The lacustrine sedimentary records of coal-burning atmospheric pollution
Tóm tắt
Based on the studies on diatom, ostracods and magnetism on a core acquired from lacustrine sediments, as well as correlation analysis between concentration of acid diatom and the instantaneous lowest pH value, the processes of environment evolution in Lake Yangzonghai were reconstructed. The lacustrine environment was favorable in the 1950s, and began to be polluted by a coal-burning power plant since 1960. During 1965–1980, the instantaneous lowest pH value of lake water decreased to 5–6 when heavily polluted. There was a decrease trend in the pollution from 1983 to 1999, but coal-burning atmospheric pollution was still a main problem for environmental retrieving. As acid precipitated, acid-tolerant species overspread, and shellfish disappeared, as well as ferromagnetic particulates dissolved because of the consequent change of pH-Eh values in the interface of water and soil, which results in the change of environmental proxies versus depth. Thus, the environmental evolution of Lake Yangzonghai is reconstructed in this paper based on the inferences mentioned above.
Tài liệu tham khảo
Wang, Y., Zhu, Y., Pan, H. et al., Environmental characteristics of an acid Qinghai Lake in Tengchong, Yunnan Province, China, Journal of Lake Sciences (in Chinese), 2002, 14(2): 117–124.
Li, Y., The effects of acid deposition towards water ecosystem. Acid Rain Collected Works (ed. Environmental Sciences Association of China) (in Chinese), Beijing: Environmental Sciences Publishing House, 1989, 435–444.
Li, S., Yu, M., Li, Z. et al., The Investigationgs on Yunnan Plateau, China, Chinese Oceanography and Limnology (in Chinese), 1963, 5(2): 87–113.
Battarbee, R. W., Diatom analysis, in: Handbook of Holocene Pa-laeoecology and Palaeohydrology (ed. Berglund, B.E.), Chichester: Wiley, 1986, 527–570.
Xiang, L., Wang, S., Xue, B., Accumulation and time marker significance of Chernobyl-dirived from 137Cs in lake sediments in Jiangsu-Anhui, Chinese Oceanography and Limnology (in Chinese), 1996, 27(2): 132–137.
Psenner, R., Schmidt, R., Climate-driven pH control of remote alpine lakes and effects of acid deposition, Nature, 1992, 356(30): 35–40.
Wunsam, S., Schmidt, R., Klee, R., Cyclotella-taxa (Bacillario-phyceae) in lakes of the Alpine region and their relationship to environmental variables, Aquatic Sciences, 1995, 57(4): 362–386.
Findlay, D. L., Shearer, J. A., Relationships between sedimentary diatiom assemblages and lake-water pH values in the Experimental Lakes Area, J. Paleolimnology, 1992, 7: 145–156.
Jiao, X., The Chronicles of Algae in Fresh Water (Vol.4) (in Chinese), Beijing: Science Press, 1995, 42–46.
Haines, T. A., Acid precipitation and its consequences for aquatic ecosystems: a review, Trans. Amer. Fish. Soc., 1981, 110: 669–707. [DOI]
Cameron, E. M., Prevost, C. L., Curdy, M. M. et al., Recent (1930s) natural acidification and fish-kill that was an Important food source for an Inuit community in northern Quebec, Canada, J. Geochemcal Exploration, 1998, 64(1–3): 197–213. [DOI]
Driscoll, C. T., Baker, J. P., Briscognt, J. J. et al., Effects of aluminum speciation on fish in dilute acidified waters, Nature, 1980, 284: 164–170. [DOI]
Yu, Y., Walter, G., Koen, M., Effects of genotype and environment on phenotypic variability in Limnocythere inopinata (Crustacea: Ostracoda), Hydrobiologia, 1999, 400: 85–114. [DOI]
Hu, S., Wang, Y., Appel, E. et al., Magnetic, Geochemical, and biological processes towards acidification of Yangzonghai Lake caused by a power plant in Yunnan, southwestern China, Physics and Chemistry of the Earth, 2003, 28: 711–717.
Hu, S., Deng, C., Appel, E. et al., Environmental magnetic study on lacustrine sediments, Chinese Science Bulletin, 2002, 49(7): 613–616.
Zhu, H., Chen, Y., Pu, P. et al., The Environment and Sedimentation of the Fault-Downthrown Lakes in Yunnan, China (in Chinese), Beijing: Sciences Press, 1989, 340–344.
Wan, X., Wan, G., Huang, R. et al., Biogeochemical effect on postdepositional remobilization of Fe-Mn in lake Aha, Guizhou Province, Journal of Lake Sciences (in Chinese), 1997, 9(2): 129–134.
Zhang, X., Wang, Y., Lei, H., Authigenic mineralogy, depositional environments and evolution of fault-bounded lakes of the Yunnan Plateau, southwestern China, Sedimentology, 1996, 43: 367–380. [DOI]
Wang, Y., Zhu, Y., Yin, Y. et al., Research progress in surface water acidification and study on environmental information from lake acidification, Advance in Earth Sciences (in Chinese), 2001, 16(3): 421–426.
Leavitt, P. R., Findlay, D. L., Hall, R. I., Algal responses to dissolved organics loss and pH decline during whole-lake acidification: evidence from paleolimnology, Limnol. Oceanogr., 1999, 44: 757–773.