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Winter photosynthesis of red spruce from three Vermont seed sourcesAuthor(s): P.G. Schaberg; R.C. Wilkinson; J.B. Shane; J.R. Donnelly; P.F. Cali
Source: Tree Physiology. 15: 345-350.
Publication Series: Scientific Journal (JRNL)
Station: Northern Research Station
PDF: Download Publication (58.36 KB)
DescriptionWe evaluated winter (January through March) carbon assimilation of red spruce (Picea rubens Sarg.) from three Vermont seed sources grown in a common garden in northwestern Vermont. Although CO2 exchange rates were generally low, net photosynthetic rates increased during two prolonged thaws. Significant correlations between CO2 exchange rates and multiday air temperature means supported our observations of enhanced gas exchange during extended periods of elevated temperature. Increases in photosynthesis during thaws occurred before observed increases in leaf conductance, indicating that initial changes in photosynthesis were probably not associated with changes in stomatal aperture. Results of correlations between photosynthetic rates and PAR suggested that solar irradiance did not have a strong effect on winter carbon capture.
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CitationSchaberg, P.G.; Wilkinson, R.C.; Shane, J.B.; Donnelly, J.R.; Cali, P.F. 1995. Winter photosynthesis of red spruce from three Vermont seed sources. Tree Physiology. 15: 345-350.
Keywordscarbon assimilation, carbon exchange, genetic variation, leaf conductance, Picea rubens, stomatal aperture, temperature.
- Photosynthetic capacity of red spruce during winter
- Winter photosynthesis in red spruce (Picea rubens Sarg.): limitations, potential benefits, and risks
- Physiological changes in red spruce seedlings during a simulated winter thaw
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