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- Title
The effect of plant water storage on water fluxes within the coupled soil-plant system.
- Authors
Huang, Cheng‐Wei; Domec, Jean‐Christophe; Ward, Eric J.; Duman, Tomer; Manoli, Gabriele; Parolari, Anthony J.; Katul, Gabriel G.
- Abstract
• 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 (∆Ψ p;night) along the plant vascular system overnight. This ∆Ψ p;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.
- Subjects
WATER damage; WATER activity of food; FOOD chemistry; WATER gods; HYDROLOGY; AQUATIC sciences
- Publication
New Phytologist, 2017, Vol 213, Issue 3, p1093
- ISSN
0028-646X
- Publication type
Article
- DOI
10.1111/nph.14273