南京市不同功能区林业土壤多环芳烃含量与来源分析  

Characterization and Sources of Polycyclic Aromatic Hydrocarbons in Urban Forestry Soil from Different Functional Areas of Nanjing City

作　　者：杨靖宇[1] 俞元春[1] 王小龙[1] 

机构地区：[1]南京林业大学南方现代林业协同创新中心,南京林业大学生物与环境学院,江苏南京210037

出　　处：《生态环境学报》2016年第2期314-319,共6页Ecology and Environmental Sciences

基　　金：国家自然科学基金项目(31270664;31511130024);高等学校博士学科点专项科研基金项目(20123204110004);江苏省普通高校研究生科研创新计划项目(CXZZ13_0533);江苏高校优势学科建设工程项目(PAPD)

摘　　要：城市林业土壤是城市绿色景观的重要载体,随着人们生态意识的增强,对城市林业土壤生态环境的关注也越来越多。为了解城市林业土壤中多环芳烃的污染情况和来源特征,以南京市城市林业土壤为研究对象,根据其分布特点对8类典型功能区进行采样,采用高效液相色谱法和分子标记物比值法,测定了土样中16种优先控制多环芳烃的含量,分析了城市林业土壤中多环芳烃污染水平、富集情况、分布情况及来源特征。结果表明:南京市城市林业不同功能区72个土壤样品的多环芳烃平均含量为(487.7±264.3)μg·kg^(-1),变化范围为156.7~1523.3μg·kg^(-1),各土样均受到污染,其中83.3%的样品呈轻度污染水平,不同功能区土壤PAHs污染程度存在差异;不同功能区城市林业表层土壤多环芳烃含量水平表现为:城市立交桥(949.3μg·kg^(-1))>道路绿化带(550.1μg·kg^(-1))>学校(525.4μg·kg^(-1))>居民区(513.0μg·kg^(-1))>发电厂(501.4μg·kg^(-1))>垃圾填埋厂(328.7μg·kg^(-1))>近郊森林(293.8μg·kg^(-1))>远郊森林(271.7μg·kg^(-1)),中层和下层土壤PAHs含量表现出类似规律;土样中PAHs含量与SOC和BC含量均表现显著相关性,相同的显著性检验水平下BC含量与PAHs含量具有较强相关关系。垃圾填埋场、发电厂、城市立交桥、居民区等功能区表层土壤表现出富集现象,其他功能区土壤表现出一定的逆向富集趋势。南京市城市林业土壤中PAHs来源以生物质和煤炭燃烧源及机动车排放源为主,少数土样存在石油源。Urban forestry soil is major medium of urban green landscape, with the enhancement of ecological and environmentalconsciousness, people pay more attention to urban forestry soil ecological environment. Urban forestry soil has its has its specialcharacteristics, and is seriously disturbed by man’s activities. Therefore, more soil environmental problems are appearing. In order tolearn more about the contamination level and characteristic of sources of polycyclic aromatic hydrocarbons （PAHs） in Nanjingforestry soil, samples of urban forestry soil in eight different functional areas were collected. The concentration of 16 prioritypolycyclic aromatic hydrocarbons （PAHs） in soil was detected by high performance liquid chromatography （HPLC）, characteristic ofenrichment and sources were analyzed by relative enrichment factors （lge） and isomeric ratios, respectively. The results showed thatthe total concentration of soil 16 PAHs ranged from 156.67 μg·kg-1 to 1 523.34 μg·kg-1, with an average value of （487.7±264.3）μg·kg-1 in Nanjing forestry soil, and 83.3% of soil samples were weakly contaminated, and pollution level are different in variousfunctional area. The total PAHs concentrations in topsoil were in the order of urban compass （949.3 μg·kg-1） 〉 road green belts（550.1 μg·kg-1） 〉 university （525.4 μg·kg-1） 〉 residential areas （513.0 μg·kg-1） 〉 power plant （501.4 μg·kg-1） 〉 landfill （328.7μg·kg-1） 〉 suburban forest （293.8 μg·kg-1） 〉 rural forest （271.7 μg·kg-1）,there are the same order in the middle layer and lower layer.There was significant association between w（PAHs） and both w（SOC） and w（BC）, while w（BC） showed a stronger correlation. PAHsparticularly accumulated in topsoil in landfill, power plant, urban overpass and residential areas, however PAHs enrichment appearedin lower layer in other functional areas. Though the soil PAHs sources of different functional areas were different, the main sourcesof them were

关 键 词：城市林业土壤 多环芳烃 来源 南京 

分 类 号：X53[环境科学与工程—环境工程]