Distribution of Radiocarbon Ages in Soil Organic Matter by Thermal Fractionation
Bibliographic Data
| ID | 9243177 |
|---|---|
| Authors | Alain F Plante (0000-0003-0124-6187), Alain Plante, Steven R Beaupré (0000-0001-6964-1058), Mark L Roberts, Troy Baisden |
| Year | 2013 |
| Volume | 55 |
| Issue | 3–4 |
| Publication date | 2013-01-01 |
| Peer Reviewed | Yes |
| Open Access | No |
| Type | ARTICLE |
| Venue | Radiocarbon (JOURNAL) |
| Journal identifiers | ISSN: 0033-8222 • E-ISSN: 1945-5755 |
| Publisher | Cambridge University Press (CUP) (PUBLISHER) |
| DOI | 10.2458/azu_js_rc.55.16310 |
| OpenAlex | W2995229520 |
| Language | EN |
| Citations received | 9 |
| References cited | 21 |
Radiocarbon analysis is an important tool in quantifying soil organic matter (SOM) dynamics within the terrestrial carbon cycle. However, there is increasing appreciation that representing SOM as a single, homogeneous pool with a single, mean 14 C concentration is inadequate. We investigate whether the differing patterns in CO 2 release during ramped-temperature oxidation reflect organic matter of different ages, and hypothesize that thermally labile SOM (combusting at low temperatures) consists of younger carbon than thermally resistant organic matter. Topsoil samples under contrasting land uses (native vegetation and long-term cultivation) were selected for 14 C analysis before and after acid fumigation for the removal of carbonates. Results of bulk 14 C analyses showed a significant shift in 14 C age from 0.944 Fm under native vegetation to 0.790 Fm under cultivation. Four to 5 “fractions” associated with different CO 2 -evolution regions were identified by thermal analysis and analyzed for 14 C via modifications to NOSAMS' established “programmed temperature pyrolysis system,” in which discrete CO 2 fractions evolved during ramped-temperature oxidation were isotopically characterized by a microwave gas ion source (GIS) continuous-flow AMS (CFAMS) system. Results showed that while acid fumigation removed soil carbonates, the treatment also significantly altered the thermograms and inferred SOM composition. While direct attribution of 14 C values to individual peaks is somewhat confounded by overlapping temperature ranges for oxidation of unique populations of carbon, in general, thermally stable fractions of SOM appear to be 14 C-depleted compared to thermally reactive (low temperature) fractions regardless of pretreatment
Carbon fibers · Dissolved organic carbon · Fractionation · Fumigation · Organic matter · Pyrolysis · Radiocarbon dating · Soil organic matter · Soil water · Topsoil · Total organic carbon · Archaeology and ancient environmental studies · Chemistry · Environmental Science · Geochemistry and Geologic Mapping · Geology and Paleoclimatology Research · Isotope Analysis in Ecology · Materials Science · Ecology · Environmental Chemistry · Geology · Organic Chemistry · Paleontology · Soil Science
Carbonate removal from radiocarbon samples using a “no leach” acid pretreatment to retain mobile organic carbon
Ramped oxidation and fine scale serial 14 C analyses of saltmarsh soils
Processing of samples by ramped oxidation at the Neif Radiocarbon Laboratory, Suerc
Assessing the Blank Carbon Contribution, Isotope Mass Balance, and Kinetic Isotope Fractionation of the Ramped Pyrolysis/Oxidation Instrument at Nosams
Influence of Different Acid Treatments on the Radiocarbon Content Spectrum of Sedimentary Organic Matter Determined by RPO/Accelerator Mass Spectrometry
A New Ramped Oxidation- 14 C Analysis Facility at the Neif Radiocarbon Laboratory, East Kilbride, Uk
Bag of Tricks
Advancing Antarctic Sediment Chronology Through Combined Ramped Pyrolysis Oxidation and Pyrolysis-Gc-MS
Sequential Thermal Analysis of Complex Organic Mixtures
| Unique citing works | 9 |
|---|---|
| Citations per year | 1 |
| Citation span | 2017 - 2026 (10) |
| Citation velocity | current |
| Highly cited | No |
| Citation types | Neutral: 7 |