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    Author(s): Renninger H.J.; Meinzer F.C.; B.L. Gartner
    Date: 2006
    Source: Tree Physiology. 27: 33-42
    Publication Series: Scientific Journal (JRNL)
    PDF: View PDF  (1.72 MB)

    Description

    We compared hydraulic architecture, photosynthesis, and growth in Douglas-fir with that of a shade-tolerant western hemlock. The study was conducted in a site that had been thinned to release suppressed trees, and one that remained unthinned. Release seemed to be constrained initially by photosynthetic capacity in both species. After released trees increased their photosynthetic capacity, hydraulic architecture appeared to constrain further release from suppression in Douglas-fir, and to a lesser extent, western hemlock. There were no significant differences between the above-ground leaf-specific conductivities of suppressed versus released trees of either species, but leaf-specific root conductance was significantly lower in released Douglas-fir.

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    Citation

    Renninger H.J.; Meinzer F.C.; Gartner, B.L. 2006. Hydraulic architecture and photosynthetic capacity as constraints on release from suppression in Douglas-fir and western hemlock. Tree Physiology. 27: 33-42

    Keywords

    Advance regeneration, carbon isotope ratios, leaf-specific conductivity, root conductance, nitrogen content

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