Mass balance of nutrients during the filling phase of two reservoirs of Sistema Produtor Alto Tiet那 (SPAT) = Balan o de massa de nutrientes na fase de enchimento de dois reservat車rios do Sistema Produtor Alto Tiet那 (SPAT)

作者：Valeria Cope; Cacilda Thais Janson Mercante; Clovis Ferreira do Carmo; Suzana Sendacz

来源：Acta Scientiarum - Biological Sciences, 2011.

• water supply
• nitrogen
• phosphorus
• abastecimento
• nitrogenio
• fosforo

Paraitinga and Biritiba reservoirs are part of Sistema Produtor Alto Tiet那 and they play an important role at the public water supply. The purpose of this study is to understand the mass balance of nitrogen and phosphorus that can influence the eutrophication process in reservoirs during the filling phase, and provide information for the implementation of mechanisms to manage water quality. Water samples were collected from August 2005 until May 2006. Concentrations of total phosphorus (PT) and total nitrogen (NT) were measured and the mass balance and loads were estimated. Paraitinga reservoir presented retention of NT and PT during the dry season and export during therainy season; whilst at Biritiba reservoir we evidenced retention of NT and PT for both dry and rainy seasons. The annual balance demonstrated that during the reservoirs filling process, the systems retain NT and PT. The retention of nutrients into the system indicatesthat the environments have been modified leading to eutrophication and its consequences, and that it is necessary to outline strategies in order to mitigate the problem and suggest implementation of techniques to reduce the diffuse load. Os reservat車rios Paraitinga e Biritiba est o inseridos no Sistema Produtor Alto Tiet那, com elevada importancia para o abastecimento p迆blico. O objetivo do trabalho foi compreender o balan o de massa donitrog那nio e f車sforo os quais podem influenciar o processo de eutrofiza o em reservat車rios durante o enchimento e subsidiar informa es para implanta o de mecanismos de gerenciamento da qualidade de 芍gua. Coletas trimestrais de 芍gua foram realizadas no per赤odo de um ano de agosto/2005 a maio/2006. As concentra es de f車sforo total (PT) e nitrog那nio total (NT) foram medidas, e estimadas as cargas e o balan o de massa. O reservat車rio Paraitinga indicou reten o de NT e PT no per赤odo seco, e exporta o no chuvoso, e reten o de NT e PT para o per赤odo seco e chuvoso em Biritiba. O balan o anual demonstrou que durante o processo de enchimento dos reservat車rios, os sistemas funcionaram armazenando NT e PT. Acaracter赤stica de reten o de nutrientes no sistema sinaliza para os gestores que os ambientes sofrem um processo em dire o 角 eutrofiza o e suas consequ那ncias, necessitando, de estrat谷giaspara mitigar o problema, sugerindo-se implanta o de t谷cnicas para redu o da carga difusa.