从实验室熏气和野外大气暴露两方面研究了SO₂对蚕豆叶片内抗氧化剂水平的影响。熏气实验表明,低浓度的SO₂（0.1和0.05 ug/g）暴露能使超氧化物歧化酶（SOD）和过氧化物酶（POD）活性升高,而使抗坏血酸含量下降。野外大气暴露实验结果表明大气硫酸盐化速率与SOD活性呈极显著正线性相关（P<O.01）,与POD活性也存在一定的线性相关（P<0.05）,而与抗坏血酸含量呈极显著的负线性相关（P<0.01）。

The role of antioxidants, which are thought to scavenge the oxygen-free radicals in plants,was studied with the treatment of SO₂ under experimental and field condition. Increase in superoxide dismutase (SOD) and peroxidase (POD) activity, and decrease in ascorbic acid content were observed when fumigated with low concentration of SO₂(O. 1, 0. 05 pg/g).
Ambient air exposing experiments indicated that the rate of sulfatization in the air had a significant positive linear relation with SOD activity ( P < 0.01 ) and POD activity ( P <0. 05), and a negative linear relation with ascorbic acid content (P<0.01).