Effect of Elevated CO and Drought on Biomass, Gas Exchange and Wood Structure of .

Juvenile were exposed to drought and elevated CO to evaluate the independent and interactive effects on growth, gas exchange and wood structure. Trees were grown in a greenhouse at ambient and elevated CO (aCO, 410 ppm; eCO, 950 ppm), in combination with daily irrigation and cyclic drought during one growing season. The results demonstrated that drought stress limited intercellular CO concentration, photosynthesis, stomatal conductance, and transpiration, which correlated with a lower increment in height, stem diameter and biomass.