Journal Article

Ecosystem warming does not affect photosynthesis or aboveground autotrophic respiration for boreal black spruce

Dustin R. Bronson and Stith T. Gower

in Tree Physiology

Volume 30, issue 4, pages 441-449
Published in print April 2010 | ISSN: 0829-318X
Published online February 2010 | e-ISSN: 1758-4469 | DOI: http://dx.doi.org/10.1093/treephys/tpq001
Ecosystem warming does not affect photosynthesis or aboveground autotrophic respiration for boreal black spruce

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We measured light-saturated photosynthesis (Anet), foliage respiration (Rfol) and stem respiration (Rstem) of black spruce (Picea mariana (Mill.) B.S.P.) in heated (+5 °C) and control plots during 2005, 2006 and 2007 in Thompson, MB, Canada. Large greenhouses and soil-heating cables were used to maintain air and soil temperature 5 °C above ambient air and soil temperature. Each greenhouse contained approximately nine black spruce trees and the majority of their fine root mass. Treatments were soil and air warming, soil-only warming, greenhouses maintained at ambient air temperature and control. Gas exchange rates ranged 0.71–4.66, 0.04–0.74 and 0.1–1.0 µmol m2 s1 for Anet, Rfol and Rstem, respectively. Treatment differences for Anet, Rfol and Rstem were not significant in any of the 3 years of measurements. The results of this experiment suggest that in a warmer climate, black spruce may not have significant changes in the rate of photosynthesis or respiration.

Keywords: carbon cycling; climate change; foliage respiration; global warming; Picea mariana; stem respiration

Journal Article.  5562 words.  Illustrated.

Subjects: Plant Sciences and Forestry

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