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PDWP [1 record]

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Alphabetical list of terms

Record 1 2003-05-22

English

Subject field(s)
  • Plant Biology
CONT

Measurements of plant predawn water potential are often used as an index to indicate the water-stress level of a plant and for comparing plant water-availability in different habitats. Such use of plant predawn water potential is based on the assumption that, during the night, the water potential of a plant equilibrates with that of the soil.

Key term(s)
  • plant pre-dawn water potential
  • predawn water potential of a plant
  • pre-dawn water potential of a plant

French

Domaine(s)
  • Biologie végétale
CONT

[...] le potentiel [hydrique] foliaire dépend ainsi tout d'abord du potentiel de base, c'est-à-dire du potentiel des couches successives du sol explorées par les racines.

CONT

De nuit et un temps suffisant après cessation de toute transpiration végétale, le potentiel foliaire prend une valeur d'équilibre, appelée potentiel de base, qui correspond à une moyenne pondérée des potentiels matriciels de l'eau dans les couches de sol prospectées par les racines; cette pondération dépend du profil d'enracinement.

CONT

Combretum glutinosum, en saison sèche, maintient un potentiel de base élevé en exploitant les strates profondes du sol et diminue son déficit hydrique interne au cours de la journée par une régulation de l'ouverture stomatique et une défoliation partielle.

Spanish

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