The effect of plant water storage on water fluxes within the coupled soil-plant system

Autor: C. W. Huang, Gabriele Manoli, Jean-Christophe Domec, Tomer Duman, Gabriel G. Katul, Eric J. Ward, Anthony J. Parolari
Přispěvatelé: Nicholas School of the Environment, Duke University [Durham], Interactions Sol Plante Atmosphère (UMR ISPA), Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Supérieure des Sciences Agronomiques de Bordeaux-Aquitaine (Bordeaux Sciences Agro), Environmental Sciences Division [Oak Ridge], Oak Ridge National Laboratory [Oak Ridge] (ORNL), UT-Battelle, LLC-UT-Battelle, LLC, Department of Biological Sciences, The Open University [Milton Keynes] (OU), Department of Civil, Construction, and Environmental Engineering, Marquette University [Milwaukee], Department of Civil and Environmental Engineering, Universidad de los Andes [Bogota] (UNIANDES), Interactions Sol Plante Atmosphère (ISPA), Marquette University, Universidad de los Andes [Bogota]
Jazyk: angličtina
Rok vydání: 2017
Předmět:
0106 biological sciences
nocturnal transpiration
hydraulic redistribution
leaf-level gas exchange
010504 meteorology & atmospheric sciences
Physiology
Hydraulics
[SDV]Life Sciences [q-bio]
Soil science
Plant Science
Models
Biological
Plant Roots
01 natural sciences
Sink (geography)
root water uptake
law.invention
relation sol-plante-atmosphère
Soil
water stress
plant water storage
Xylem
law
Potential gradient
Hydraulic redistribution
Plant system
0105 earth and related environmental sciences
Transpiration
drought resilience
geography
geography.geographical_feature_category
Ecology
Water storage
Water stress
fungi
sensibilité à la sécheresse
Water
food and beverages
Plant Transpiration
15. Life on land
système vasculaire des plantes
Carbon
6. Clean water
Plant Stomata
soil-plant-atmosphere relationship
Environmental science
stress hydrique
010606 plant biology & botany
Zdroj: New Phytologist
New Phytologist, Wiley, 2017, 213 (3), pp.1093-1106. ⟨10.1111/nph.14273⟩
ISSN: 0028-646X
1469-8137
DOI: 10.1111/nph.14273⟩
Popis: 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 (Fe,night) on hydraulic redistribution (HR) in the soil. The model results suggest that daytime PWS usage and Fe,night generate a residual water potential gradient (Δψp,night) along the plant vascular system overnight. This Δψp,night 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.
Databáze: OpenAIRE
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