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A comparison of phosphorus retention in lakes determined from mass balance and sediment core calculations

Show simple item record Dillon, P. J. Evans, H. E.
dc.coverage.spatial Ontario
dc.coverage.spatial South-central Ontario 2019-03-14T17:50:44Z 2019-03-14T17:50:44Z 1992 1992-07
dc.description.abstract Phosphorus retention (TPacc) was determined in 7 lakes in Ontario, Canada from mass balances and from the direct measurement of phosphorus accumulation in the sediments. Phosphorus retentions determined using the mass balance technique ranged between 20 ± 3.9 and 94 ± 23 mg/m2/yr and were slightly lower than those calculated by multiplying sediment total phosphorus (TP) concentrations by sediment accumulation rates (49 ± 14 to 135 ± 48 mg/m2/yr). The lower TPacc values measured using the mass balance approach may result from the underestimation of external TP inputs. Alternatively, it is suggested that in the more acidic lakes, a decrease in TP concentrations in the lakewaters and/or a decrease in TP export from the catchment may have resulted in a decrease in TPacc through time. Thus, relatively higher TPacc values calculated using the sediment approach (since TPacc values calculated from the sediment data are averaged over a greater number of years than those calculated from the mass balance data). Provided several cores are collected from the lake, the direct measurement of sediment TP and sediment accumulation rates for estimating TPacc may be a suitable alternative to mass balances, especially in situations where it is not possible to measure all inputs of TP to the lake.
dc.format pdf
dc.language.iso en
dc.publisher Ontario Ministry of the Environment
dc.rights Queen's Printer for Ontario, Crown Copyright, Non-Commercial Use Permitted
dc.subject phosphorus
dc.subject retention
dc.subject sedimentation
dc.subject mass balance
dc.subject cores
dc.title A comparison of phosphorus retention in lakes determined from mass balance and sediment core calculations
dc.type Report
dc.rights.holder Queen's Printer for Ontario
dc.contributor.affiliation Ontario Ministry of the Environment, Water Resources Branch
dc.contributor.affiliation RODA Environmental Research Limited
dc.rights.license All items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.

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