模拟酸雨对12种园林植物的伤害及敏感性反应

INHIBITORY EFFECTS OF SIMULATED ACID RAIN ON THE GROWTH OF 12 GARDEN PLANT SPECIES AND THEIR PHYSIOLOGICAL RESPONSE TO IT

测定了12种园林植物在不同pH值的模拟酸雨条件下新梢增长量、叶片损伤的程度和叶片叶绿素含量,以此分析了园林植物对酸雨污染的敏感性反应。结果表明,酸雨对园林植物具有明显的生长抑制作用和伤害,酸雨的pH值越低,抑制作用和伤害程度越大,叶片叶绿素含量下降幅度越大。不同种类对酸雨污染敏感性反应不一,用受害叶面积指数和叶片叶绿素含量为指标进行酸雨可见伤害阀值的计算和敏感性分级评价。在所试的12种园林植物中,以福建茶、垂榕对酸雨的抗性最强,红背桂、美蕊、大叶紫薇对酸雨的抗性最弱。

Twelve garden plant species were exposed to simulated acid rain with different pH values, and shoot growth, leaf injury and leaf chlorophyll content were determined. Under acid rain stress, shoot growth was inhibited in all the 12 species studied and, with the decline in pH of the acid rain, leaf injury index increased and chlorophyll content decreased. The species differed in their susceptibility to acid rain. Carmona microphylla and Ficus benjamina showed the highest resistance to acid rain while Excoecaria cochichinensis, Calliandra heametocephala and Lagerstroemia speciosa were most susceptible to it.