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• 基金项目：

• 曹洪法
• 中国环境科学研究院

• Taylor O.C.
• 美国加州大学空气污染研究中心

• 摘要：本研究采用连续搅拌槽反应器系统(CSTR)对菜豆(Phaseolus vulgaris)进行低浓度SO₂长期暴露试验.结果表明,SO₂在植物可见伤害阈值以下抑制了莱豆生长,叶片气孔阻力随SO₂浓度的增加而增加.植物一旦脱离SO₂污染的环境,气孔就恢复到正常水平.切除子叶的菜豆生长明显受抑,但对SO₂敏感性和留子叶菜豆相同.

• Abstract：Pinto bean plants (Phaseolus vulgaris) were exposed under 0.15,0.25, 0.50ppm of SO₂ until an identical dosage (0.50ppm-h/day) attained for one month to determine effect of atmospheric SO₂ on plant growth and stomatal response, and to compare sensitivity of intact pinto bean with that of acotyledonous pinto bean under SO₂ exposure.The results indicated that dosage of SO₂ below threshold of visible injury reduced growth of pinto bean, while identical dosage of SO₂ on pinto beans showed that concentration is more important than duration of exposure on effect to growth and development of pinto beans. The stomatal resistance of pinto bean plants increased with increasing concentration of SO₂ in the atmosphere. Reduction in plant growth was found proportional to reduction in stomatal conductance by exposing to SO₂. However, the effect of SO₂ on stomatal response disappeared and returned to normal one day after fumigation. Bean plants with cotyledons removed were smaller than intact plants, but response to SO₂ was similar in both groups.

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