Effects of humidity on short-term responses of stomatal conductance to an increase in carbon dioxide concentration

aba agua amaranthus amaranthus retroflexus barley carbon dioxide carbon dioxide enrichment cebada dioxyde de carbone eau electrical conductivity enrichissement en gaz carbonique estoma feuille helianthus annuus hojas humedad relativa leaves malezas mauvaise herbe orge plant growth substances plant water relations relaciones planta agua relation plante eau relative humidity soja soybeans stomata stomatal resistance stomate sustancias de crecimiento vegetal trigo water weeds wheats