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Redox control on carbon mineralization and dissolved organic matter along a chronosequence of paddy soils

Title data

Hanke, Alexander ; Cerli, Chiara ; Muhr, Jan ; Borken, Werner ; Kalbitz, Karsten:
Redox control on carbon mineralization and dissolved organic matter along a chronosequence of paddy soils.
In: European Journal of Soil Science. Vol. 64 (2013) Issue 4 . - pp. 476-487.
ISSN 1351-0754
DOI: https://doi.org/10.1111/ejss.12042

Abstract in another language

Paddy soils are subjected to periodically changing redox conditions. In order to understand better the redox control on long-term carbon turnover, we assessed carbon mineralization and dissolved organic carbon (DOC) of paddy topsoils sampled along a chronosequence spanning 2000 years of rice cultivation. Non-paddy soils were used as references. We exposed soils to alternating redox conditions for 12 weeks in incubation experiments. Carbon mineralization of paddy soils was independent of redox conditions. Anoxic conditions caused increasing DOC concentrations for paddy soils, probably because of desorption induced by increasingpH. We assume desorption released older, previously stabilized carbon, which then was respired by a microbial community well adapted to anoxic conditions. This assumption is supported by the 14C signatures of respired CO2, indicating larger mineralization of older carbon under anoxic than under oxic conditions. The increasing DOC concentrations under anoxic conditions did not result in an equivalent increase in carbon mineralization, possibly because of little reducible iron oxide. Therefore, net DOC and CO2 production were not positively related under anoxic conditions. The overall 20–75% smaller carbon mineralization of paddy soils than of non-paddy soils resulted from less respiration under oxic conditions. We conclude that carbon accumulation in paddy as well as in other wetland soils results from a microbial community well adapted to anoxic conditions,but less efficient in mineralizing carbon during transient oxic periods. Carbon accumulation might be even larger when mineralization under anoxic conditions is restricted by a lack of alternative electron acceptors.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER103747
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 07 Aug 2015 06:59
Last Modified: 07 Aug 2015 06:59
URI: https://eref.uni-bayreuth.de/id/eprint/17649