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ROOT WATER POTENTIAL [2 records]

Record 1 2003-05-08

English

Subject field(s)
  • Soil Science
  • Meteorology
  • Hydrology and Hydrography
  • Plant Biology
CONT

Plants lose water to the atmosphere whenever stomata are open. Thus, plants have to give up water to obtain carbon for photosynthesis. This transfer of water to the atmosphere through plants is called transpiration.

CONT

Water transfer from soil through plants to the atmosphere.... The basic assumption is that the driving force for water transport, from the soil through the plant to the atmosphere, is the gradient in energy level of the water over this pathway. In the soil, this energy level is expressed by the water potential of the soil in the root zone.

Key term(s)
  • transfer of liquid water through plants
  • liquid water transfer through plants

French

Domaine(s)
  • Science du sol
  • Météorologie
  • Hydrologie et hydrographie
  • Biologie végétale
CONT

Transfert à travers les plantes. Il est provoqué par la transpiration qui entraîne une absorption au niveau des racines et un prélèvement sur les réserves de la plante; ce prélèvement est nul en début de journée, puis il devient positif en cours de journée; en fin de journée et surtout la nuit, il est négatif, c'est-à-dire qu'il y a reconstitution des réserves de la plante.

CONT

Dynamique de l'eau dans le sol. A. Diffusion de l'eau à l'état de vapeur [...] B. Transfert de l'eau liquide en sol saturé. [...] C. Transfert de l'eau liquide en sol non saturé [...] D. Généralisation au transfert sol-feuille [...]

Key term(s)
  • transfert d'eau à travers les plantes

Spanish

Save record 1

Record 2 2003-02-24

English

Subject field(s)
  • Plant Biology
  • Soil Science
  • Drainage and Irrigation (Agric.)
CONT

The driving force for root uptake is the water potential difference between soil and plant. Water is transported from high potential to low. There are two principally different resistances to water transfer from the soil to the exchangeable pool in the plant. In the soil, the resistance depends on soil characteristics and soil water potential, while in the plant, biological factors regulate the resistance. The first resistance is called the soil-root resistance(rr) and the second is called the plant resistance(rp) and they are coupled in series, i. e. a water molecule has to path both resistances.

CONT

Access to water can be more difficult because the soil close to the roots tend to dry more quickly. The resistance to water transfer towards the roots gets stronger. But water uptake is essentially limited by the heterogeneous distribution of the roots in the soil.

Key term(s)
  • water transfer resistance
  • liquid water transfer resistance

French

Domaine(s)
  • Biologie végétale
  • Science du sol
  • Drainage et irrigation (Agriculture)
CONT

[...] la résistance au transfert d'eau liquide dans le sol ou le continuum sol-plante est le quotient de la différence de potentiel hydrique total [delta psi]T entre deux niveaux par le flux liquide [phi] : R = [delta psi]T/[phi].

OBS

résistance : Paramètre qui figure dans les équations de transfert de gaz, de liquide ou de chaleur exprimant le flux en fonction d'une différence de concentration, de potentiel hydrique ou de température.

Spanish

Save record 2

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