35S-sulphate reduction and transformation in peat |
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| Institution: | 1. University of Gdańsk, Faculty of Biology, Department of Genetics, Laboratory of Limnozoology, Wita Stwosza 59, 80-308 Gdańsk, Poland;2. University of Graz, Institute of Earth Sciences (Geology & Palaeontology), Heinrichstrasse 26, A-8010 Graz, Austria;3. Laboratoire des Sciences du Climat et de l’Environnement, UMR, Centre National de la Recherche Scientifique – Commissariat à l''Énergie Atomique (CNRS-CEA), Orme des Merissiers, 91191 Gif-sur-Yvette, France;4. GFZ German Research Centre for Geosciences, Section 5.2 – Climate Dynamics and Landscape Evolution, Telegrafenberg, 14473 Potsdam, Germany;5. Christian Albrechts University, Leibniz Laboratory for Radiometric Dating and Stable Isotope Research, Max-Eyth-Strasse 11-13, 24118 Kiel, Germany;6. Adam Mickiewicz University, Faculty of Geographical and Geological Sciences, Department of Biogeography and Palaeoecology, Dzięgielowa 27, 61-680 Poznań, Poland;7. Autonomous University of Madrid, Faculty of Sciences, Department of Ecology, 28049 Madrid, Spain;8. Budinskygasse 16/18, 1190 Vienna, Austria;9. Soumaya Belmecheri (LSCE, Gif-sur-Yvette, now at Pennsylvania State Univ.), Marc Desmet (ISTO, Univ. F. Rabelais, Tours), Helmut Erlenkeuser (Leibniz Lab., Kiel), Jérôme Nomade (Lab. Géodynamique Chaines Alpines, Grenoble);1. Department of Medicine, Division of Nephrology, Koc University School of Medicine, Istanbul, Turkey;2. Department of Medicine, Division of Nephrology, Konya Numune State Hospital, Konya, Turkey;3. Nephrology Clinic, Dialysis and Renal Transplant Center, ‘C.I. PARHON’ University Hospital, Romania;4. ‘Grigore T. Popa’ University of Medicine, Iasi, Romania;5. Department of Nephrology, Gülhane School of Medicine, Ankara, Turkey;6. Department of Radiology, Gülhane School of Medicine, Ankara, Turkey;7. Department of Biochemistry, Gülhane School of Medicine, Ankara, Turkey;8. Koc University School of Medicine, Ankara, Turkey;1. Programa de Pós-Graduação em Geociências/UFRGS, Av. Bento Gonçalves 9500, Cx.P. 15001, 91501-970 Porto Alegre, RS, Brazil;2. Instituto de Geociências/UFRGS, Av. Bento Gonçalves 9500, Cx.P. 15001, 91501-970 Porto Alegre, RS, Brazil;3. Laboratório de Palinofácies e Fácies Orgânica LAFO/DEGL/IGEO/CCMN/UFRJ, Av. Athos da Silveira Ramos, 274, Bloco J1, Sala 20, 21941-916 Rio de Janeiro, RJ, Brazil;4. Setor de Botânica e Paleobotânica, Museu de Ciências Naturais, Centro Universitário UNIVATES, Avenida Avelino Tallini, 171, 95900-000 Lajeado, RS, Brazil |
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| Abstract: | The incorporation of 35S-labelled sulphate into reduced inorganic forms and into organic S has been studied in peat samples from two contrasting sites, a deep blanket peat and a shallow hill blanket peat. During anaerobic incubation, 35S was rapidly incorporated into AVS (acid volatile sulphide), elemental S and Cr-reducible S but these pools showed evidence of rapid recycling. In the longer term, 35S was found in the ester sulphate pool and in a residual S pool, taken to be principally C-bonded organic S. Incorporation was more rapid in the deep peat than in the hill peat, in peat from wet areas more than dry areas and in subsurface (10–20 cm) peat more than in surface (0–10 cm) peat. Incorporation in the hill peat under aerobic incubation into either reduced inorganic or organic forms was very limited. Mean sulphate reduction rates at the temperature of incubation (26°C) were estimated to be in the range 60–12,000 μg S kg−1 wet weight peat d−1 while mean turnover times of reduced S were 17 and 550 d for the deep and hill peats, respectively. |
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