珠江口滩涂湿地土壤重金属分布及其对围垦的影响  

Heavy Metal Distribution in Tidal Wetland Soils and Its Effect on Reclamation in the Pearl River Estuary

作　　者：李取生[1] 楚蓓[1] 石雷[1] 房剑红[1] 蔡莎莎[1] 

机构地区：[1]暨南大学环境工程系,广东广州510632

出　　处：《农业环境科学学报》2007年第4期1422-1426,共5页Journal of Agro-Environment Science

基　　金：暨南大学引进优秀人才科研启动基金项目(51205032);中国科学院东北地理与农业生态研究所湿地生态与环境重点实验室基金项目(WELF-2004-B-011)

摘　　要：通过系统取样和原子分光光度法测试,对珠江口滩涂湿地土壤重金属分布及其对围垦的影响进行了研究。结果显示,珠江口滩涂湿地土壤127个表层样品中Zn、Cr、Cu、Ni、Pb、Cd的平均含量分别为305.4、80.3、70.2、69.4、35.1、3.98mg·kg^(-1),其空间分布主要受排污口、围垦、潮滩位置和土壤粘土含量控制。滩涂湿地土壤受Cd、Zn、Ni污染十分严重,对围垦带来了严重的生态风险。Tidal wetland reclamation is one of the best methods to keep the arable land amount stable in coastal areas of China. The tidal wetland in the Pearl River estuary has been mainly reclaimed into crop land and meanwhile served as one of the main uhimate sinks for large amount of heavy metals discharged from the rapidly developing economic Pearl River Delta. But the wetland soil environmental quality and its effect on reclamation was known little. The heavy metal distribution in tidal wetland soils was investigated through detailed field sampling and AAS measurement. Average concentrations ofZn, Cr, Cu, Ni, Pb and Cd from 127 surface soil samples were 305.4, 80.3, 70.2, 69.4, 35.1 and 3.98 rag· kg^-1 respectively. The heavy metal concentrations varied with different types of wetland, and their distributions were controlled by local sewage outlet, reclamation, location on tidal flat and the content of soil clay. The wetland soils were significantly polluted by Cd, Zn and Ni, which would result in ecological risk for the current reclamation.

关 键 词：滩涂湿地土壤 重金属 污染 围垦 珠江口 

分 类 号：X833[环境科学与工程—环境工程]