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| Titel |
Mineral fertilization did not affect decay of old lignin and SOC in a 13C-labeled arable soil over 36 years |
| VerfasserIn |
Anett Hofmann, Alexander Heim, P. Gioacchini, A. Miltner, M. Gehre, M. W. I. Schmidt |
| 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 ; 6, no. 7 ; Nr. 6, no. 7 (2009-07-07), S.1139-1148 |
| Datensatznummer |
250003905
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| Publikation (Nr.) |
 copernicus.org/bg-6-1139-2009.pdf |
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| Zusammenfassung |
| Retardation of soil organic carbon (SOC) decay after nitrogen addition to
litter or soil has been suggested in several recent studies and has been
attributed to a retardation in lignin decay. With our study we tested the
long-term effect of mineral fertilization (N+P) on the decay of the SOC
component lignin in arable soil. To achieve this, we tracked
13C-labeled lignin and SOC in an arable soil that is part of a 36-year
field experiment (conversion from C3 to C4 crops) with two mineral
fertilization levels. We could show that fertilization neither retarded nor
enhanced the decay of old SOC or lignin over a period of 36 years, proposing
that decay of lignin was less sensitive to fertilization than previously
suggested. However, for new, C4-derived lignin there were indications
that decay might have been enhanced by the fertilization treatment, whereas
decay of new SOC was unaffected. |
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