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SULFUR DIOXIDE FLUX INTO LEAVES OF 'GERANIUM CAROLINIANUM' L.: EVIDENCE FOR A NONSTOMATAL OR RESIDUAL RESISTANCE
Citation:
Taylor, Jr., G. AND D. Tingey. SULFUR DIOXIDE FLUX INTO LEAVES OF 'GERANIUM CAROLINIANUM' L.: EVIDENCE FOR A NONSTOMATAL OR RESIDUAL RESISTANCE. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-83/036 (NTIS PB83255331), 1983.
Description:
The concurrent exchange of SO2 and H2O vapor between the atmosphere and foliage of Geranium carolinanum was investigated using a whole-plant gas exchange chamber. Total leaf flux of SO2 was partitioned into leaf surface and internal fractions. The emission rate of SO2-induced H2S was measured to develop a net leaf budget for atmospherically derived sulfur. Stomatal resistance to SO2 flux was estimated by two techniques. An accounting of the simultaneous, bidirectional flux of gaseous sulfur compounds during pollutant exposure showed that sulfur accumulation in the interior of G. carolinianum was 7 to 15% lower than that estimated solely from mass-balance calculation of SO2 flux data. On a comparative basis, SO2 molecules experienced less pathway resistance to diffusion than effluxing H2O molecules. Thus, the diffusive paths for H2O and SO2 in G. carolinianum are not completely synonymous.