NDLI: Microsite variation in light availability and photosynthesis in a cool-temperate deciduous broadleaf forest in central Japan

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Microsite variation in light availability and photosynthesis in a cool-temperate deciduous broadleaf forest in central Japan

Content Provider	Springer Nature Link
Author	Sakai, Toru Saigusa, buko Yamamoto, Susumu Akiyama, Tsuyoshi
Copyright Year	2005
Abstract	An empirical light simulation model was applied to estimate stand scale photosynthesis in a deciduous broadleaved forest in central Japan. Based on diurnal courses of photosynthetically active photon flux density (PPFD), we characterized the components of incoming light within the forest canopy, and found that the instantaneous relative PPFD (PPFD under the canopy relative to that above the canopy) under diffuse light condition was a reliable estimator of the intensity and duration of PPFD. We calculated the daily photosynthesis (A$_{day}$) for each PPFD class using photosynthesis–light response curves. Model simulated A$_{day}$ were corroborated with the estimates obtained from the nearby CO$_{2}$ flux tower. The result demonstrated the potential of the light simulation model. The light use efficiency of two dominant species, Betula ermanii as overstory and Sasa senanensis as understory species, were then evaluated. At the forest understory, PPFD under 50 μmol m$^{−2}$ s$^{−1}$ contributed to 77% of the sunshine duration on a completely clear day. Therefore, a higher apparent quantum yield for S. senanensis enhanced the utilization of low PPFD for photosynthesis. On the other hand, at the upper forest canopies, B. ermanii with a higher light-saturated photosynthetic rate used high PPFD efficiently. Consequently, potential of daily net photosynthesis for both B. ermanii and S. senanensis was high under each light condition. Such interspecific difference in the patterns of light utilization was suggested as one of factors allowing coexistence of the two species in the study forest.
Starting Page	537
Ending Page	545
Page Count	9
File Format	PDF
ISSN	09123814
Journal	Ecological Research
Volume Number	20
Issue Number	5
e-ISSN	14401703
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-04-26
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Diffuse light Model Photosynthesis Sunfleck Temporal heterogeneity
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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