5种园林植物对短期大气污染的光合生理反应

Eco-physiological Responses of Five Gardens Plant Species Exposed to Short-term Air Pollution

5种1～2年生园林植物分别盆栽于不同污染程度的交通繁忙区和相对洁净区，在第一个生长季结束后对各试验区植物叶片气体交换特征参数进行测定，评价了大气污染对不同植物种类的可能影响效果。根据综合污染指数，试验区污染强度表现为交通繁忙区〉相对清洁区。生长在污染区的大多数植物的净光合速率（Pn）、蒸腾速率（E）和气孔导度（gs）均出现不同程度的下降，下降幅度因植物种类不同而有较大差异。

Five 1 - 2 year - old garden plant species were transplanted into pots and exposed to differently polluted sites for 4 months during the growing season. Measurements on gas exchange parameters were made by using Li - cor 6400 photosynthesis system. Based on these measurements, the assessments of possible effects of air pollution on plants were also made. Monitoring data （ integrated pollution index） showed that the heavy traffic area was heavily polluted as compared with the relatively clear area. In the polluted area, the net photosynthetic rate, transpiration rate and stoma - opening degree of most plants were decreased to a certain extent, their decreased range of various plants was different.