苹果树长期接触低浓度SO2对生长的影响

本文报道用四套开顶式熏气装置对四棵十一年生国光苹果树进行一个生长季低浓度SO_2熏气的试验结果,各罩内SO_2浓度分别为O(CK)、0.10、0.18和0.28 mg/m~3,结果表明,0.10 mg/m的SO_2对试验树的光合作用速率、叶面积、单位叶片重量和当年生枝条生长量无明显影响;0.18 mg/m有轻度影响;0.28mg/m影响显著。

Effects of Low Level of SO2 on Growth of Apple Tree Long-term Exposured to It

The experiments have ben conducted on the if-yearold Guoguang apple trees during a growing period b exposing to low levels of SO₂ in 4 top-open field cham-bers with one chamber for each tree. The tevels of SO₂in each chamber were 0, 0.10, 0.18 and 0.28 mg/m³, respectively. By the determination and analyses of the photosynthesis rate, area of leaf, unit weight of leaf and length of branches in one year old, it has been found that the exposure to 0.10 mg/m³ of SO₂ had to signiticant effect on the indicators studied, the exposure to 0.18 mg/m³ had a slight effect, and the exposure to 0.28 mg/m³ had a significant effect.