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Changes in the delta S-34 ratio of pore-water sulfate in incubated Sphagnum peat

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Groscheová, Hana ; Novak, Martin ; Alewell, Christine:
Changes in the delta S-34 ratio of pore-water sulfate in incubated Sphagnum peat.
In: Wetlands. Bd. 20 (2000) Heft 1 . - S. 62-69.
ISSN 1943-6246
DOI: https://doi.org/10.1672/0277-5212(2000)020[0062:CITSRO]2.0.CO;2

Abstract

Sulfur transformations in freshwater peat were studied using contrasting stable isotope signatures of atmospheric input (high delta34S) and Sphagnum peat substrate (low delta34S). Wet subsurface peat samples from the Lehstenbach watershed, Fichtelgebirge, Germany were incubated anaerobically at 5 and 15°C. Pore-water sulfate was augmented with natural precipitation at the onset of the experiments. Sulfate concentrations and delta34S ratios of residual pore water were measured in 1-day intervals (9 days) and 1-week intervals (7 weeks) at 15°C, and in 1-week intervals (7 weeks) at 5°C. Initially, SO42- concentrations decreased (by 50 to 85%) and delta34S ratios increased (by as much as 16 parts per thousand) at both temperatures due to bacterially-mediated dissimilatory sulfate reduction. At the higher temperature (15°C), the S isotope effect (Delta delta34S) was higher than at the lower temperature (5°C). On day 4 (at 15°C) and day 29 (at 5°C), the delta34S ratio of pore-water sulfate started to decrease by as much as 20 parts per thousand. The changing S isotope composition provided evidence for a dynamic turnover of the pore-water sulfate pool in anaerobic pest. The observed delta34S pattern could not be explained solely by isotope selectivity of the sulfate-reducing bacteria. Sulfur isotope data indicated a replenishment of the sulfate pool by hydrolysis of ester-sulfate.

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER7454
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Bodenökologie
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 09 Okt 2015 05:56
Letzte Änderung: 09 Okt 2015 05:56
URI: https://eref.uni-bayreuth.de/id/eprint/20281