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    Author(s): Annikki Makela; Harry T. Valentine; Helja-Sisko Helmisaari
    Date: 2008
    Source: New Phytologist. 180: 114-123.
    Publication Series: Scientific Journal (JRNL)
    Station: Northern Research Station
    PDF: View PDF  (279.38 KB)

    Description

    Nitrogen (N) is essential for plant production, but N uptake imposes carbon (C) costs through maintenance respiration and fine-root construction, suggesting that an optimal C:N balance can be found. Previous studies have elaborated this optimum under exponential growth; work on closed canopies has focused on foliage only. Here, the optimal co-allocation of C and N to foliage, fine roots and live wood is examined in a closed forest stand. Optimal co-allocation maximizes net primary productivity (NPP) as constrained by stand-level C and N balances and the pipe model. Photosynthesis and maintenance respiration increase with foliar nitrogen concentration ([N]), and stand-level photosynthesis and N uptake saturate at high foliage and fine-root density. Optimal NPP increases almost linearly from low to moderate N availability, saturating at high N. Where N availability is very low or very high, the system resembles a functional balance with a steady foliage [N]; in between, [N] increases with N availability. Carbon allocation to fine roots decreases, allocation to wood increases, and allocation to foliage remains stable with increasing N availability. The predicted relationships between biomass density and foliage [N] are in reasonable agreement with data from coniferous stands across Finland. All predictions agree with our qualitative understanding of N effects on growth.

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    Citation

    Makela, Annikki; Valentine, Harry T.; Helmisaari, Helja-Sisko. 2008. Optimal co-allocation of carbon and nitrogen in a forest stand at steady state. New Phytologist. 180: 114-123.

    Keywords

    allocation, carbon and nitrogen, forest, functional balance, growth model, optimization, productivity and biomass, steady state

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