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    Author(s): A. C. Koehn; G. I. McDonaldD. L. Turner; D. L. Adams
    Date: 2010
    Source: Res. Pap. RMRS-RP-79. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 14 p.
    Publication Series: Research Paper (RP)
    Station: Rocky Mountain Research Station
    PDF: View PDF  (864.05 KB)

    Description

    As climate changes, understanding the mechanisms long-lived conifers use to adapt becomes more important. Light gradients within a forest stand vary constantly with the changes in climate, and the minimum light required for survival plays a major role in plant community dynamics. This study focuses on the dynamic plasticity of Douglas-fir (Pseudotsuga menziesii var. glauca [Beissn.] Franco) seedlings grown in contrasting light environments. Plasticity in Douglas-fir seedlings was primarily achieved by a combination of the physiological processes: maximum photosynthesis, quantum yield, Fv/Fm, Km (the light constant), light compensation point, and the ratio of needle area to needle weight (specific leaf area). Specific leaf area was the most plastic of the biomass parameters measured.

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    Citation

    Koehn, A. C.; McDonald, G. I.; Turner, D. L.; Adams, D. L. 2010. Dynamic phenotypic plasticity in photosynthesis and biomass patterns in Douglas-fir seedlings. Res. Pap. RMRS-RP-79. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 14 p.

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    Keywords

    Pseudotsuga menziesii var. glauca (Beissn.) Franco, dynamic phenotypic plasticity, photosynthesis, Douglas-fir, biomass allocation, light constant

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