NDLI: A geochemical record of recent anthropogenic nutrient loading and enhanced productivity in Lake Nansihu, China

Content Provider	Springer Nature Link
Author	Liu, Enfeng Shen, Ji Zhang, Enlou Wu, Yanhong Yang, Liyuan
Copyright Year	2009
Abstract	Total organic carbon (TOC), total nitrogen (TN), stable carbon and nitrogen isotopes (δ$^{13}$C, δ$^{15}$N), total phosphorus (TP) and organic phosphorus (OP) were measured in surface sediments and two short cores (DU-3 and WS-4) from Lake Nansihu, China to infer historical changes in anthropogenic nutrient inputs and corresponding shifts in lake primary productivity. Results indicate that organic matter preserved in the sediments is mainly autochthonous and that analyzed sediment variables were affected little by post-burial diagenesis. Increasing TOC, TN, OP and TP concentrations since the 1940s reflect increased P loading and elevated lake productivity. The δ$^{13}$C values varied from −21.5 to −26.6‰ in the two sediment cores. Values were relatively more negative before the 1940s, but thereafter increased until the mid-1980s, reflecting elevated lake productivity. Since the mid-1980s, δ$^{13}$C values remained relatively constant in core WS-4 and decreased in core DU-3, perhaps reflecting a change in the phytoplankton community. The δ$^{15}$N values ranged from −0.5 to 1.3‰ in core DU-3 and from 1.2 to 2.5‰ in core WS-4 before the mid-1980s, and increased to between 2.1 and 8.0‰ and 5.2 and 7.8‰, respectively, thereafter. Topmost sediments in the two cores display δ$^{15}$N values similar to those recorded in the surface sediments (5.5–7.5‰). Higher δ$^{15}$N values in recent deposits correspond to greater nitrogen concentration in water, and likely indicate anthropogenic nitrogen input, mainly from human and animal wastes.
Starting Page	15
Ending Page	24
Page Count	10
File Format	PDF
ISSN	09212728
Journal	Journal of Paleolimnology
Volume Number	44
Issue Number	1
e-ISSN	15730417
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-09-22
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sediment TOC and TN δ$^{13}$C and δ$^{15}$N Phosphorus Productivity Anthropogenic nutrient inputs Lake Nansihu Geology Freshwater & Marine Ecology Physical Geography Climate Change Sedimentology Paleontology
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Aquatic Science

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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