Modelled hydraulic redistribution by sunflower (Helianthus annuus L.) matches observed data only after including night-time transpiration
Neumann, Rebecca B.
Cardon, Zoe G.
Rockwell, Fulton E.
Zwieniecki, Maciej A.
Holbrook, N. Michele
MetadataShow full item record
KeywordHydraulic redistribution; Hydraulic lift; Helianthus annuus; Sunflower; Nighttime transpiration; Soil texture
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.
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.
Showing items related by title, author, creator and subject.
Flow and hydraulics near the sill of Hood Canal, a strongly sheared, continuously stratified fjord Gregg, M. C.; Pratt, Lawrence J. (American Meteorological Society, 2010-05)Hood Canal, a long fjord in Washington State, has strong tides but limited deep-water renewal landward of a complex constriction. Tide-resolving hydrographic and velocity observations at the constriction, with a depth-cycling ...
Whitehead, John A. (Woods Hole Oceanographic Institution, 1998-07)Rotating Hydraulic Control was the topic of the thirty ninth year of the Geophysical Fluid Dynamics (GFD) program at the Woods Hole Oceanographic Institution. This theme was principally centered about those nonlinear ...
MacDonald, Daniel G. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2003-02)This thesis utilizes field data from the Fraser River Estuary, a highly stratified system located in southwestern British Columbia, Canada, to investigate the nature of mixing processes in a highly stratified environment, ...