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Sampling soil-derived CO2 for analysis of isotopiccomposition: a comparison of different techniques

Publikation: Bidrag til tidsskriftTidsskriftartikel

Dokumenter

  • Teresa Bertolini
  • Mauro Rubino

Anewsystem 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

, , 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 (d13C) 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 d13C-CO2

of soil CO2 efflux.

OriginalsprogEngelsk
TidsskriftIsotopes in Environmental and Health Studies
Vol/bind42
Udgave nummer1
ISSN1025-6016
DOI
StatusUdgivet - 2006
Eksternt udgivetJa

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