Leaf gas exchange in a clonal eucalypt plantation as related to soil moisture, leaf water potential and microclimate variables

In order to determine how environmental and physiological factors affect leaf gas exchange in a 9-year-old clonal eucalypt plantation (Eucalyptus grandis Hill ex. Maiden hybrids) in the State of Espirito Santo, Brazil, the diurnal patterns of predawn leaf water potential (Psi(pd)) and leaf gas exchange were monitored Introduction from November; 1995 to August 1996. Soil water content (Theta) and microclimatic variables were also recorded. Most of the rainfall during the experimental period occurred from October to December 1995 and from March to April 1996, causing a significant variation in Theta and Psi(pd). A high positive correlation (r(2)=0.92) was observed between Psi(pd) and Theta measured at 0.3 m depth from the soil surface. During conditions of high soil water availability, the maximum values of stomatal conductance for water vapor (g(s)) and net photosynthetic rate (A) were over 0.4 mol m(-2) s(-2) and 15 mu mol m(-2) s(-2), respectively. The results showed that Psi(pd) and leaf gas exchange of the examined trees were susceptible to changes in the water content of the upper soil layers, where the major concentration of active roots occur. Multiple linear regression analysis indicated that photosynthetic active radiation (Q), vapor pressure deficit (VPD), atmospheric CO2 molar fraction (C-a), and Psi(pd) were the most important factors controlling g(s) whereas Q and VPD were the main microclimatic variables controlling A.