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We measured light-saturated photosynthesis ( A  net ), foliage respiration ( R  fol ) and stem respiration ( R  stem ) 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 m −  2  s −  1  for  A  net ,  R  fol  and  R  stem , respectively. Treatment differences for  A  net ,  R  fol  and  R  stem  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.

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