Journal Article

Seasonal air and soil temperature effects on photosynthesis in red spruce (<i>Picea rubens</i>) saplings

Paul A. Schwarz, Timothy J. Fahey and Todd E. Dawson

in Tree Physiology

Volume 17, issue 3, pages 187-194
Published in print March 1997 | ISSN: 0829-318X
Published online March 1997 | e-ISSN: 1758-4469 | DOI:
Seasonal air and soil temperature effects on photosynthesis in red spruce (Picea rubens) saplings

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Net photosynthesis and stomatal conductance were measured in ten red spruce (Picea rubens Sarg.) saplings, growing near Ithaca, New York, throughout the early spring and late-fall growing periods. Gas exchange and daily minimum and maximum soil and air temperatures were also measured. Linear regression analysis showed that rates of net photosynthesis were positively correlated with both minimum daily soil and air temperatures but that minimum soil temperature was a better predictor of net photosynthesis. Moreover, net photosynthesis was more sensitive to changes in soil temperature than to changes in air temperature, and photosynthesis was approximately twice as sensitive to temperature changes during the fall than during the spring.

Keywords: air temperature; climatic change; gas exchange; seasonal effects; temperature sensitivity

Journal Article.  0 words. 

Subjects: Plant Sciences and Forestry

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