我国低纬度、亚热带地区的降水化学及其雨水酸化趋势分析

Precipitation Chemistry and Trends of Rainwater Acidification at the Low Latitude and Subtropics of China

在世界上酸沉降研究尚为空白的低纬度、亚热带地区建立了酸沉降监测网。通过两年的监测，结果表明降水中酸度和离子总浓度季节变化明显，Ｃａ￣（２＋）和ＮＨ在降水离子构成中占百分率较高，阳离子总和略大于阴离子总和。两广地区降水酸度是雨水中多种阴、阳离子综合作用的结果，降水中ＳＯ浓度高的地区是ＳＯ＿２排放量高的地区，控制雨水逐年酸化趋势的唯一途径是限制ＳＯ＿２排放。

A monitoring network of acid deposition has been established at the low latittide and subtropics in China where acid deposition research was blank in the worid.A two years’monitoring has been conducted with this network.The data showed a clear seasonal variations of aciditv and total ion concentrations of rainwater.There is a higher, Ca￣(2+) and percentage in the ion composi-tion of rainwater. The cation sum was slightly higher than anion sum. The precipitation acidity in Guangdong and Guangxi provinces was the combined action of cations and anions. The regions with high sulfur dioxide emission tend to have higher concentrations in the rainwater. The only solu-tion to acid rain is to reduce the emission of sulfur dioxide.