Spatial and seasonal contrasts of sedimentary organic matter in floodplain lakes of the central Amazon basin

Other literature type, Article OPEN
Sobrinho, R. L. ; Bernardes, M. C. ; Abril, G. ; Kim, J. H. ; Zell, C. I. ; Mortillaro, J. M. ; Meziane, T. ; Moreira Turcq, Patricia ; Damste, J. S. S. (2016)
  • Publisher: Copernicus Publications
  • Journal: (issn: 1726-4170, eissn: 1726-4189)
  • Related identifiers: doi: 10.5194/bgd-12-8747-2015, doi: 10.5194/bg-13-467-2016
  • Subject: Ecology | http://aims.fao.org/aos/agrovoc/c_32372 | M40 - Ecologie aquatique | QH540-549.5 | QE1-996.5 | P33 - Chimie et physique du sol | QH501-531 | Geology | Life

In this study, we investigated the seasonal and spatial pattern of sedimentary organic matter (SOM) in five floodplain lakes of the central Amazon basin (Cabaliana, Janauaca, Canaçari, Mirituba and Curuai) which have different morphologies, hydrodynamics and vegetation coverages. Surface sediments were collected in four hydrological seasons: low water (LW), rising water (RW), high water (HW) and falling water (FW) in 2009 and 2010. We investigated commonly used bulk geochemical tracers such as the C : N ratio and the stable isotopic composition of organic carbon (<i>&delta;</i><sup>13</sup>C<sub>org</sub>). These results were compared with lignin phenol parameters as an indicator of vascular plant detritus and branched glycerol dialkyl glycerol tetraethers (brGDGTs) to trace the input of soil organic matter (OM) from land to the aquatic settings. We also applied the crenarchaeol as an indicator of aquatic (rivers and lakes) OM. Our data showed that during the RW and FW seasons, the surface sediments were enriched in lignin and brGDGTs in comparison to other seasons. Our study also indicated that floodplain lake sediments primarily consisted of allochthonous, C<sub>3</sub> plant-derived OM. However, a downstream increase in C<sub>4</sub> macrophyte-derived OM contribution was observed along the gradient of increasing open waters &ndash; i.e., from upstream to downstream. Accordingly, we attribute the temporal and spatial difference in SOM composition to the hydrological dynamics between the floodplain lakes and the surrounding flooded forests.
  • References (66)
    66 references, page 1 of 7

    Abril, G., Martinez, J.-M., Artigas, L. F., Moreira-Turcq, P., Benedetti, M. F., Vidal, L., Meziane, T., Kim, J.-H., Bernardes, M. C., Savoye, N., Deborde, J., Souza, E. L., Alberic, P., Landim de Souza, M. F., and Roland, F. Amazon River carbon dioxide outgassing fueled by wetlands, Nature, 505, 395-398, 2014.

    Aufdenkampe, A. K., Mayorga, E., Hedges, J. I., Llerena, C., Quay, P. D., Gudeman, J., Krusche, A. V., and Richey, J.E. Organic matter in the Peruvian headwaters of the Amazon: Compositional evolution from the Andes to the lowland Amazon mainstem, Org. Geochem., 38, 337-364, 2007.

    Battin, T. J., Luyssaert, S., Kaplan, L. A., Aufdenkampe, A. K., Richter, A., and Tranvik, L. J. The boundless carbon cycle, Nat. Geosci., 2, 598-600, 2009.

    Belicka, L. L. and Harvey, H. R. The sequestration of terrestrial organic carbon in Arctic Ocean sediments: A comparison of methods and implications for regional carbon budgets, Geochim. Cosmochim. Ac., 73, 6231-6248, 2009.

    Bernardes, M. C., Martinelli, L. A., Krusche, A. V., Gudeman, J., Moreira, M., Victoria, R. L., Ometto, J. P. H. B., Ballester, M. V. R., Aufdenkampe, A. K., Richey, J. E., and Hedges, J. I.: Riverine organic matter composition as a function of land use changes, Southwest Amazon, Ecol. Appl., 14, 263-279, 2004.

    Blaga, C. I., Reichart, G. J., Vissers, E. W., Lotter, A. F., Anselmetti, F. S., and Sinninghe Damsté, J. S.: Seasonal changes in glycerol dialkyl glycerol tetraether concentrations and fluxes in a perialpine lake: implications for the use of the TEX86 and BIT proxies, Geochim. Cosmochim. Ac., 75, 6416-6428, 2011.

    Bligh, E. G. and Dyer, W. J.: A Rapid Method of Total Lipid Extraction and Purification, Can. J. Biochem. Phys., 37, 911-917, 1959.

    Bonnet, M. P., Barroux, G., Martinez, J. M., Syeler, F., MoreiraTurcq, P., Cochonneau, G., Melack, J. M., Boaventura, G., Maurice-Bougoin, L., León, J. G, Roux, E., Calmant, S., Kosuth, P., Guyot, J. L., and Seyler, P.: Floodplain hydrology in an Amazon floodplain lake (lago Grande de Curuai), J. Hydrol., 349, 18- 30, 2008.

    Bourgoin, L. M., Bonnet, M. P., Martinez, J. M., Kosuth, P., Cochonneau, G., Moreira-Turcq, P., Guyot, J. L., Vauchel, P., Filizola, N., and Seyler, P.: Temporal dynamics of water and sediment exchanges between the Curuai floodplain and the Amazon River, Brazil, J. Hydrol., 335, 140-156, 2007.

    Bray, E. E. and Evans, E. D.: Distribution of n-paraffins as a clue to recognition of source beds, Geochim. Cosmochim. Ac., 22, 2-15, 1961.

  • Similar Research Results (1)
  • Metrics
    No metrics available
Share - Bookmark