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| Titel |
Australian net (1950s–1990) soil organic carbon erosion: implications for CO2 emission and land–atmosphere modelling |
| VerfasserIn |
A. Chappell, N. P. Webb, R. A. Viscarra Rossel, E. Bui |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 18 ; Nr. 11, no. 18 (2014-09-29), S.5235-5244 |
| Datensatznummer |
250117614
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| Publikation (Nr.) |
 copernicus.org/bg-11-5235-2014.pdf |
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| Zusammenfassung |
| The debate remains unresolved about soil erosion substantially offsetting fossil fuel emissions
and acting as an important source or sink of CO2.
There is little historical land use and management context to this debate,
which is central to Australia's recent past of European settlement,
agricultural expansion and agriculturally-induced soil erosion. We use
"catchment" scale (∼25 km2) estimates of 137Cs-derived
net (1950s–1990) soil redistribution of all processes (wind, water and
tillage) to calculate the net soil organic carbon (SOC) redistribution across
Australia. We approximate the selective removal of SOC at net eroding
locations and SOC enrichment of transported sediment and net depositional
locations. We map net (1950s–1990) SOC redistribution across Australia and
estimate erosion by all processes to be ∼4 Tg SOC yr−1, which
represents a loss of ∼2% of the total carbon stock (0–10 cm) of
Australia. Assuming this net SOC loss is mineralised, the flux
(∼15 Tg CO2-equivalents yr−1) represents an omitted 12% of
CO2-equivalent emissions from all carbon pools in Australia. Although a small
source of uncertainty in the Australian carbon budget, the mass flux
interacts with energy and water fluxes, and its omission from land surface
models likely creates more uncertainty than has been previously recognised. |
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