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    Incident radiation and the allocation of nitrogen within Arctic plant canopies : implications for predicting gross primary productivity

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    Street_LAI-N_WHOAS.pdf (686.3Kb)
    Date
    2012-01
    Author
    Street, Lorna E.  Concept link
    Shaver, Gaius R.  Concept link
    Rastetter, Edward B.  Concept link
    van Wijk, Mark T.  Concept link
    Kaye, Brooke A.  Concept link
    Williams, Mathew  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5583
    As published
    https://doi.org/10.1111/j.1365-2486.2012.02754.x
    Keyword
     Carbon balance; Climate change; Gross primary production; Diffuse radiation; Tundra vegetation; CO2 flux; Specific leaf area; Light extinction; Nitrogen extinction 
    Abstract
    Arctic vegetation is characterized by high spatial variability in plant functional type (PFT) composition and gross primary productivity (P). Despite this variability, the two main drivers of P in sub-Arctic tundra are leaf area index (LT) and total foliar nitrogen (NT). LT and NT have been shown to be tightly coupled across PFTs in sub-Arctic tundra vegetation, which simplifies up-scaling by allowing quantification of the main drivers of P from remotely sensed LT. Our objective was to test the LT–NT relationship across multiple Arctic latitudes and to assess LT as a predictor of P for the pan-Arctic. Including PFT-specific parameters in models of LT–NT coupling provided only incremental improvements in model fit, but significant improvements were gained from including site-specific parameters. The degree of curvature in the LT–NT relationship, controlled by a fitted canopy nitrogen extinction co-efficient, was negatively related to average levels of diffuse radiation at a site. This is consistent with theoretical predictions of more uniform vertical canopy N distributions under diffuse light conditions. Higher latitude sites had higher average leaf N content by mass (NM), and we show for the first time that LT–NT coupling is achieved across latitudes via canopy-scale trade-offs between NM and leaf mass per unit leaf area (LM). Site-specific parameters provided small but significant improvements in models of P based on LT and moss cover. Our results suggest that differences in LT–NT coupling between sites could be used to improve pan-Arctic models of P and we provide unique evidence that prevailing radiation conditions can significantly affect N allocation over regional scales.
    Description
    Author Posting. © The Author(s), 2012. This is the author's version of the work. It is posted here by permission of John Wiley & Sons for personal use, not for redistribution. The definitive version was published in Global Change Biology 18 (2012): 2838–2852, doi:10.1111/j.1365-2486.2012.02754.x.
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    • Ecosystems Center
    Suggested Citation
    Preprint: Street, Lorna E., Shaver, Gaius R., Rastetter, Edward B., van Wijk, Mark T., Kaye, Brooke A., Williams, Mathew, "Incident radiation and the allocation of nitrogen within Arctic plant canopies : implications for predicting gross primary productivity", 2012-01, https://doi.org/10.1111/j.1365-2486.2012.02754.x, https://hdl.handle.net/1912/5583
     

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