Effects of experimental drying intensity and duration on respiration and methane production recovery in fen peat incubations |
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| Institution: | 1. Ecohydrology & Biogeochemistry Group, University of Münster, Heisenbergstraße 2, 48149 Münster, Germany;2. Leibniz Center for Agricultural Landscape Research (ZALF), 15374 Müncheberg, Germany;1. Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China;2. Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences and Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu 610041, China;3. Institute for Environmental Studies and SoWa Research Infrastructure, Faculty of Science, Charles University in Prague, Benátská 2, 128 44 Prague 2, Czech Republic;4. Laboratory of Soil Biodiversity, University of Neuchâtel, Rue Emile-Argand 11, Neuchâtel, Switzerland;5. Institute of Soil Biology, Biology Centre CAS and SoWa Research Infrastructure, Na Sádkách 702/7, 370 05 ?eské Budějovice, Czech Republic;6. Laboratory of Environmental Biotechnology, Institute of Microbiology of the CAS, Vídeňská 1083, 142 20 Prague 4, Czech Republic;1. Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada;2. Alberta Environment and Parks, Land and Forest Q3 Policy Division, AB, Canada;1. Laboratory of Plant and Microbial Ecology, InBioS, University of Liège, Botany Bât. 22, Chemin de la Vallée 4, 4000, Liège, Belgium;2. Section of Microbial Ecology, Department of Biology, Lund University, Ecology Building, 223 62, Lund, Sweden;3. Forest & Nature Lab, Department of Environment, Ghent University, Geraardsbergsesteenweg 267, B-9090, Gontrode, Belgium;1. Max-Planck-Institute for Terrestrial Microbiology, Karl-von-Frisch-Str. 10, 35043 Marburg, Germany;2. Joint Graduate School of Energy and Environment, King Mongkut’s University of Technology Thonburi, and Center for Energy Technology and Environment, Ministry of Education, Bangkok, Thailand;3. College of Resources and Environmental Sciences, China Agricultural University, Beijing, China;4. Departamento de Biosciencias, Facultad de Quimica, Universidad de Republica, General Flores 2124, Montevideo, Uruguay;5. Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Science, 100085 Beijing, China;6. UPMC, Université Paris 06, and CNRS, UMR 8222, Laboratoire d’Ecogéochimie des Environnements Benthiques-LECOB, Observatoire Océanologique de Banyuls, Banyuls/mer 66650, France;7. Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Department of Experimental Limnology, alte Fischerhuette 2, 16775 Stechlin, Germany;8. Géosciences Environnement Toulouse (GET), Observatoire Midi Pyréneés, Université de Toulouse, CNRS, IRD, 14 avenue E. Belin, 31400 Toulouse, France;9. Biogeochemistry Laboratory, Institute of Biology, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil;1. Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, PR China;2. Changchun University, Changchun 130022, PR China;3. Changshu Institute of Technology, Changshu 215500, PR China |
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| Abstract: | Drying and rewetting to a variable extent influence the C gas exchange between peat soils and the atmosphere. 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 after rewetting. Surface peat down to 5 cm contributed up to 67% (CO2) and above 80% (CH4) of the depth-aggregated (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 production was monitored over time and the recovery was standardized to pre-drying levels to compare the treatment effects. Methane production 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. |
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