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| Titel |
Pyrogenic carbon loss pathways under natural and increased N deposition and its priming effect on soil organic matter |
| VerfasserIn |
B. Maestrini, S. Abiven, N. Singh, J. Bird, M. S. Torn, M. W. I. Schmidt |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250060772
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| Zusammenfassung |
| Pyrogenic carbon (PyC) plays an important role in the terrestrial C cycle, in fact it can
comprise up to 40% of soil organic carbon(1), but the relative importance of processes that
lead to its disappearance from the soil remain a mystery (2).
Most experiments on PyC mineralization have been laboratory incubations (3; 4); very
few studies have been carried out in situ (5; 6). Several studies have found relevant quantities
of PyC in marine (7) and riverine (8) dissolved organic carbon. However, since
PyC is not thought to contain easily soluble compounds (9), it is still unknown
how such large quantities of PyC can be transported from soil to water bodies.
Moreover, some studies find that PyC can promote soil organic matter decomposition
(10; 11), although other studies do not find this result (9; 4). Moreover, nitrogen
deposition might affect PyC losses from the soil, as it has been shown to reduce the
mineralization of old soil organic matter (12). We set up a field experiment to measure
PyC decomposition and stabilization in soil using stable isotopes (13C/15N) as
tracer. The experiment was conducted under ambient and added mineral nitrogen.
The equivalent of 3.8 gC kg-1 of soil of 13C- labelled (840 per mil), powdered
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