Monitoring organic matter dynamics in soil profiles by ‘Rock-Eval pyrolysis’: bulk characterization and quantification of degradation
| Autor: | Jean-Robert Disnar, C. Di Giovanni, Eric P. Verrecchia, Bernard Guillet, David Sebag, Alain Durand |
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| Rok vydání: | 2005 |
| Předmět: |
chemistry.chemical_classification
Peat 010504 meteorology & atmospheric sciences Soil organic matter Soil Science Mineralogy Fraction (chemistry) Soil classification 15. Life on land 010502 geochemistry & geophysics 01 natural sciences chemistry Environmental chemistry Degradation (geology) Organic matter Sedimentary rock Pyrolysis 0105 earth and related environmental sciences |
| Zdroj: | European Journal of Soil Science. 57:344-355 |
| ISSN: | 1351-0754 |
| Popis: | Summary Rock-Eval pyrolysis was designed for petroleum exploration to determine the type and quality of organic matter in rock samples. Nevertheless, this technique can be used for bulk characterization of the immature organic matter in soil samples and recent sediments. We studied 76 samples from seven soil classes and showed that their pyrograms can be described by a combination of four elementary Gaussian components: F1, F2, F3 and F4. These four components are related to major classes of organic constituents differing in origin and their resistance to pyrolysis: labile biological constituents (F1), resistant biological constituents (F2), immature non-biotic constituents (F3) and a mature refractory fraction (F4). We discriminated the relative contributions of these components and used them to derive two indices: (i) to quantify the relative contributions of labile and resistant biological constituents and (ii) to quantify the degradation stage of the soil organic matter. The practical applications are illustrated via the influence of vegetal cover on soil organic matter dynamics and peat development in a Holocene sedimentary sequence, but we suggest that the approach is of much wider application. |
| Databáze: | OpenAIRE |
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