Abstract
Light absorption and use efficiency (LAUE mol mol−1, daily gross photosynthesis per daily incident light) of each leaf depends on several factors, including the degree of light saturation. It is often discussed that upper canopy leaves exposed to direct sunlight are fully light-saturated. However, we found that upper leaves of three temperate species, a heliophytic perennial herb Helianthus tuberosus, a pioneer tree Alnus japonica, and a late-successional tree Fagus crenata, were not fully light-saturated even under full sunlight. Geometrical analysis of the photosynthetic light response curves revealed that all the curves of the leaves from different canopy positions, as well as from the different species, can be considered as different parts of a single non-rectangular hyperbola. The analysis consistently explained how those leaves were not fully light-saturated. Light use optimization models, called big leaf models, predicted that the degree of light saturation and LAUE are both independent of light environment. From these, we hypothesized that the upper leaves should not be fully light-saturated even under direct sunlight, but instead should share the light limitation with the shaded lower-canopy leaves, so as to utilize strong sunlight efficiently. Supporting this prediction, within a canopy of H. tuberosus, both the degree of light saturation and LAUE were independent of light environment within a canopy, resulting in proportionality between the daily photosynthesis and the daily incident light among the leaves.
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Acknowledgments
We are grateful to Seiichi Nishimura, who gave us technical instructions for light measurement by the photodiodes. Nobuhiro Tano provided IPU-1 weather data for us. We thank Megumi Nishita and Tsuyoshi Horie for their fieldwork assistances. Koichiro Sawakami gave us useful comments on non-saturation of other species. Comments from Robert Pearcy as well as from the two reviewers greatly improved this manuscript. We thank Yuji Isagi, Akira Osawa and Seiichi Ohta for valuable suggestions. This study received financial support from the Ministry of Education, Science, Sports and Culture of Japan (grant #20370014) and from the Kanazawa Unit of UNUIAS.
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Koyama, K., Kikuzawa, K. Geometrical similarity analysis of photosynthetic light response curves, light saturation and light use efficiency. Oecologia 164, 53–63 (2010). https://doi.org/10.1007/s00442-010-1638-9
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DOI: https://doi.org/10.1007/s00442-010-1638-9