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• W2037466181 abstract "Nutrient dynamics in lake systems are influenced by the loading of sediment-associated phosphorus (P) from both internal and external sources. Despite efforts to control lake productivity through reductions in external P loading, water quality problems persist in some lakes due to high internal loading of P from bottom sediment. The present study examines the spatial distribution of chemically defined P forms (NH4Cl-RP, BD-RP, NaOH-RP, HCI-RP, and NaOH(S5)-RP) in bottom sediments of two noncalcareous Canadian Shield Lakes. Sediment P data are related to some of the physical and chemical variables that control internal P loading in lakes. The BD-RP and NaOH-RP forms are related to water depth and nonresidual iron and aluminum content of sediment. Approximately 80% of the total extractable P in the Muldrew Lakes sediment was bioavailable P (NH4Co-RP + BD - RP + NaOH - RP), which is about twice that reported in the literature for calcareous lakes. In order to model P cycling in the Muldrew Lakes, further research is required to determine the internal supply of P from the lakes' sediments and potential anthropogenic inputs ofP from private sewage disposal systems.La dynamique des nutriments dans un lac est influencee par I'apport en phosphore (P) provenant de sources internes et externes. Malgre les efforts deployes pour controler le taux de P par reduction de I'apport externe, la qualitye de I'eau demeure un probleme dans certains lacs a cause de la contribution interne provenant de la sedimentation de fond. Cette etude examine la distribution spatiale de formes chimiquement definies de P (NH4CI-RP, BD-RP, NaOH-RP, HCI-RP, and NaOH(85)-RP) presentes dans les sediments de fonds de deux lacs non-calcaires du Bouclier Canadien. Les contenus en P des sediments sont relies a certaines variables physiques et chimiques qui controlent I'apport interne des lacs. Le Bd-RP et le NaOH-RP sont relies a la profondeur de I'eau ainsi qu'aux contenus non-residuels de fer et d'aluminium du sediment. Environ 80% du P pouvant etre extrait du sediment des lacs Muldrew eait du P (NH4Cl-RP + BD-RP + NaOH-RP) biodisponible. Ceci represente le double de ce qui est rapporte dans la litteature pour des lacs calcaires. Afin de construire un modele du cycle du P dans les lacs Muldrew, il est important de determiner I'apport interne de P provenant de la sedimentation et les sources anthropiques potentielles provenant des systemes d'egouts prives." @default.
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• W2037466181 date "1996-09-01" @default.
• W2037466181 modified "2023-09-27" @default.
• W2037466181 title "SPATIAL VARIATION AND DISTRIBUTION OF PHOSPHORUS FORMS IN BOTTOM SEDIMENTS OF TWO CANADIAN SHIELD LAKES" @default.
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• W2037466181 doi "https://doi.org/10.1111/j.1541-0064.1996.tb00452.x" @default.
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