Sedimentary evidence of soil organic matter input to the Curuai Amazonian floodplain |
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| Institution: | 1. Universidade do Estado do Rio de Janeiro, UERJ, Faculdade de Geologia, Av. São Francisco Xavier, 24, sala 2020A, Maracanã, 20550-013 Rio de Janeiro, RJ, Brazil;2. Universidade de Aveiro, GeoBioTec, Departamento de Geociências, Campus de Santiago, 3810-193 Aveiro, Portugal;3. Universidade do Estado do Rio de Janeiro, UERJ, Faculdade de Oceanografia, Rua São Francisco Xavier, 524, 4° andar, Bloco E, sala 4018, CEP 20550-900 Rio de Janeiro, RJ, Brazil;4. Instituto Oceanográfico, Universidade de São Paulo (IOUSP), Pça. Do Oceanográfico, 191, Butantã, São Paulo, Brazil;5. Laboratório de Micropaleontologia – LabMicro, Universidade Federal do Estado do Rio de Janeiro (UNIRIO), Av. Pasteur, 436, Urca, CEP 22290-240 Rio de Janeiro, Brazil;6. Department of Pure and Applied Sciences, Università degli Studi di Urbino “Carlo Bo”, 61029 Urbino, Italy;7. Universidade Federal Fluminense, Instituto de Biologia, Departamento de Biologia Marinha, Laboratorio de Paleoecologia e Mudanças Globais Campus de Gragoatá, Bloco M, CEP: 24210-200 Niterói, Rio de Janeiro, Brazil;8. Institut National des Sciences et Technologies de la Mer, Department of Marine Science, Tunis, Tunisia;9. Department of Chemical Oceanography, School of Marine Sciences, Cochin University of Science and Technology, Cochin 682016, Kerala, India |
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| Abstract: | A multi-proxy study has been performed on a sediment core from the Curuai floodplain, Central Amazonia. The combination of elemental, isotopic and molecular analysis of a 110 cm core (a record of ca. the last 100 yr) allowed reconstruction of the hydrological conditions of organic matter (OM) deposition. Two units could be delineated. The first (UI) was composed of three sub-units: UIa (0–15 cm), composed of highly degraded organic particles originating from the surrounding soil and indicative of restricted transport; UIb (15–48 cm), during which the region was permanently flooded and the material stored came from soil runoff, mainly from alluvial forest; and UIc (48–88 cm) composed of material from Amazon River suspended sediment, itself originating from OM degradation in forest soil. In UII (88–111 cm), the OM originated mainly from the forest soil and other plant remains in the floodplain. The data reveal that, during the four distinct depositional periods, the sedimentary OM alternated between land derived soil and alluvial vegetation due to changes in hydrodynamics. |
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