John Wiley & Sons, Ltd.

Internal phosphorus load in a mexican reservoir: Forecast and validation

To determine the internal phosphorus load (IPL) as a function of redox potential (Eh) in a Mexican reservoir, we extrapolate the results from a phosphorus (P) release experiment to temporal and spatial variations of Eh in sediments, obtaining an IPL‐Eh of 24.2 ± 2.5 t/yr. This result is compared to the P mass balance (MB) in the reservoir, where the IPL‐MB is determined as the difference between P inputs to the reservoir and the outputs. Inputs of P are the sum of the external P load from the hydrological basin, the IPL, and P in atmospheric precipitation; outputs of P are the sum of sedimented P, and the removal of P in water and biomass, and the resulting IPL‐MB, is 26.4 ± 4.9 t/yr. Additionally P concentrations in sediment cores (SC) are analyzed, and the historical release of P from sediments determined, resulting in an IPL‐SC of 23.5 ± 1.4 t/yr. It is observed that the different results of IPL are similar, since average values are within the standard deviation of IPL‐MB. It is concluded that the analysis of the variations in Eh in sediments allows determination of the reservoir's IPL. Six‐weekly IPL‐Eh and IPL‐MB are analyzed and it is observed that IPL occurs mainly during the period from May to August, when the water column is thermally stratified. This article is protected by copyright. All rights reserved

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