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A passive sampling method for radiocarbon analysis of soil respiration using molecular sieve |
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| Authors: | Mark H Garnett Iain P Hartley Martin Sommerkorn |
| Institution: | a NERC Radiocarbon Facility (Environment), Rankine Avenue, East Kilbride, Glasgow G75 0QF, UK b School of Biological and Environmental Sciences, University of Stirling, Stirling FK9 4LA, UK c Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, UK d Macaulay Institute, Macaulay Drive, Craigiebuckler, Aberdeen AB15 8QH, UK |
| Abstract: | Radiocarbon analysis of soil CO2 can provide information on the age, source and turnover rate of soil organic C. We developed a new method for passively trapping respired CO2 on molecular sieve, allowing it to be returned to the laboratory and recovered for C isotope analysis. We tested the method on a soil at a grassland site, and using a synthetic soil created to provide a contrasting isotopic signature. As with other passive sampling techniques, a small amount of fractionation of the 13C isotope occurs during sampling, which we have quantified, otherwise the results show that the molecular sieve traps a sufficiently large and representative sample of CO2 for C isotope analysis. Since 14C results are routinely corrected for mass-dependent fractionation, our results show that passive sampling of soil respiration using molecular sieve offers a reliable method to collect soil-respired CO2 for 14C analysis. |
| Keywords: | Soil respiration CO2 Radiocarbon Molecular sieve |
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