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...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2004 |
| País: | México |
| Institución: | Universidad Autónoma de Baja California Sur |
| Repositorio: | Repositorio Institucional de la UABCS |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorioinstitucional.uabc.mx:20.500.12930/7351 |
| Acceso en línea: | https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/119 |
| Access Level: | acceso abierto |
| Palabra clave: | DIP adsorption-desorption LOICZ adsorption isotherm San Quintín Bay PID adsorción-desadsorción isoterma de adsorción Bahía San Quintín |
| Sumario: | 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. |
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