Benthic fluxes in a subtropical reservoir estimated by pore-water diffusion calculation

Autor: Daniele Frascareli, Sheila Cardoso-Silva, Erik Sartori Jeunon Gontijo, Darllene Silveira Melo, João Carlos Alves Macedo, Manuel Enrique Gamero Guandique, Viviane Moschini Carlos, Kurt Friese, André Henrique Rosa
Přispěvatelé: Universidade Estadual Paulista (UNESP), Federal University of Acre (UFAC), Universidade de São Paulo (USP), UFZ-Helmholtz Centre for Environmental Research
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Scopus
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
Popis: Made available in DSpace on 2022-04-28T19:52:23Z (GMT). No. of bitstreams: 0 Previous issue date: 2022-04-01 Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Deutscher Akademischer Austauschdienst Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) The internal load of metals and nutrients in reservoirs can be derived from fluxes at the sediment–water interface via pore water (PW) and may affect the water quality. The main goal of this study was to investigate the distribution and fluxes of nutrients and metals at SWI in a subtropical reservoir. Sediments cores were collected at five sites in Itupararanga Reservoir and sliced at 1-cm depth intervals (2-cm from 6 cm deep). PW was extracted and analysed by its dissolved cations (Ca2+, Mg2+, Na+, K+) metals (Al, Ba, Cr, Cu, Fe, Mn, Ni e Zn), nutrient (total dissolved phosphorus, soluble reactive phosphorus-SRP; NO3; NH4+) and C content. The sediments were analysed by porosity, particle size distribution and contents of C, N and P. Fluxes at SWI were calculated using Fick's law in one dimension. P was being released to the water column at Core 5, by the mineralisation of OM by oxic pathways and retained at Core 2. Although Core 4 had high P concentration on PW, no results of flux was possible due to lack on bottom water data. No concentration of SRP was detected in PW of Core 1 and 7. Release of Fe, Mn, Zn and Cr was also observed. SRP was absent at the most eutrophic site (Core 1). The contribution of 74.83 mg m−2 SRP day−1 at Core 2 was potentially harmful to water quality. This study showed the importance of investigating sediment interstitial water and expanded a discussion in sub-climatic environments on the release and contribution of sediments in the geochemistry of P in aquatic ecosystems. Institute of Science and Technology São Paulo State University (UNESP) AvenidaTrês de Marco, 511 Alto da Boa Vista, SP Program in Ecology and Natural Resource Management Rodovia BR 364 Federal University of Acre (UFAC), Km 04 - Distrito Industrial, AC University of São Paulo (USP) Oceanographic Institute. Praça Do Oceanográico, 191 - Butantã, SP Department Lake Research UFZ-Helmholtz Centre for Environmental Research, Brückstraße 3a Institute of Science and Technology São Paulo State University (UNESP) AvenidaTrês de Marco, 511 Alto da Boa Vista, SP CNPq: 158227/2018-2 FAPESP: 16/15397-1 FAPESP: 18/20326-1 Deutscher Akademischer Austauschdienst: 57414997 CAPES: 88887.122769/2016-00 CAPES: 88887.141964/2017-00 CAPES: 88887.165060/2018-00 CAPES: 99999.008107/2015-07
Databáze: OpenAIRE
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