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    Modelled hydraulic redistribution by sunflower (Helianthus annuus L.) matches observed data only after including night-time transpiration

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    HRExperimentManuscript_revised_with-figures.pdf (1.782Mb)
    Date
    2013-09
    Author
    Neumann, Rebecca B.  Concept link
    Cardon, Zoe G.  Concept link
    Teshera-Levye, Jennifer  Concept link
    Rockwell, Fulton E.  Concept link
    Zwieniecki, Maciej A.  Concept link
    Holbrook, N. Michele  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6724
    As published
    https://doi.org/10.1111/pce.12206
    Keyword
     Hydraulic redistribution; Hydraulic lift; Helianthus annuus; Sunflower; Nighttime transpiration; Soil texture 
    Abstract
    The movement of water from moist to dry soil layers through the root systems of plants, referred to as hydraulic redistribution (HR), occurs throughout the world and is thought to influence carbon and water budgets and ecosystem functioning. The realized hydrologic, biogeochemical, and ecological consequences of HR depend on the amount of redistributed water, while the ability to assess these impacts requires models that correctly capture HR magnitude and timing. Using several soil types and two eco-types of sunflower (Helianthus annuus L.) in split-pot experiments, we examined how well the widely used HR modeling formulation developed by Ryel et al. (2002) matched experimental determination of HR across a range of water potential driving gradients. H. annuus carries out extensive nighttime transpiration, and though over the last decade it has become more widely recognized that nighttime transpiration occurs in multiple species and many ecosystems, the original Ryel et al. (2002) formulation does not include the effect of nighttime transpiration on HR. We developed and added a representation of nighttime transpiration into the formulation, and only then was the model able to capture the dynamics and magnitude of HR we observed as soils dried and nighttime stomatal behavior changed, both influencing HR.
    Description
    Author Posting. © The Author(s), 2013. 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 Plant, Cell & Environment 37 (2014): 899-910, doi:10.1111/pce.12206.
    Collections
    • Ecosystems Center
    Suggested Citation
    Preprint: Neumann, Rebecca B., Cardon, Zoe G., Teshera-Levye, Jennifer, Rockwell, Fulton E., Zwieniecki, Maciej A., Holbrook, N. Michele, "Modelled hydraulic redistribution by sunflower (Helianthus annuus L.) matches observed data only after including night-time transpiration", 2013-09, https://doi.org/10.1111/pce.12206, https://hdl.handle.net/1912/6724
     

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