Does pre-dawn water potential reflect conditions of equilibrium in plant and soil water status?
Identifieur interne : 003053 ( Main/Exploration ); précédent : 003052; suivant : 003054Does pre-dawn water potential reflect conditions of equilibrium in plant and soil water status?
Auteurs : Arne Sellin [Estonie]Source :
- Acta Oecologica [ 1146-609X ] ; 1999.
Abstract
Variation in base water potential (Ψb, a daily maximum level of plant water potential, which is presumed to correspond to the equilibrium between soil and plant water potentials) was examined in shoots of Picea abies and Vaccinium myrtillus with respect to soil (available water storage, water potential, temperature) and atmospheric (temperature, relative humidity, vapour pressure deficit) conditions. The available soil water storage (Wtr) accounted for 77% of the dynamics of Ψb, while the influence of atmospheric factors became evident under high evaporative demand. Ψb was not always observable immediately before dawn, but on 30% of observation days, the recovery continued up to an hour or two after dawn. Full equilibrium between soil and plant water potentials in P. abies in northern conditions is rather improbable by dawn in summer-time, because of the shortness of the dark period and probable night-time transpiration in the case of high atmospheric vapour pressure deficit.
Url:
DOI: 10.1016/S1146-609X(99)80015-0
Affiliations:
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