Modelled hydraulic redistribution by sunflower (Helianthus annuus L.) matches observed data only after including night-time transpiration
Date
2013-09Author
Neumann, Rebecca B.
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Cardon, Zoe G.
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Teshera-Levye, Jennifer
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Rockwell, Fulton E.
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Zwieniecki, Maciej A.
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Holbrook, N. Michele
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https://hdl.handle.net/1912/6724As published
https://doi.org/10.1111/pce.12206Keyword
Hydraulic redistribution; Hydraulic lift; Helianthus annuus; Sunflower; Nighttime transpiration; Soil textureAbstract
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.
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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/1912/6724Related items
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