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Article
Relationships Between Needle Nitrogen Concentration and Photosynthetic Responses of Douglas-Fir Seedlings to Elevated CO2 and Temperature
New Phytologist
  • James D. Lewis, Fordham University
  • Melissa S. Lucash, Portland State University
  • David M. Olszyk, US Environmental Protection Agency Western Ecology Division
  • David T. Tingey, US Environmental Protection Agency Western Ecology Division
Document Type
Article
Publication Date
1-1-2004
Subjects
  • Atmospheric carbon dioxide -- Physiological effect,
  • Douglas fir -- Growth,
  • Photosynthesis,
  • Acclimatization (Plants)
Abstract
Here we examined correlations between needle nitrogen concentration ([N]) and photosynthetic responses of Douglas-fir (Pseudotsuga menziesii) seedlings to growth in elevated temperatures and atmospheric carbon dioxide concentrations ([CO2]). Seedlings were grown in sunlit, climate-controlled chambers at ambient or ambient+3.5° C and ambient or ambient +180 μmol mol-1 CO2 in a full factorial design. Photosynthetic parameters and needle [N] were measured six times over a 21-month period. Needle [N] varied seasonally, and accounted for 30–50% of the variation in photosynthetic parameters. Across measurement periods, elevated temperature increased needle [N] by 26% and light-saturated net photosynthetic rates by 17%. Elevated [CO2] decreased needle [N] by 12%, and reduced net photosynthetic rates measured at a common [CO2], maximum carboxylation activity (Vc,max) and electrontransport capacity (Jmax), indicating photosynthetic acclimatization. Even so, elevated [CO2] enhanced net photosynthesis, and this effect increased with needle [N]. These results suggest that needle [N] may regulate photosynthetic responses of Douglas-fir to climate change. Further, needle [N] may be altered by climate change. However, effects of elevated [CO2] on photosynthesis may be similar across growth temperatures.
Description

To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by Wiley Blackwell and can be found at: URL http://dx.doi.org/10.1111/j.1469-8137.2004.01036.x

DOI
10.1111/j.1469-8137.2004.01036.x
Persistent Identifier
http://archives.pdx.edu/ds/psu/12624
Citation Information
Lewis, J. D., Lucash, M. M., Olszyk, D. M., & Tingey, D. T. (2004). Relationships between needle nitrogen concentration and photosynthetic responses of Douglas-fir seedlings to elevated CO2 and temperature. New Phytologist, 162(2), 355-364.