Cloud cover limits net CO2 uptake and growth of a rainforest tree during tropical rainy seasons

Recent global-scale analyses indicate that climate variability affects net carbon storage but regard temperature and precipitation to be the main contributors. Seasonal and interannual variation in light availability may also limit CO 2 uptake. As an experimental test of light limitation by cloud co...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2003-01, Vol.100 (2), p.572-576
Main Authors: Graham, Eric A, Mulkey, Stephen S, Kitajima, Kaoru, Phillips, Nathan G, Wright, S Joseph
Format: Article
Language:English
Subjects:
Biological Sciences
Carbon dioxide
Carbon Dioxide - metabolism
Climate
Clouds
Ecology
Light
Photosynthesis
Rain
Rainforests
Trees
Trees - growth & development
Trees - metabolism
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Summary:Recent global-scale analyses indicate that climate variability affects net carbon storage but regard temperature and precipitation to be the main contributors. Seasonal and interannual variation in light availability may also limit CO 2 uptake. As an experimental test of light limitation by cloud cover during tropical rainy seasons and by the unusually heavy cloud cover associated with La Niña, we installed high-intensity lamps above the forest canopy to augment light for Luehea seemannii , a tropical canopy tree species, during cloudy periods of 1999–2000. Light augmentation only partially compensated for the reduction in photosynthetic photon flux density caused by clouds. Nonetheless, leaves acclimated to the augmented irradiance, and photosynthesis, vegetative growth, and reproduction increased significantly. Light, rather than water, temperature, or leaf nitrogen, was the primary factor limiting CO 2 uptake during the rainy season. El Niño‖canopy‖photosynthesis‖light limitation
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.0133045100