NDLI: Sedimentary record of water column trophic conditions and sediment carbon fluxes in a tropical water reservoir (Valle de Bravo, Mexico)

Content Provider	Springer Nature Link
Author	Carnero Bravo, Vladislav Meri Ibarra, Martín Ruiz Fernández, Ana Carolina Sanchez Cabeza, Joan Albert Ghaleb, Bassam
Copyright Year	2014
Abstract	Valle de Bravo (VB) is the main water reservoir of the Cutzamala hydraulic system, which provides 40 % of the drinking water consumed in the Mexico City Metropolitan Area and exhibits symptoms of eutrophication. Nutrient (C, N and P) concentrations were determined in two sediment cores to reconstruct the water column trophic evolution of the reservoir and C fluxes since its creation in 1947. Radiometric methods ($^{210}$Pb and $^{137}$Cs) were used to obtain sediment chronologies, using the presence of pre-reservoir soil layers in one of the cores as an independent chronological marker. Mass accumulation rates ranged from 0.12 to 0.56 g cm$^{−2}$ year$^{−1}$ and total organic carbon (TOC) fluxes from 122 to 380 g m$^{−2}$ year$^{−1}$. Total N ranged 4.9–48 g m$^{−2}$ year$^{−1}$, and total P 0.6–4.2 g m$^{−2}$ year$^{−1}$. The sedimentary record shows that all three (C, N and P) fluxes increased significantly after 1991, in good agreement with the assessed trophic evolution of VB and with historic and recent real-time measurements. In the recent years (1992–2006), the TOC flux to the bottom of VB (average 250 g m$^{−2}$ year$^{−1}$, peaks 323 g m$^{−2}$ year$^{−1}$) is similar to that found in highly eutrophic reservoirs and impoundments. Over 1/3 of the total C burial since dam construction, circa 70,000 t, has occurred in this recent period. These results highlight the usefulness of the reconstruction of carbon and nutrient fluxes from the sedimentary record to assess carbon burial and its temporal evolution in freshwater ecosystems.
Starting Page	4680
Ending Page	4694
Page Count	15
File Format	PDF
ISSN	09441344
Journal	Environmental Science and Pollution Research
Volume Number	22
Issue Number	6
e-ISSN	16147499
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-10-21
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	$^{210}$Pb chronology Eutrophication Lake sediments Organic carbon fluxes Valle de Bravo reservoir Environment Environmental Chemistry Ecotoxicology Environmental Health Atmospheric Protection/Air Quality Control/Air Pollution Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis Pollution Medicine

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