title: Ecology of SO2resistance: I. Effects of fumigations on gas exchange of deciduous and evergreen shrubs.
abstract: A unique gas exchange system is described in which photosynthesis, transpiration, and stomatal conductance can be measured on leaves during SO2fumigations. SO2concentrations can be continuously monitored and manipulated between 0 and 2.0 ppm. Rates of total SO2uptake and SO2absorption through stomates of a fumigated leaf can also be determined.Using this system we compared the effects of SO2on the gas exchange rates of two shrub species that co-occur in the Califormian chaparral. Diplacus aurantiacus, a deciduous shrub, was more sensitive to SO2fumigation than Heteromeles arbutifolia, an evergreen shrub. The differences in photosynthetic sensitivity could be attributed, in large part, to differential SO2absorption rates.
authors.affiliation: Department of Biological Sciences, Stanford University, 94305, Stanford, CA, USA.
authors.forename: William E
authors.initials: WE
authors.lastname: Winner
authors.affiliation: Department of Biological Sciences, Stanford University, 94305, Stanford, CA, USA.
authors.forename: Harold A
authors.initials: HA
authors.lastname: Mooney