The Impact of Sulfur Dioxide on Vegetation: A Sulfur Dioxide-Ozone Response Model.

摘要

The objective of this project was to determine the effect of oxidant alone and in combination with 10 pphm sulfur dioxide upon red kidney bean, a commercial California crop. The experiment was conducted using exposure conditions that were characterized and validated as being similar to ambient conditions. Red kidney beans were grown in exposure chambers with 0%, 25%, 50%, 75% and 100% carbon filtered air alone and in combination with 10 pphm SO2. Additionally, 2ambient plots were utilized. An interaction with ozone and SO2was documented in the 50% carbon filtered treatment and produced a significant reduction in yield and plant biomass. The data also indicated the suggestion of an interaction in the 75% filtered treatment but at an unacceptable level of significance (p = .20level). No reductions in yield or plant biomass were detected on red kidney beans exposed to equivalent doses of ambient ozone alone. Ambient ozone alone produced significant reduction in yield (>or = 65%) but only at doses exceeding 5144 pphm-hrs. Sulfur dioxide at 10 pphm did not produce detectable plant or yield responses alone and did not have an interactive effect at ozone doses exceeding 5144 pphm-hrs.