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| Titel |
Organic carbon transport in Paddy soils |
| VerfasserIn |
Tino Bräuer, Pieter M. Grootes, Marie-Josée Nadeau, Nils Andersen |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250041123
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| Zusammenfassung |
| Paddy and non-paddy soils from a chronosequence of 50 to 2000 years of agricultural use,
developed on former estuarine sediments of the Yangtze River, were sampled near Cixi,
Zhejiang Province, China, in the framework of the Research Unit “Biogeochemistry of paddy
soil evolution” of the German Research Foundation (DFG). In addition samples of Yangtze
River estuarine sediments were obtained.
Results from the 50-year and the 700-year paddy and non-paddy soils reveal
increases in both total organic carbon (TOC) and TOC 14C concentration relative to the
estuarine sediment. In the non-paddy soil, a 14C gradient with 14C concentrations
decreasing with increasing depth is already established after 50 years, while in the paddy
soil little 14C increase can be seen below the plough pan. In the 700-year sites,
the 14C depth profiles are, however, quite similar. This indicates that paddy rice
cultivation quickly leads to a plough pan, which seriously reduces, but not totally
prevents, downward transport of organic matter and leads to equilibrium times
for TOC and 14C concentrations in paddy soil profiles in the order of centuries. |
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