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Published (Version of record)CC BY V4.0, Open Access
Published (Version of record)CC BY V4.0, Open
Journal article
Organic Matter Redox State Driven by Specific Sources in Mangrove Sediments: A Case Study from Peruvian Ecosystems
Journal of Marine Science and Engineering, Vol.9(12), pp.1-8
15/12/2021
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Abstract
In order to determine the organic matter redox state in relation to specific sources in mangrove sediments, two 60 cm-long sediment cores were collected from mangrove-covered and mudflat zones within a mangrove forest in Peru. Sediment subsamples from these cores were analyzed to determine δ13C values and C:N ratios, whereas two redox indices, namely, electrochemical (fEAOM) and spectroscopical (A1650/A3400) indices, were taken from a previous study and correlated with the geochemical indices obtained from this work. These indices may provide accurate information on sedimentary organic matter diagenesis by oxidative processes through its redox state. The results show that the electrochemical index (fEAOM) and the spectroscopical index (A1650/A3400) for mangrove-covered sediments exhibited a positive correlation with δ13C values and a negative correlation with C:N molar ratios. These correlations suggest that the more labile sedimentary organic matter derived from non-terrestrial sources is in a more oxidized state than that derived from mangrove vegetation. However, this was not valid for mudflat zones, where non-significant correlations between geochemical indices were observed. Furthermore, the results suggest that the redox state of the organic matter deposited over time is dependent on source mixing influences, being better preserved in the presence of mangrove-derived organic matter.
Details
- Title
- Organic Matter Redox State Driven by Specific Sources in Mangrove Sediments: A Case Study from Peruvian Ecosystems
- Creators
- Alexander Pérez - Universidad Peruana Cayetano HerediaGerardo Cebrián-Torrejón - Université des Antilles et de la GuyaneNoemí Montoya - Universitat de ValènciaJoan Piquero-Cilla - Universitat de ValènciaChristian J Sanders - Southern Cross UniversityAntonio Doménech-Carbó - Universitat de ValènciaWilson Machado - Universidade Federal Fluminense
- Publication Details
- Journal of Marine Science and Engineering, Vol.9(12), pp.1-8
- Publisher
- MDPI AG
- Identifiers
- 991012988296302368
- Copyright
- © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
- Academic Unit
- Faculty of Science and Engineering; School of Environment, Science and Engineering; National Marine Science Centre; Science
- Language
- English
- Resource Type
- Journal article