Effects of simulated acid rain on the physiological characteristics in ginkgo.

Effects of simulated acid rain treatment on the physiological and biochemical characte-ristics of ginkgo were investigated under different pH value((pH2.0、3.0、4.0、5.6).The results showed that the effect of pH≤3.0 simulated acid rain on ginkgo was stronger than that of others;under the stress of simulated acid rain,the activities of catalase(CAT) and superoxide dismutase(SOD) increased sharply at the beginning and then kept steady-going at a high level,the content of malondialdehyde(MDA) increased at the beginning and then decreased,the rate of electrolyte leakage decreased slowly at the late stage of the stress from simulated acid rain.So pH=3.0 was the recessive critical damage point and ginkgo could respond promptly to the long-term acid rain stress,physiological characteristics about some acid-resistant could be obtained through long-term acid rain stress.