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Timescale of reduction of long-term phosphorus release from sediment in lakes

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dc.contributor.author Rippey, Brian
dc.contributor.author Campbell, Julie
dc.contributor.author McElarney, Yvonne
dc.contributor.author Thompson, James
dc.contributor.author Gallagher, Mary
dc.date.accessioned 2021-09-28T14:34:38Z
dc.date.available 2021-09-28T14:34:38Z
dc.date.issued 2021-05-25
dc.identifier http://hdl.handle.net/20.500.12518/355
dc.identifier.citation Rippey, B., Campbell, J., McElarney, Y., Thompson, J. and Gallagher, M. (2021) ‘Timescale of reduction of long-term phosphorus release from sediment in lakes’, Water Research, 200, p. 117283. doi: 10.1016/j.watres.2021.117283. en_US
dc.identifier.issn 0043-1354
dc.identifier.uri https://doi.org/10.1016/j.watres.2021.117283
dc.description Publication history: Accepted - 19 May 2021; Published online - 25 May 2021. en_US
dc.description.abstract It is important for lake management and policy to estimate the timescale of recovery from long-term P release from sediment after a reduction in the external load. To provide a scientific basis for this, a condensed model was elaborated, applied and evaluated in four lakes. The model is based on first order kinetics, with an overall rate constant composed of the rate of diagenesis of labile P (kd,2) and rate of burial of P (kb) below an active sediment layer. Using the variation of P fractions in dated sediment cores, kd,2 varied from 0.0155 to 0.383 yr−1, kb from 0.0184 to 0.073 yr−1 and the overall rate constant from 0.0230 to 0.446 yr−1. The active layer depths, 8 to 29 cm, and kd,2 values are within the ranges found by others. The time for a 75% reduction (t75) of labile P in the active layer is 60 years in Lough Melvin, 3 in Ramor, 33 in Sheelin and 41 in Neagh, although P release is only important in Ramor and Neagh. Combining the kd,2 values with other estimates (mean 0.0981 yr−1, median 0.0426; n=14) produces a t75 value of less than 14 and 33 years. A review of other models indicates a timescale of one to two decades and from lake monitoring also of one to two decades. It is desirable to estimate the timescale directly in all lakes if sediment P release is important, but, generally, it should take between one and three decades. en_US
dc.description.sponsorship Environmental Protection Agency of Ireland; Department for Agriculture, Environment and Rural Affairs in Northern Ireland en_US
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.rights Copyright 2021 Elsevier. This manuscript is distributed under a Creative Commons Attribution-NonCommercial-NoDerivs License (https://creativecommons.org/licenses/by-nc-nd/4.0/), which permits distribution and reproduction for non-commercial purposes, provided the author and source are cited. en_US
dc.subject Recovery en_US
dc.subject Model en_US
dc.subject Diagenesis en_US
dc.subject Burial en_US
dc.title Timescale of reduction of long-term phosphorus release from sediment in lakes en_US
dc.type Article en_US

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