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| Titel |
Dynamics of soil organic matter pools after agricultural abandonment |
| VerfasserIn |
Agata Novara, Luciano Gristina, Juliane Rühl, Tommaso La Mantia, Luigi Badalucco, Yakov Kuzyakov, Vito Armando Laudicina |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250086983
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| Publikation (Nr.) |
 EGU/EGU2014-937.pdf |
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| Zusammenfassung |
| Dynamics of soil organic matter pools after agricultural abandonment
Agata Novara (1), Tommaso La Mantia (1), Juliane Rühl(1), Luigi Badalucco (1), Yakov
Kuzyakov (2), Luciano Gristina (1) Vito Armando Laudicina *(1)
Dipartimento di Scienze Agrarie e Forestali, University of Palermo, Viale delle
Scienze, Edificio 4, Italy
Soil Science of Temperate Ecosystems, Georg-August-University of Gottingen,
Gottingen, 37077, Germany
Abstract
Changes of land use from croplands to natural vegetation usually increase Carbon (C)
stocks in soil. However, the contribution of old and new C to various pools still is not clearly
analyzed. We measured the δ13C signature of soil organic carbon (SOC) pools after
vegetation change from vineyard (C3) to grassland (C4) under Mediterranean climate to
assess the changes of old and new C in total SOC, microbial biomass (MB), dissolved organic
C (DOC), and CO2 efflux from soil.
Development of the perennial grass Hyparrhenia hirta (C4) on vineyard abandoned for
15 or 35 years ago increased C stocks for 13% and 16%, respectively (in the upper 15 cm).
This increase was linked to the incorporation of new C in SOC and with exchange of 25% of
old C by new C after 35 years. The maximal incorporation of new C was observed in MB,
thus reflecting the maximal turnover and availability of this pool. The DOC was produced
mainly from old C of soil organic matter (SOM), showing that under Mediterranean climate
DOC will be mainly produced not from fresh litter but from old SOM sources.
Decomposition of SOM during a 51 days laboratory incubation was higher in cultivated
vineyard than H. hirta soils. Based on changes in δ13C values of SOM, MB, DOC
and CO2 in C3 soil and in soils after 15 and 35 years of C4 plant colonization, we
separated 13C fractionation in soil from changes of isotopic composition by preferential
utilization of substrates with different availability. The utilization pattern in this
soil under Mediterranean climate was different from that in temperate ecosystems. |
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