中文摘要：

采用网格法均匀布点采集了北京地区161个表土样品，测定了其中15种多环芳烃（PAHs）的浓度。利用因子分析一多元线性回归法解析出北京地区表土中PAHs的3种来源，并定量计算了3种源的贡献量。结果表明，北京地区表土中PAHs的特征污染源为煤炭燃烧佼通排放、焦炉及石油，3种源基于多元线性回归法的贡献率分别为48％、28％和24％，对15种PAHs总量的贡献量均值分别为16．36、4．63和3．70μg·kg^-1。燃煤／交通源表现为市中心源强高于郊区，焦炉源在大部分区县中存在单一高值点，石油源在市中心及五环外环带呈点状分布。据此推断，北京地区PAHs的源贡献与北京地区能源结构和功能区划有关，能源结构和功能区划的改善是控制北京地区表土中多环芳烃的有效途径。

英文摘要：

Factor analysis and multiple linear regression were applied to apportion sources of polyeyelie aromatic hydroearbons（PAHs） in surface soil of Beijing, China, based on the measured PAHs concentrations of 161 surface soil samples. Three factors were identified representing coal combustion/vehicle exhaust, coking and petroleum, respectively. The contributions based on multiple linear regression of major sources were quantified as 48% from coal/vehicle, 28% from coking, and 24% from petroleum, the mean contributions of the three sources were 16.36 μg·kg^-1, 4.63 μg·kg^-1 and 3.70 μg·kg^-1, respectively, which were compatible with PAHs emissions estimated based on coal consumption. High contributions of coal/vehicle source were found in the center of the city and petroleum source had a high contribution in and around the center of the city. The contribution of coking industry had a high point in almost every district, while punctual distribution was found in the center and out of the fifth round road for petrol source. It is concluded that PAHs in the surface soil have close relations with the structure of fuel consumption and the distribution of function zones, which means the improvement of the energy structure and the function zoning are the keys to reduce the PAHs pollution in surface soil of Beijing area.