External versus Internal Loads of Nutrients of an Urban Eutrophic Tropical Reservoir （Southeastern Brazil）  

作　　者：Antonio A. Mozeto MarceloMontini Simone A. Braz Felipe G. Martins Aloisio Soares Marcos Roberto L.do Nascimento Francisco Antonio R. Barbosd Pedro S. Fadini Bias M. de Faria 

机构地区：[1]Environmental Biogeochemistry Laboratory (LBGqA), Chemistry Department, Federal University of S6o Carlos (UFSCar), S~oCarlos SP13565-905, Brazil [2]Biological Sciences Institute (1CB), Federal University of Minas Gerais (UFMG), Belo Horizonte MG30161-970, Brazil [3]Povos de Caldas Laboratory (LAPOC), Brazilian National Commission for Nuclear Energy (CNEN), Pogos de CaldasMG37701-970, Brazil [4]Research and Development Center (CENPES)-Petrobras, Cidade Universit6ria, Rio de Janeiro RJ21941-915, Brazil

出　　处：《Journal of Environmental Science and Engineering(A)》2012年第5期598-610,共13页环境科学与工程（A）

摘　　要：This study aimed to evaluate the external and internal fluxes of nutrients of an urban eutrophic reservoir （lbirit6 reservoir, SE-Brazil）. External loads were estimated in the tributaries （Pintados and Ibirit6 creeks） through nutrient concentrations and discharge measurements. Using Fick＇s law, internal loads were estimated in the reservoir from fluxes across sediment-water interface from nutrient concentration gradients between the pore water and the water. The Ibirit6 creek （urban sewage recipient） contributes with 72%-47% of ammonium （NH4^＋） and 100%-8% of SRP （soluble reactive phosphorus） of the total quantity entering the reservoir, whereas the Pintados creek （oil refinery effluent recipient） contributions are 20%-19% and 44%-100%, respectively. Despite the high external loads （130 and 2.2 ton-yr^-1 of NH4＋ and SRP, respectively）, internal loads （average flux of 120 and 2 mg·cm^-2yr^-1, respectively） correspond to 25% of the total external loads which may sustain a high productivity in the reservoir for a long time even if the external loads are controlled. The stocks of ammonium and SRP of the interstitial water （100 cm of sediment） would be released to the water in six years and five months, respectively, The release time would be extremely larger （〉 3,000 years） considering the stocks of total N and bioavailable P.

关 键 词：External and internal nutrient loads biogeochemical assessments Ibirit6 reservoir （SE-Brazil） water quality. 

分 类 号：X703[环境科学与工程—环境工程] X524