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Sedimentary geochemical evidence for recent eutrophication of Lake Chenghai, Yunnan, China

Journal Article


Abstract


  • Geochemical anomalies and stable isotope ratios (δ18O, δ13C) in authigenic carbonates and organic matter (δ13C) from a 660-year sediment core from Lake Chenghai, southern China, provide a continuous history of recent lake eutrophication. The multi-proxy geochemical and isotopic record can be divided into a three-part history of contrasting limnological development, including: (1) a clear-water, oligotrophic open lake system (1340 and 1690 AD); (2) an environmentally unstable, hydrologically closed, oligotrophic lake system (1690-1940 AD); and (3) an increasingly eutrophic, closed lake system marked by higher organic matter, nitrogen, CaCO3, and pigment concentrations, and lower δ18O and δ13C values in authigenic calcite (1940-1999 AD). The unanticipated lowering of δ18O and δ13C of authigenic calcite during eutrophication is thought to be the result of disequilibrium water-carbonate fractionation of oxygen and carbon isotopes during periods of elevated primary production, pH, and [CO 32-] activities in the water column. The recent eutrophication of Lake Chenghai indicated by these geochemical proxies is essentially simultaneous with large-scale human migration and the application of agricultural fertilizers in the catchment area during the 20th century.

Publication Date


  • 2004

Citation


  • Jinglu, W., Gagan, M. K., Xuezhong, J., Weilan, X., & Sumin, W. (2004). Sedimentary geochemical evidence for recent eutrophication of Lake Chenghai, Yunnan, China. Journal of Paleolimnology, 32(1), 85-94. doi:10.1023/B:JOPL.0000025290.09365.98

Scopus Eid


  • 2-s2.0-3442889142

Web Of Science Accession Number


Start Page


  • 85

End Page


  • 94

Volume


  • 32

Issue


  • 1

Abstract


  • Geochemical anomalies and stable isotope ratios (δ18O, δ13C) in authigenic carbonates and organic matter (δ13C) from a 660-year sediment core from Lake Chenghai, southern China, provide a continuous history of recent lake eutrophication. The multi-proxy geochemical and isotopic record can be divided into a three-part history of contrasting limnological development, including: (1) a clear-water, oligotrophic open lake system (1340 and 1690 AD); (2) an environmentally unstable, hydrologically closed, oligotrophic lake system (1690-1940 AD); and (3) an increasingly eutrophic, closed lake system marked by higher organic matter, nitrogen, CaCO3, and pigment concentrations, and lower δ18O and δ13C values in authigenic calcite (1940-1999 AD). The unanticipated lowering of δ18O and δ13C of authigenic calcite during eutrophication is thought to be the result of disequilibrium water-carbonate fractionation of oxygen and carbon isotopes during periods of elevated primary production, pH, and [CO 32-] activities in the water column. The recent eutrophication of Lake Chenghai indicated by these geochemical proxies is essentially simultaneous with large-scale human migration and the application of agricultural fertilizers in the catchment area during the 20th century.

Publication Date


  • 2004

Citation


  • Jinglu, W., Gagan, M. K., Xuezhong, J., Weilan, X., & Sumin, W. (2004). Sedimentary geochemical evidence for recent eutrophication of Lake Chenghai, Yunnan, China. Journal of Paleolimnology, 32(1), 85-94. doi:10.1023/B:JOPL.0000025290.09365.98

Scopus Eid


  • 2-s2.0-3442889142

Web Of Science Accession Number


Start Page


  • 85

End Page


  • 94

Volume


  • 32

Issue


  • 1