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Tree-level recovery from hydraulic stress: Insights from experiments and hydrodynamic models

Bohrer, G.; Ruehr, N.; Fatichi, S.; Matheny, A. M.; Rehschuh R.; Mirfenderesgi G.

Abstract:
Modeling of plant hydraulics is at the forefront of development in vegetation and land-surface models. Numerical tools that consider water flow within the conductive system of plants, and particularly trees, have been developed and used in studies of hydraulic strategy and consequences of hydraulic behavior for drought tolerance. Several established land-surface models such as ED2, CLM, and E3SM have recently developed “hydro” versions and are ready to extrapolate the consequences of including tree hydraulic behaviors into large scale and global simulations. At the core of any plant hydrodynamic model is the assumption that xylem conductance is dependent on xylem water potential. This is typically represented using a Percent Loss of Conductivity (PLC) equation. Mathematically, these functions are reversible and do not include explicit hysteresis, i.e. as soon as water potential increases pre-stress levels of conductivity are regained. However, biological evidence suggests that post-stress recovery mechanisms are much slower, and the recovery of hydraulic conductance does not directly follow water potential.
We propose a range of po ... mehr



Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Poster
Jahr 2018
Sprache Englisch
Identifikator KITopen-ID: 1000089526
HGF-Programm 12.02.02 (POF III, LK 01)
Veranstaltung Fall Meeting (AGU 100 2018), Washington, DC, USA, 10.12.2018 – 14.12.2018
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