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. 1979 Jan;44(3):290-295.
doi: 10.1007/BF00545230.

Ecology of SO2 resistance: I. Effects of fumigations on gas exchange of deciduous and evergreen shrubs

William E Winner  1 , Harold A Mooney  1
Affiliations

Ecology of SO2 resistance: I. Effects of fumigations on gas exchange of deciduous and evergreen shrubs

William E Winner et al. Oecologia. 1979 Jan.

Abstract

A unique gas exchange system is described in which photosynthesis, transpiration, and stomatal conductance can be measured on leaves during SO2 fumigations. SO2 concentrations can be continuously monitored and manipulated between 0 and 2.0 ppm. Rates of total SO2 uptake and SO2 absorption through stomates of a fumigated leaf can also be determined.Using this system we compared the effects of SO2 on the gas exchange rates of two shrub species that co-occur in the Califormian chaparral. Diplacus aurantiacus, a deciduous shrub, was more sensitive to SO2 fumigation than Heteromeles arbutifolia, an evergreen shrub. The differences in photosynthetic sensitivity could be attributed, in large part, to differential SO2 absorption rates.

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