External versus Internal Loads of Nutrients of an Urban Eutrophic Tropical Reservoir （Southeastern Brazil）
External versus Internal Loads of Nutrients of an Urban Eutrophic Tropical Reservoir （Southeastern Brazil）作者机构：Environmental Biogeochemistry Laboratory (LBGqA) Chemistry Department Federal University of S6o Carlos (UFSCar) S~oCarlos SP13565-905 Brazil Biological Sciences Institute (1CB) Federal University of Minas Gerais (UFMG) Belo Horizonte MG30161-970 Brazil Povos de Caldas Laboratory (LAPOC) Brazilian National Commission for Nuclear Energy (CNEN) Pogos de CaldasMG37701-970 Brazil Research and Development Center (CENPES)-Petrobras Cidade Universit6ria Rio de Janeiro RJ21941-915 Brazil
出 版 物：《Journal of Environmental Science and Engineering(A)》 (环境科学与工程（A）)
年 卷 期：2012年第1卷第5期
页 面：598-610页
学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 0815[工学-水利工程]
主 题：External and internal nutrient loads biogeochemical assessments Ibirit6 reservoir (SE-Brazil) water quality.
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.
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