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Title: The effect of plant water storage on water fluxes within the coupled soil-plant system [The role of plant water storage on water fluxes within the coupled soil-plant system]

Journal Article · · New Phytologist
DOI:https://doi.org/10.1111/nph.14273· OSTI ID:1345006
 [1];  [2];  [3];  [4];  [1];  [5];  [1]
  1. Duke Univ., Durham, NC (United States)
  2. Duke Univ., Durham, NC (United States); Bordeaux Sciences Argo, Gradignan Cedex (France)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Rutgers Univ., Newark, NJ (United States)
  5. Marquette Univ., Milwaukee, WI (United States)

Summary In addition to buffering plants from water stress during severe droughts, plant water storage (PWS) alters many features of the spatio‐temporal dynamics of water movement in the soil–plant system. How PWS impacts water dynamics and drought resilience is explored using a multi‐layer porous media model. The model numerically resolves soil–plant hydrodynamics by coupling them to leaf‐level gas exchange and soil–root interfacial layers. Novel features of the model are the considerations of a coordinated relationship between stomatal aperture variation and whole‐system hydraulics and of the effects of PWS and nocturnal transpiration ( ) on hydraulic redistribution (HR) in the soil. The model results suggest that daytime PWS usage and generate a residual water potential gradient ( ) along the plant vascular system overnight. This represents a non‐negligible competing sink strength that diminishes the significance of HR. Considering the co‐occurrence of PWS usage and HR during a single extended dry‐down, a wide range of plant attributes and environmental/soil conditions selected to enhance or suppress plant drought resilience is discussed. When compared with HR, model calculations suggest that increased root water influx into plant conducting‐tissues overnight maintains a more favorable water status at the leaf, thereby delaying the onset of drought stress.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725; DE‐SC0006967; DE‐SC0011461; SC0006967; SC0011461
OSTI ID:
1345006
Alternate ID(s):
OSTI ID: 1400469
Journal Information:
New Phytologist, Vol. 213, Issue 3; ISSN 0028-646X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 73 works
Citation information provided by
Web of Science

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Plant Hydraulic Trait Covariation: A Global Meta-Analysis to Reduce Degrees of Freedom in Trait-Based Hydrologic Models journal July 2018
A network model links wood anatomy to xylem tissue hydraulic behaviour and vulnerability to cavitation: Model links wood anatomy to plant hydraulics journal September 2018
Greater focus on water pools may improve our ability to understand and anticipate drought‐induced mortality in plants journal January 2019
Phylogenetic and biogeographic controls of plant nighttime stomatal conductance journal March 2019
Xylem–phloem hydraulic coupling explains multiple osmoregulatory responses to salt stress journal June 2019
Modeling Canopy Carbon and Water Fluxes Using a Multilayered Model over a Temperate Meadow in Inner Mongolia journal October 2019
A dynamic yet vulnerable pipeline: Integration and coordination of hydraulic traits across whole plants journal July 2019
Prediction of hydraulic conductivity loss from relative water loss: new insights into water storage of tree stems and branches journal September 2018
Coupling of ecosystem-scale plant water storage and leaf phenology observed by satellite journal August 2018
Effects of Liming and Urochloa brizantha Management on Leaching Potential of Picloram journal January 2019
Tree Mortality Decreases Water Availability and Ecosystem Resilience to Drought in Piñon-Juniper Woodlands in the Southwestern U.S.: Tree Mortality in Semiarid Biomes journal December 2017
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A Critical Evaluation on the Role of Aerodynamic and Canopy–Surface Conductance Parameterization in SEB and SVAT Models for Simulating Evapotranspiration: A Case Study in the Upper Biebrza National Park Wetland in Poland journal November 2018
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