区域环境与生态
曹启民,陈桂珠,缪绅裕.多环芳烃的分布特征及其与有机碳和黑碳的相关性研究——以汕头国际湿地示范区三种红树林湿地表层沉积物为例[J].环境科学学报,2009,29(4):861-868
多环芳烃的分布特征及其与有机碳和黑碳的相关性研究——以汕头国际湿地示范区三种红树林湿地表层沉积物为例
- Distribution and correlations of polycyclic aromatic hydrocarbons with organic carbon and black carbon in surface sediments of three mangrove wetlands in the Shantou Wetland Demonstration Site,China
- 基金项目：UNEP/GEF“南中国海”项目(No.GF/3010-07-03)
- 作者
- 单位
- 曹启民
- 中山大学环境科学与工程学院, 广州 510275
- 陈桂珠
- 中山大学环境科学与工程学院, 广州 510275
- 缪绅裕
- 广州大学生命科学学院, 广州 510006
- 摘要：野外采集了汕头国际湿地示范区内3种红树林湿地(苏埃湾天然次生桐花树林湿地、外砂河口人工种植海桑与无瓣海桑混交林湿地、义丰溪口人工无瓣海桑林湿地)的表层沉积物样品,在实验室内分析了沉积物的多环芳烃、有机碳和黑碳含量,研究了多环芳烃在3种不同红树林湿地沉积物中的分布特征,以及沉积物有机碳、黑碳与多环芳烃的相关性.结果表明:多环芳烃在天然次生红树林湿地沉积物中的累积量显著高于人工恢复红树林湿地沉积物的累积量;不同红树林湿地沉积物对多环芳烃的吸附和累积具有共同的特征,即多环芳烃的组成成分相似,主要组分为菲、荧蒽、芘和苯并(b)荧蒽;除义丰溪口红树林湿地外,多环芳烃在另外2个红树林湿地沉积物中吸附和累积都具有林内含量高于林边缘,林边缘含量高于低潮光滩的特征;有机碳和黑碳对低环多环芳烃的影响不显著,但对高环多环芳烃影响显著,黑碳较之有机碳对高环多环芳烃具有更强的吸附能力.
- Abstract：Distribution of Polycyclic Aromatic Hydrocarbons(PAHs)and correlation with Organic Carbon(OC)and Black Carbon(BC)were determined in surface sediment from three mangrove wetlands(Suai Wan Aegiceras corniculatum mangrove,Waisha estuarine Sonneratia caseolaris and Sonneratia Apetala mangrove,and Yifeng estuarine Sonneratia Apetala mangrove)inside the Shantou Wetland Demonstration Site,China.Results showed that concentrations of PAHs absorbed and accumulated by sediments of a natural mangrove forest wetland were higher than that of artificially restored mangrove forest wetlands.However,PAHcompositions in sediments were similar in the three mangrove wetlands.Total PAHs concentrations in inner mangrove sediment were higher than sediment at mangrove edges.Mangrove edge sediment had higher PAHlevels than low tidal mudflat sediment except for the Yifeng estuarine mangrove wetland.The high molecular weight PAHs(HPAHs)were strongly absorbed by organic carbon and black carbon.The low molecular weight PAHs(LPAHs)were not as strongly adsorbed as the HPAH’s.Sorption by BCwas greater than sorption by OC.
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