中文摘要：

土壤是环境中多环芳烃（PAHs）的储库和中转站，本文调查了辽河流域表层土壤（0～20cm）中PAHs的含量水平及其空间分布规律。结果表明，辽河流域土壤已经受到一定程度的PAHs污染，其表土16种PAHs总量为285～8347μg·kg^-1，平均含量为2292μg·kg^-1,沈阳和抚顺市区是土壤PAHs含量超标最严重的区域。在此基础上，参照荷兰环境标准，对区域表层土中10种PAHs的污染现状进行了评价。结果显示，10种被评价的PAHs组分都存在超标点，其中，菲（Phe）和荧蒽（Fla）的超标最为普遍，超标率为100％；其次是麓（Chy）、蒽（An）和萘（Nap）。辽河流域表土的PAHs污染来源主要是燃烧源和交通源。

英文摘要：

Soil is the storage pool and transfer station of polycyclic aromatic hydrocarbons （PAHs） in the environment. Concentrations and spatial distributions of PAHs in the topsoil （0～20 cm） in Liao River basin, the important industrial and mining areas of Northeast China, were investigated. Results showed that soils in Liao River basin had been contaminated by PAHs to some degree. The concentrations of total 16 PAHs （TPAHs） listed in the USEPA ranged from 285 μg·kg^-1 to 8 347 μg·kg^-1, with the average of 2 292 μg·kg^-1 And the concentration of TPAHs in the city zone especially for Shenyang and Fushun was high, but were relatively high and low in the suburban zone and the remote county zone, respectively. The percentage of high molecular weight PAHs （n≥ 4） of TPAHs in Liao River basin topsoils was 65.2%. Based on the soil quality standard of Netherlands, 10 out of the USEPA 16 PAHs in the topsoil of Liao River basin were evaluated, suggesting that several PAHs exceeded the standard thresholds. Phenathrene （Phe） and fluoranthene （Fla） concentrations widely exceeded the environmental standard by 100%, with chrysene （Chy）, anthracene（An）, and naphthalene （Nap） as the next. The main source of PAHs contaminants in the Liao River basin was from combustion and traffic exhaust.