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    Author(s): Annikki Makela; Harry T. Valentine
    Date: 2001
    Source: Tree Physiology. 21: 1015-1030.
    Publication Series: Scientific Journal (JRNL)
    Station: Northern Research Station
    PDF: Download Publication  (6.56 MB)


    Using Scots pine (Pinus sylvestris L.) in Fenno-Scandia as a case study, we investigate whether net primary production (NPP) and maintenance respiration are constant fractions of gross primary production (GPP) as even-aged mono-specific stands progress from initiation to old age. A model of the ratio of NPP to GPP is developed based on (1) the classical model of respiration, which divides total respiration into construction and maintenance components, and (2) a process-based model, which derives respiration from processes including construction, nitrate uptake and reduction, ion uptake, plhoem loading and maintenance.

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    Makela, Annikki; Valentine, Harry T. 2001. The ratio of NPP to GPP: evidence of change over the course of stand development. Tree Physiology. 21: 1015-1030.


    carbon balance, photosynthesis, pipe-model theory, modeling, respiration, Scots pine

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