An experiment was conducted to study the effects of simulated acid rain with different pH (3.0, 4.0, 5.0, 7.0) onthe leaf injury, soluble sugar content, catalase activity, net photosynthetic rate, malondialdehyde (MDA) content and freeproline content of the potted seedlings of Ficus elastica cv. Deco-ra. With the decrease of pH value, the percent of foliardamage gradually increased; soluble sugar content first decreased and then increased, and a maximum is attained at pH of3.0; catalase activity firstly increased and then decreased, and its maximum appeared at pH of 4.0; the proline contentand MDA content both gradually increased, and reached their maximum values at pH of 3.0; the net photosynthetic rateshowed an irregular decrease.%采用盆栽方法研究了4种不同pH值(3.0、4.0、5.0、7.0)的模拟酸雨对榕树幼苗叶片损伤、可溶性糖质量分数、净光合速率(Pn)、过氧化氢酶(CAT)活性、丙二醛(MDA)质量摩尔浓度、游离脯氨酸质量摩尔浓度的影响.结果表明:叶片受害率随着pH值的降低而增高;可溶性糖质量分数随着pH值的降低先减小后增高,在pH=3.0时迭最大值;CAT活性随着pH值的降低先增大后降低,在pH=4.0时达最大值;游离脯氨酸、MDA质量摩尔浓度随着pH值的降低均逐渐增高,且都在pH=3.0时达最大值;净光合速率随着pH值的降低与对照相比,呈现不规律下降.
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