湖北农村降水中SO_4~(2-)浓度变化研究

在湖北农村 10个地点 ,利用澳大利亚集雨器自 1996年 1月至 1998年 6月 ,按季度采集大气降水样品测定SO2 - 4浓度 ,并对数据进行统计分析。研究结果表明 ,各地 1997年降水中SO2 - 4浓度年均值比 1996年显著升高 ;大多数地点 1996、1997、1998年 1季度和 2季度降水中SO2 - 4浓度呈逐年升高趋势 ;大多数地点每年 1、4季度降水中SO2 - 4浓度高 ,2、3季度降水中SO2 - 4浓度低 ,说明湖北农村降水中的硫对秋冬作物影响比对春夏作物影响大 ;湖北农村降水中SO2 - 4浓度近两年不仅有时间变化规律 ,而且同一季度内的地区差异也很明显 ,在 1996年和 1997年 8个季度 10个点的降水SO2 - 4浓度最大值中 ,有 4个最大值出现在襄樊 ,它是目前湖北继宜昌市区、恩施市区之后又一个酸雨发展较快的地区

CHANGES OF SO_4~2- CONCENTRATION IN RAINFALL IN RURAL AREA OF HUBEI PROVINCE

From January 1996 to June 1998, using rain collectors made in Australia we gathered rainfall samples from Hubei province where we arranged 10 sites in rural area and analysed the data by statistic methed. The results de monstrated that the mean values of SO 2- 4 concentration in all rainfall samples distinctly increased in 1997 compared with those in year of 1996. In spring and summer seasons the SO 2- 4 concentration increasing year after year was observed for a period of three years. The regular sulfur change pattern in rainfall must have stronger effect on autumn and winter crops than on spring and summer crops. Besides the SO 2- 4 concentration values of samples collected from differente regions were obviously disparate in the same season. Among all eight maximum values of SO 2- 4 concentration gathered from 10 sites in two test years (altogether eight seasons) four of them occured in Xiangfan district,where acid rain has takes place much more frequently right now.