广州市酸雨演变规律及其生态学意义

The acid rain transformation and its ecological implication in Guangzhou city

根据近年来年广州市降水中酸雨频率、pH、硝酸根、硫酸根等的浓度,研究了广州市酸雨演变的生态学意义。结果得出,近年来广州市的酸雨频率有增加的趋势,特别是2001年以来,增加趋势更为明显;酸雨强度为弱酸型酸雨;酸雨类型仍以硫酸型酸雨为主,但随着SO2造成酸雨的贡献率降低,氮的氧化物的贡献率急剧增加,酸雨类型进一步接近于硝酸型;虽然目前降水尚未达到硝酸型的程度,但这种转变具有深远的生态学意义,特别是降水中氮的影响不容忽视。

Based on the frequency of acid rain, pH and the contents of NO3- and SO42- in the acid rain of Guangzhou city in recent years, the change of the acid rain type and its ecological implication were studied. The conclusion shows that in the past a few years, the frequency of the acid rain tended to increase, especially after 2001, the trend is becoming more apparently. The acid rain intensity was weak, and the type of acid rain was still belonged to sulphuric acid rain type. But as the contribution to acid rain of SO2 was reducing and the concentration of NOX was increasing rapidly, the type of the acid rain was approaching to nitric acid rain type. Although the type of acid rain is not nitric acid type now, yet this transformation has its profound ecological meaning, especially the influence of nitrogen in the rainfall.