NDLI: Nutrient dynamics linked to hydrological condition and anthropogenic nutrient loading in Chaohu Lake (southeast China)

Content Provider	Springer Nature Link
Author	Chen, Xu Yang, Xiangdong Dong, Xuhui Liu, Qian
Copyright Year	2010
Abstract	Chaohu Lake, a large (770 km2) shallow lake in the Yangtze River basin, has experienced serious eutrophication over the past three decades. To track its nutrient history and the causes, multi-proxies (diatom, geochemical indicators, magnetic susceptibility, and grain size) were analyzed on a 120-cm long core from the lake. Nutrient dynamics of the past 500 years were reconstructed using sedimentary diatom assemblages and an established diatom-inferred total phosphorus (DI-TP) transfer function. Between about 1500 and 1740 AD, the lake remained in an upper-mesotrophic state with the DI-TP oscillating around 60 μg l−1. Together with enhanced agricultural activities, a drier and warmer climate led to a decrease in water level and water exchange volume with the Yangtze River, thus triggering the first phase of eutrophication (ca. 1740–1820 AD). After this eutrophic episode, the lake had exhibited a recovery in nutrient status until the 1960s. However, the lake became susceptible to nutrient input due to a sharp decrease in water exchange volume after its impoundment in 1962. A large amount of anthropogenic nutrient input has exacerbated eutrophication in the lake since the late 1970s. Redundancy analysis using a range of sedimentary proxies indicated that the two eutrophication phases were mainly attributed to anthropogenic nutrient loading and altered hydrological conditions. The hydraulic connection with the Yangtze River should be the primary self-adjustment mechanism of the lake against anthropogenic nutrient input.
Starting Page	223
Ending Page	234
Page Count	12
File Format	PDF
ISSN	00188158
Journal	Hydrobiologia
Volume Number	661
Issue Number	1
e-ISSN	15735117
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-10-26
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Diatoms Eutrophication Human activity Hydrological condition Redundancy analysis Chaohu Lake Zoology Ecology Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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