Bertolini, T, Inglima, I, Rubino, M, Marzaioli, F, Lubritto, C, Subke, JA, Peressotti, A and Cotrufo, MF (2006) Sampling soil-derived CO2 for analysis of isotopic composition: a comparison of different techniques. Isotopes in Environmental and Health Studies, 42 (1). 57 - 65. ISSN 1025-6016

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A new system for soil respiration measurement [P. Rochette, L.B. Flanagan, E.G. Gregorich. Separating soil respiration into plant and soil components using analyses of the natural abundance of carbon-13. Soil Sci. Soc. Am. J., 63, 1207–1213 (1999).] was modified in order to collect soil-derived CO2 for stable isotope analysis. The aim of this study was to assess the suitability of this modified soil respiration system to determine the isotopic composition (δ13C) of soil CO2 efflux and to measure, at the same time, the soil CO2 efflux rate, with the further advantage of collecting only one air sample. A comparison between different methods of air collection from the soil was carried out in a laboratory experiment. Our system, as well as the other dynamic chamber approach tested, appeared to sample the soil CO2, which is enriched with respect to the soil CO2 efflux, probably because of a mass dependent fractionation during diffusion and because of the atmospheric contribution in the upper soil layer. On the contrary, the static accumulation of CO2 into the chamber headspace allows sampling of δ13C-CO2 of soil CO2 efflux.

Item Type: Article
Additional Information: The final published version can be found online at
Uncontrolled Keywords: carbon-13, carbon dioxide, measurement, respiration, sampling, soil
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Divisions: Faculty of Natural Sciences > School of Geography, Geology and the Environment
Related URLs:
Depositing User: Symplectic
Date Deposited: 15 May 2018 08:29
Last Modified: 15 May 2018 10:50

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