摘要
采用实验室模拟的方法,研究颤蚓的扰动对松花江上游沉积物中Pb、Cd迁移过程的影响,并分析了Pb、Cd在生物体内的富集过程.结果表明,生物扰动带来的悬浮作用造成沉积物中Pb和Cd的释放,被释放的Pb和Cd主要吸附在悬浮颗粒中,在颤蚓体内的富集并不明显;而添加Pb后,颤蚓体内Pb浓度随时间延长明显增加,主要与颤蚓的新陈代谢方式有关.在没有生物扰动的处理中,显著增加的Pb主要集中在表层,而有生物扰动的处理中,在不同深度沉积物中均有增加.生物的扰动不仅显著增加了水中Pb和Cd浓度,而且促进水相中的Pb向沉积物深层的扩散.
Effects of bioturbation by worms on the transport of Pb and Cd in the sediments sampled from the upstream of Songhua River were studied by the simulated testing,and the contents of Pb,Cd in worms were analyzed too.The results showed that bioturbation to sediment suspension would promote the release of Pb and Cd on the sediments.Pb and Cd derived from sediments were adsorbed on the suspending particalates,but not enriched in the worms.The contents of Pb in worms were markedly increased with exposure time when Pb was added into overlying water,mainly ascribed to the metabolic way of worms.Higher concentrations of Pb were oberserved only on the surface of sediments in the treatment without worms but in different depths with worms.Bioturbation not only increased significantly concentrations of Pb and Cd in waters,but promoted the diffusion from overlying waters to deeper parts of sediments.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2010年第2期251-255,共5页
China Environmental Science
基金
国家"973"项目(2004CB418502)
中国科学院重要方向性项目(KZCX2-YW-Q06-03)
关键词
生物扰动
沉积物
重金属
迁移
bioturbation
sediment
heavy metals
transport
