Titlebar

Export bibliographic data
Literature by the same author
plus on the publication server
plus at Google Scholar

 

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

Title data

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

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER7454
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: 09 Oct 2015 05:56
Last Modified: 09 Oct 2015 05:56
URI: https://eref.uni-bayreuth.de/id/eprint/20281