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

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• 作者：Vladislav Carnero-Bravo…
• 关键词：210Pb chronology ; Eutrophication ; Lake sediments ; Organic carbon fluxes ; Valle de Bravo reservoir
• 刊名：Environmental Science and Pollution Research
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：22
• 期：6
• 页码：4680-4694
• 全文大小：632 KB
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• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Atmospheric Protection, Air Quality Control and Air Pollution
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  Industrial Pollution Prevention
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1614-7499

文摘

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 (210Pb and 137Cs) 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? year? and total organic carbon (TOC) fluxes from 122 to 380?g?m??year?. Total N ranged 4.9-8?g?m??year?, and total P 0.6-.2?g?m??year?. 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 (1992-006), the TOC flux to the bottom of VB (average 250?g?m??year?, peaks 323?g?m??year?) 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.