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| Titel |
Deep plant-derived carbon storage in Amazonian podzols |
| VerfasserIn |
C. R. Montes, Y. Lucas, O. J. R. Pereira, R. Achard, M. Grimaldi, A. J. Melfi |
| 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 ; 8, no. 1 ; Nr. 8, no. 1 (2011-01-18), S.113-120 |
| Datensatznummer |
250005348
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| Publikation (Nr.) |
 copernicus.org/bg-8-113-2011.pdf |
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| Zusammenfassung |
| Equatorial podzols are soils characterized by thick sandy horizons overlying
more clayey horizons. Organic matter produced in the topsoil is transferred
in depth through the sandy horizons and accumulate at the transition, at a
depth varying from 1 to more than 3 m, forming deep horizons rich in organic
matter (Bh horizons). Although they cover great surfaces in the equatorial
zone, these soils are still poorly known. Studying podzols from Amazonia, we
found out that the deep Bh horizons in poorly drained podzol areas have a
thickness higher than 1 m and store unexpected amounts of carbon. The average
for the studied area was 66.7 ± 5.8 kgC m−2 for the deep Bh and
86.8 ± 7.1 kgC m−2 for the whole profile. Extrapolating to the
podzol areas of the whole Amazonian basin has been possible thanks to
digital maps, giving an order of magnitude around 13.6 ± 1.1 PgC, at
least 12.3 PgC higher than previous estimates. This assessment should be
refined by additional investigations, not only in Amazonia but in all
equatorial areas where podzols have been identified. Because of the lack of
knowledge on the quality and behaviour of the podzol organic matter, the
question of the feedback between the climate and the equatorial podzol
carbon cycle is open. |
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