Root hydraulic conductivity of Larrea tridentata and Helianthus annuus under elevated CO2

absorption d'eau carbon dioxide enrichment enrichissement en gaz carbonique estoma feuille gas exchange helianthus annuus hojas intercambio de gases leaves photosynthese photosynthesis plant water relations racine relaciones planta agua relation plante eau roots stomata stomatal resistance stomate transpiration water uptake zygophyllaceae