RCEES OpenIR  > 环境水质学国家重点实验室
Thesis Advisor杨敏 ; 王东升
Degree Grantor中国科学院生态环境研究中心
Place of Conferral北京
Degree Name理学
Degree Discipline生物学
Keyword生物扰动,重金属,形态,迁移转化 bioturbation, Heavy Metal, Speciation, Migration And Transformation


Other Abstract

      Biodisturbance is one of the important factors affecting the migration and transformation of heavy metals in sediments. The behavior of benthic organisms affects the occurrence and distribution of heavy metals in sediments, and thus changes the migration and transformation process of heavy metals in sediments. At the same time, pollutants in the environment can affect the behavior of benthic organisms by producing toxicity and changing their living habits or causing stress reactions.
      The effects of ageing time on the morphology and distribution of heavy metals in sediments were studied. The results showed that the ageing time had little effect on the morphology distribution of Tl in sediments, but for Cd, Cu, Zn and Pb, the longer the ageing time was, the more the ratio of acid extractable state to Fe/Mn oxide state decreased, and the four heavy metals in sediments would exist in more stable oxidizable and residual states. Meanwhile, the effects of bioturbation on the migration and transformation of heavy metals in sediments at three different ageing times were studied. Results showed that with the bioturbation in the sediment, pH of sediment, particle size and structure have changed. Also the heavy metal in sediments, on the one hand, were more likely to be in the form of dissolved to release to overlying water, on the other hand, bioturbation in the increase in the surface sediment acid can be extracted with Fe/Mn oxide states the content of heavy metals.
      Then, using anatoxin-a, a neurotoxin, and microcystin-LR, classified as hepatotoxin, as adnexal pollutants, the mechanism of heavy metals migration and transformation in sediments by bioturbation of Tubificids (Tubifex tubifex) and Chironomid larvae (Chironomus plumosuswas) were studied. According to dissolved and total heavy metals concentrations in the overlying water, pH values and grain size of sediment, as well as the formation distribution of heavy metals in surface sediments, it showed that the microcystin-LR and anatoxin-a produced corresponding toxicity on Tubificids and Chironomid larvae, changed their behavior, and the effect produced by anatoxin-a is significantly than the microcystin-LR. Compared with the Chironomid larva, the stress response of Tubificids was stronger.

Document Type学位论文
Recommended Citation
GB/T 7714
何怡. 生物扰动过程中沉积物重金属的迁移转化机制[D]. 北京. 中国科学院生态环境研究中心,2019.
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何怡-生物扰动过程中沉积物重金属的迁移转(5817KB)学位论文 开放获取CC BY-NC-SAApplication Full Text
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