The effect of different concentrations of SO2 on the foliar uptake of SO2 by four woody plants.*
| OS2 Concn (PPm) | SO2 uptake (mg/hr/g) | |||
|---|---|---|---|---|
| Birch | Ash | Firethorn | Azalea | |
| 1.0 | 0.268a | 0.115a | 0.222a | 0.071a |
| 0.5 | 0.260a | 0.109a | 0.218a | 0.069a |
| 0.2 | 0.214b | 0.112a | 0.178b | 0.077a |
↵*Mean separation in columns by Duncan’s multiple range test, 5% level. (From: Roberts, B.R. 1974. Foliar sorption of atmospheric sulfur dioxide by woody plants. Environ. Pollut. 7:133-140).