Contribution of sedimentary resuspension to non-conservative fluxes of dissolved inorganic phosphorus in San Quintin Bay, Baja California: An experimental estimate

Contribution of sedimentary resuspension to non-conservative fluxes of dissolved inorganic phosphorus in San Quintin Bay, Baja California: An experimental estimate

 Abiotic processes like sedimentary resuspension may contribute to non-conservative fluxes of dissolved inorganic phosphorus (DIP) in shallow systems like San Quintín Bay (SQB), because suspended particles may adsorb or desorb inorganic phosphate. The contribution of suspended sediments to...

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Huvudupphovsmän: Ortiz-Hernández, MC, Camacho-Ibar, VF, Carriquiry, JD, Ibarra-Obando, SE, Daessle, LW
Materialtyp: Online
Språk:eng
Publicerad: Iniversidad Autónoma de Baja California 2004
Länkar:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/119
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spelling oai:cienciasmarinas.com.mx:article-1192019-04-22T22:02:44Z Contribution of sedimentary resuspension to non-conservative fluxes of dissolved inorganic phosphorus in San Quintin Bay, Baja California: An experimental estimate Contribución de la resuspensión de sedimentos a los flujos no conservativos de fósforo inorgánico disuelto en Bahía San Quintín, Baja California: Una estimación experimental Ortiz-Hernández, MC Camacho-Ibar, VF Carriquiry, JD Ibarra-Obando, SE Daessle, LW DIP adsorption-desorption LOICZ adsorption isotherm San Quintín Bay PID adsorción-desadsorción LOICZ isoterma de adsorción Bahía San Quintín  Abiotic processes like sedimentary resuspension may contribute to non-conservative fluxes of dissolved inorganic phosphorus (DIP) in shallow systems like San Quintín Bay (SQB), because suspended particles may adsorb or desorb inorganic phosphate. The contribution of suspended sediments to DIP concentrations in SQB was determined in the laboratory through adsorption-desorption experiments with two types of sediments (fine sand and sandy silt), and different concentrations of suspended particles, the initial concentration of DIP and resuspension time. The zero equilibrium phosphate concentration (EPC0) was observed during the first step of the adsorption process (fast step), which occurred before 10 h. The EPC0 was exceeded after 24 h of resuspension, indicating the diffusion of P from the surface toward the interior of particles (slow step). Adsorption was the dominant process in the experiments, and the intensity of adsorption-desorption was emphasized with an increase in the amount of resuspended particles. From the comparison of the non-conservative fluxes of DIP estimated using the LOICZ model with those estimated with resuspension experiments, we conclude that adsorption may lead to an underestimation of ~20% of net heterotrophy in SQB calculated with the LOICZ model, as excess respiration leads to a net release of DIP to the water column, but adsorption by particles masks this net release. Procesos abióticos como la resuspensión sedimentaria pueden contribuir a los flujos no conservativos del fósforo inorgánico disuelto (PID) en sistemas someros como Bahía San Quintín (BSQ), ya que los sedimentos resuspendidos pueden adsorber o desadsorber fósforo inorgánico. Se determinó en el laboratorio, mediante experimentos de adsorción-desadsorción, la contribución de los sedimentos en suspensión a las concentraciones del PID observadas en la columna de agua de BSQ variando el tipo de sedimento (arena fina y limo arenoso) en suspensión y su concentración, la concentración inicial de PID y el tiempo de resuspensión. En la primera etapa del proceso de adsorción (etapa rápida), ocurrida antes de las 10 h, se observó la concentración de fósforo en equilibrio (EPC0, por sus siglas en inglés). En sedimentos expuestos a > 24 h de resuspensión, la EPC0 fue rebasada, indicando la movilización del P de la superficie hacia el interior de las partículas (etapa lenta). La adsorción fue el proceso dominante en los experimentos y, al aumentar la cantidad de sedimento resuspendido, los procesos de adsorción-desadsorción se acentuaron. Al comparar los flujos no conservativos de PID obtenidos con el modelo de LOICZ y los obtenidos en los experimentos de resuspensión, se observa que la adsorción del PID por las partículas puede generar una subestimación de ~20% de la heterotrofía neta del sistema, ya que la remoción de PID por adsorción enmascara su adición por la respiración neta de la comunidad. Iniversidad Autónoma de Baja California 2004-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/119 10.7773/cm.v30i11.119 Ciencias Marinas; Vol. 30 No. 1A (2004); 75-88 Ciencias Marinas; Vol. 30 Núm. 1A (2004); 75-88 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/119/98
institution Ciencias Marinas
collection OJS
language eng
format Online
author Ortiz-Hernández, MC
Camacho-Ibar, VF
Carriquiry, JD
Ibarra-Obando, SE
Daessle, LW
spellingShingle Ortiz-Hernández, MC
Camacho-Ibar, VF
Carriquiry, JD
Ibarra-Obando, SE
Daessle, LW
Contribution of sedimentary resuspension to non-conservative fluxes of dissolved inorganic phosphorus in San Quintin Bay, Baja California: An experimental estimate
author_facet Ortiz-Hernández, MC
Camacho-Ibar, VF
Carriquiry, JD
Ibarra-Obando, SE
Daessle, LW
author_sort Ortiz-Hernández, MC
title Contribution of sedimentary resuspension to non-conservative fluxes of dissolved inorganic phosphorus in San Quintin Bay, Baja California: An experimental estimate
title_short Contribution of sedimentary resuspension to non-conservative fluxes of dissolved inorganic phosphorus in San Quintin Bay, Baja California: An experimental estimate
title_full Contribution of sedimentary resuspension to non-conservative fluxes of dissolved inorganic phosphorus in San Quintin Bay, Baja California: An experimental estimate
title_fullStr Contribution of sedimentary resuspension to non-conservative fluxes of dissolved inorganic phosphorus in San Quintin Bay, Baja California: An experimental estimate
title_full_unstemmed Contribution of sedimentary resuspension to non-conservative fluxes of dissolved inorganic phosphorus in San Quintin Bay, Baja California: An experimental estimate
title_sort contribution of sedimentary resuspension to non-conservative fluxes of dissolved inorganic phosphorus in san quintin bay, baja california: an experimental estimate
description  Abiotic processes like sedimentary resuspension may contribute to non-conservative fluxes of dissolved inorganic phosphorus (DIP) in shallow systems like San Quintín Bay (SQB), because suspended particles may adsorb or desorb inorganic phosphate. The contribution of suspended sediments to DIP concentrations in SQB was determined in the laboratory through adsorption-desorption experiments with two types of sediments (fine sand and sandy silt), and different concentrations of suspended particles, the initial concentration of DIP and resuspension time. The zero equilibrium phosphate concentration (EPC0) was observed during the first step of the adsorption process (fast step), which occurred before 10 h. The EPC0 was exceeded after 24 h of resuspension, indicating the diffusion of P from the surface toward the interior of particles (slow step). Adsorption was the dominant process in the experiments, and the intensity of adsorption-desorption was emphasized with an increase in the amount of resuspended particles. From the comparison of the non-conservative fluxes of DIP estimated using the LOICZ model with those estimated with resuspension experiments, we conclude that adsorption may lead to an underestimation of ~20% of net heterotrophy in SQB calculated with the LOICZ model, as excess respiration leads to a net release of DIP to the water column, but adsorption by particles masks this net release.
publisher Iniversidad Autónoma de Baja California
publishDate 2004
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/119
_version_ 1715723924007813120

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