canopy was analyzed considering the vertical changes in the light-extinction coefficients for leaves and woody organs. Furthermore, canopy photosynthesis and foliage respiration were estimated on the basis of the constructed light-penetration models. The canopy structure and light-penetration pattern were investigated by use of a destructive method. Seasonal changes in photosynthetic light-response curves and dark respiration of leaves were measured at different canopy depths. The main findings of this study were: (1) the ratio of the cumulative woody silhouette area density C to the cumulative leaf area density F increased downward within the canopy; (2) the light-extinction coefficient for leaves increased from 0.30 to 0.72 downward and the light-extinction coefficient for woody organs was almost constant at 0.77; and (3) ignoring the woody organs and the vertical change in the C/F ratio and light-extinction coefficients for leaves caused ca. ±10 and ±20% errors in annual canopy gross photosynthesis and surplus production, respectively.
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Acknowledgments
This paper is dedicated to Dr Akio Hagihara. I am grateful to my colleague Dr M.N.I. Khan for his helpful suggestions. This study was partially supported by the twenty-first Century COE program of the University of the Ryukyus.
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Suwa, R. Canopy photosynthesis in a mangrove considering vertical changes in light-extinction coefficients for leaves and woody organs. J For Res 16, 26–34 (2011). https://doi.org/10.1007/s10310-010-0203-z
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DOI: https://doi.org/10.1007/s10310-010-0203-z