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

Content Provider	Springer Nature Link
Author	Jinglu, Wu Gagan, Michael K. Xuezhong, Jiang Weilan, Xia Sumin, Wang
Copyright Year	2004
Abstract	Geochemical anomalies and stable isotope ratios (δ$^{18}$O, δ$^{13}$C) in authigenic carbonates and organic matter (δ$^{13}$C) 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, CaCO$_{3}$, and pigment concentrations, and lower δ$^{18}$O and δ$^{13}$C values in authigenic calcite (1940–1999 AD). The unanticipated lowering of δ$^{18}$O and δ$^{13}$C 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$_{3}$ $^{2−}$] 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.
Starting Page	85
Ending Page	94
Page Count	10
File Format	PDF
ISSN	09212728
Journal	Journal of Paleolimnology
Volume Number	32
Issue Number	1
e-ISSN	15730417
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2004-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Geochemistry Hydrogeology Meteorology/Climatology Sedimentology Hydrobiology
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Aquatic Science

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