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Effects of experimental drying intensity and duration on respiration and methane production recovery in fen peat incubations

Title data

Estop Aragonés, Cristian ; Blodau, Christian:
Effects of experimental drying intensity and duration on respiration and methane production recovery in fen peat incubations.
In: Soil Biology & Biochemistry. Vol. 47 (2012) . - pp. 1-9.
ISSN 0038-0717
DOI: https://doi.org/10.1016/j.soilbio.2011.12.008

Abstract in another language

Drying and rewetting to a variable extent influence the C gas exchange between peat soils and theatmosphere.We incubated a decomposed and compacted fen peat and investigated in two experiments 1) the vertical distribution of CO2 and CH4 production rates and their response to drying and 2) the effects of temperature, drying intensity and duration on CO2 production rates and on CH4 production recovery afterrewetting. Surface peat down to 5 cm contributed up to 67% (CO2) and above 80% (CH4) of the depthaggregated (50 cm) production. As CO2 production sharply decreased with depth water table fluctuations in deeper peat layers are thus not expected to cause a substantial increase in soil respiration in this site. Compared to anaerobic water saturated conditions drying increased peat CO2 production by a factor between 1.4 and 2.1. Regarding the effects of the studied factors, warmer conditions increased and prolonged drying duration decreased CO2 production whereas the soil moisture level had little influence. No significant interactions among factors were found. Short dry events under warmer conditions are likely to result in greatest peaks of CO2 production rates. Upon rewetting, CH4 productionwas monitored over time and the recovery was standardized to pre-drying levels to compare the treatment effects. Methaneproduction increased non-linearly over time and all factors (temperature, drying intensity and duration) influenced the pattern of post-drying CH4 production. Peat undergoing more intense and longer drying events required a longer lag time before substantial CH4 production occurred and warmer conditions appeared to speed up the process.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER104533
BAYCEER103870
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Hydrology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Hydrology > Chair Hydrology - Univ.-Prof. Dr. Stefan Peiffer
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Research Institutions > Research Units > Limnological Research Station
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
Research Institutions > Research Units
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 12 May 2015 06:11
Last Modified: 27 Apr 2016 09:06
URI: https://eref.uni-bayreuth.de/id/eprint/13361