中国环境科学
中國環境科學
중국배경과학
CHINA ENVIRONMENTAL SCIENCE
2010年
2期
251-255
,共5页
生物扰动%沉积物%重金属%迁移
生物擾動%沉積物%重金屬%遷移
생물우동%침적물%중금속%천이
bioturbation: sediment%heavy metals%transport
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.
採用實驗室模擬的方法,研究顫蚓的擾動對鬆花江上遊沉積物中Pb、Cd遷移過程的影響,併分析瞭Pb、Cd在生物體內的富集過程.結果錶明,生物擾動帶來的懸浮作用造成沉積物中Pb和Cd的釋放,被釋放的Pb和Cd主要吸附在懸浮顆粒中,在顫蚓體內的富集併不明顯;而添加Pb後,顫蚓體內Pb濃度隨時間延長明顯增加,主要與顫蚓的新陳代謝方式有關.在沒有生物擾動的處理中,顯著增加的Pb主要集中在錶層,而有生物擾動的處理中,在不同深度沉積物中均有增加.生物的擾動不僅顯著增加瞭水中Pb和Cd濃度,而且促進水相中的Pb嚮沉積物深層的擴散.
채용실험실모의적방법,연구전인적우동대송화강상유침적물중Pb、Cd천이과정적영향,병분석료Pb、Cd재생물체내적부집과정.결과표명,생물우동대래적현부작용조성침적물중Pb화Cd적석방,피석방적Pb화Cd주요흡부재현부과립중,재전인체내적부집병불명현;이첨가Pb후,전인체내Pb농도수시간연장명현증가,주요여전인적신진대사방식유관.재몰유생물우동적처리중,현저증가적Pb주요집중재표층,이유생물우동적처리중,재불동심도침적물중균유증가.생물적우동불부현저증가료수중Pb화Cd농도,이차촉진수상중적Pb향침적물심층적확산.
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.