Publication Date:
2022-05-25
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.
Description:
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:
This work was supported by a NOAA Climate and Global Change Postdoctoral
Fellowship to RBN, administered by the University Corporation for Atmospheric Research, by a
grant from the Andrew W. Mellon Foundation to NMH, and by DOE Terrestrial Ecosystem
Science grant ER65389 to ZGC and RBN.
Description:
2014-10-24
Keywords:
Hydraulic redistribution
;
Hydraulic lift
;
Helianthus annuus
;
Sunflower
;
Nighttime transpiration
;
Soil texture
Repository Name:
Woods Hole Open Access Server
Type:
Preprint
Format:
application/pdf
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