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Low Vertical Transfer Rates of Carbon Inferred from Radiocarbon Analysis in an Amazon Podzol : Volume 10, Issue 6 (01/06/2013)

By Sierra, C. A.

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Book Id: WPLBN0004003031
Format Type: PDF Article :
File Size: Pages 10
Reproduction Date: 2015

Title: Low Vertical Transfer Rates of Carbon Inferred from Radiocarbon Analysis in an Amazon Podzol : Volume 10, Issue 6 (01/06/2013)  
Author: Sierra, C. A.
Volume: Vol. 10, Issue 6
Language: English
Subject: Science, Biogeosciences
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Quesada, C. A., Jiménez, E. M., Peñuela, M. C., Reu, B., Sierra, C. A., & Thuille, A. (2013). Low Vertical Transfer Rates of Carbon Inferred from Radiocarbon Analysis in an Amazon Podzol : Volume 10, Issue 6 (01/06/2013). Retrieved from http://www.ebooklibrary.org/


Description
Description: Max Planck Institute for Biogeochemistry, Hans-Knöll-Str. 10, 07745 Jena, Germany. Hydromorphic Podzol soils in the Amazon Basin generally support low-stature forests with some of the lowest amounts of aboveground net primary production (NPP) in the region. However, they can also exhibit large values of belowground NPP that can contribute significantly to the total annual inputs of organic matter into the soil. These hydromorphic Podzol soils also exhibit a horizon rich in organic matter at around 1–2 m depth, presumably as a result of eluviation of dissolved organic matter and sesquioxides of Fe and Al. Therefore, it is likely that these ecosystems store large quantities of carbon by (1) large amounts of C inputs to soils dominated by their high levels of fine-root production, (2) stabilization of organic matter in an illuviation horizon due to significant vertical transfers of C. To assess these ideas we studied soil carbon dynamics using radiocarbon in two adjacent Amazon forests growing on contrasting soils: a hydromorphic Podzol and a well-drained Alisol supporting a high-stature terra firme forest. Our measurements showed similar concentrations of C and radiocarbon in the litter layer and the first 5 cm of the mineral soil for both sites. This result is consistent with the idea that the hydromorphic Podzol soil has similar soil C storage and cycling rates compared to the well-drained Alisol that supports a more opulent vegetation. However, we found important differences in carbon dynamics and transfers along the vertical profile. At both soils, we found similar radiocarbon concentrations in the subsoil, but the carbon released after incubating soil samples presented radiocarbon concentrations of recent origin in the Alisol, but not in the Podzol. There were no indications of incorporation of C fixed after 1950 in the illuvial horizon of the Podzol. With the aid of a simulation model, we predicted that only a minor fraction (1.7%) of the labile carbon decomposed in the topsoil is transferred to the subsoil of the Podzol, while this proportional transfer is about 30% in the Alisol. Furthermore, our estimates were 8 times lower than previous estimations of vertical C transfers in Amazon Podzols, and question the validity of these previous estimations for all Podzols within the Amazon Basin. Our results also challenge our previous ideas about the genesis of these particular soils and suggest that either they are not true Podzols or the podzolization processes had already stopped.

Summary
Low vertical transfer rates of carbon inferred from radiocarbon analysis in an Amazon Podzol

Excerpt
Jungkunst, H. F. and Fiedler, S.: Latitudinal differentiated water table control of carbon dioxide, methane and nitrous oxide fluxes from hydromorphic soils: feedbacks to climate change, Glob. Change Biol., 13, 2668–2683, doi:10.1111/j.1365-2486.2007.01459.x, 2007.; Klinge, H.: Podzol soils in the Amazon basin, J. Soil Sci., 16, 95–103, doi:10.1111/j.1365-2389.1965.tb01423.x, 1965.; Levin, I. and Kromer, B.: The tropospheric \chem{^{14}CO_2} level in mid-latitudes of the Northern Hemisphere (1959–2003), Radiocarbon, 46, 1261–1272, 2004.; Lucas, Y., Montes, C. R., Mounier, S., Loustau Cazalet, M., Ishida, D., Achard, R., Garnier, C., Coulomb, B., and Melfi, A. J.: Biogeochemistry of an Amazonian podzol-ferralsol soil system with white kaolin, Biogeosciences, 9, 3705–3720, doi:10.5194/bg-9-3705-2012, 2012.; Malhi, Y., Doughty, C., and Galbraith, D.: The allocation of ecosystem net primary productivity in tropical forests, Philos. T. Roy. Soc. B, 366, 3225–3245, 2011.; Montes, C. R., Lucas, Y., Pereira, O. J. R., Achard, R., Grimaldi, M., and Melfi, A. J.: Deep plant-derived carbon storage in Amazonian podzols, Biogeosciences, 8, 113–120, doi:10.5194/bg-8-113-2011, 2011.; Sierra, C. A., Müller, M., and Trumbore, S. E.: Models of soil organic matter decomposition: the SoilR package, version 1.0, Geosci. Model Dev., 5, 1045–1060, doi:10.5194/gmd-5-1045-2012, 2012a.; Sierra, C. A., Trumbore, S. E., Davidson, E. A., Frey, S. D., Savage, K. E., and Hopkins, F. M.: Predicting decadal trends and transient responses of radiocarbon storage and fluxes in a temperate forest soil, Biogeosciences, 9, 3013–3028, doi:10.5194/bg-9-3013-2012, 2012b.; Quesada, C. A., Lloyd, J., Schwarz, M., Patiño, S., Baker, T. R., Czimczik, C., Fyllas, N. M., Martinelli, L., Nardoto, G. B., Schmerler, J., Santos, A. J. B., Hodnett, M. G., Herrera, R., Luizão, F. J., Arneth, A., Lloyd, G., Dezzeo, N., Hilke, I., Kuhlmann, I., Raessler, M., Brand, W. A., Geilmann, H., Moraes Filho, J. O., Carvalho, F. P., Araujo Filho, R. N., Chaves, J. E., Cruz Junior, O. F., Pimentel, T. P., and Paiva, R.: Variations in chemical and physical properties of Amazon forest soils in relation to their genesis, Biogeosciences, 7, 1515–1541, doi:10.5194/bg-7-1515-2010, 2010.; Quesada, C. A., Lloyd, J., Anderson, L. O., Fyllas, N. M., Schwarz, M., and Czimczik, C. I.: Soils of Amazonia with particular reference to the RAINFOR sites, Biogeosciences, 8, 1415–1440, doi:10.5194/bg-8-1415-2011, 2011.; Quesada, C. A., Phillips,&nb

 

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