北京市近年来大气降尘变化规律及趋势

根据北京市多年监测的降尘数据,对北京市城近郊区及远郊区的降尘量进行了统计分析,找出了北京市近15年来降尘的总体变化规律;利用方差分析方法检验了不同季节降尘的显著性差异,发现春季降尘量最大;找出了不同功能区的降尘变化规律,发现工业区的降尘量最大,而且不同行政区的功能区之间也存在差别。最后根据秩相关系数法对其进行了趋势分析,结果表明,北京市的降尘呈下降趋势。

The Changing Law and Trend of Dustfall in Being During the Recent Years

Based on the data gained from many years monitoring,the amount of dustfall in urban and rural of Beijing is statistically analyzed in this paper and the changing law of the dustfall during the recent fifteen years is given.Analysis of variance is used to find the significance among the different seasons and we find the amount of dustfall in spring gets maximum value.The changing law of the dustfall according to the different function areas is also found and the analysis shows the amount of dustfall in industrial areas is most serious and there is difference among founctin areas in different district.Moreover the changing trend is analyzed by rank correlation coefficient method.It is shown in the result that the amount of dustfall trends downwards in BeiJing.