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REDUCED STOMATAL CONDUCTANCE IN SWEETGUM (LIQUIDAMBAR STYRACIFLUA) SUSTAINED OVER LONG-TERM CO2 ENRICHMENT
Citation:
Herrick*, J D., H. Maherali, AND R. B. Thomas. REDUCED STOMATAL CONDUCTANCE IN SWEETGUM (LIQUIDAMBAR STYRACIFLUA) SUSTAINED OVER LONG-TERM CO2 ENRICHMENT. NEW PHYTOLOGIST. Blackwell Publishing, Malden, MA, 162(2):387-396, (2004).
Description:
Over four years (1998-2001), we examined the effects of CO2 enrichment on stomatal conductance (gs) of sun and shade leaves of overstory sweetgum (Liquidambar styraciflua L.) grown at the Duke Forest Free Air Carbon CO2 Enrichment (FACE) experiment. Gas exchange measurements were taken in June and September of each year. Stomatal density was measured in June of 2000. We found a 28% reduction of gs, in elevated CO2 that was sustained over the study period and was similar in the sun and shade leaves. During June 2001, gs of sun leaves measured at a common CO2 concentration was 16% lower in elevated CO2 than ambient CO2, suggesting that stomatal acclimation may have contributed to the reduction of gs at elevated CO2 for that time period. Stomatal density was not affected by CO2 enrichment. Decreased gs of sweetgum leaves in CO2 enrichment is consistent with patterns observed for canopy conductance of sweetgum, but different than loblolly pine needles, at the Duke Forest FACE experiment.
