Groscheová, H; Novák, M; Alewell, C: Changes in the d34S ratio of pore-water sulfate in incubated sphagnum peat, Wetlands, 20/1, 62-69 (2000)
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.
Aktuelle Termine


BayCEER-Kolloquium:
Do. 16.05.2024
Dimethylated thioarsenates: potentially dangerous hidden arsenic species in rice and rice products
Dialog:
Fr. 17.05.2024
Forum Zukunftswald: Bodenvegetation: Erkennen und deren Bedeutung für den Waldbau
Ökologisch-Botanischer Garten:
So. 05.05.2024
Führung | Faszination Englische Gärten: Gestaltung und Pflanzen
So. 05.05.2024
Midissage | da capo - Ausstellung von Doris Bocka
Mi. 15.05.2024
Kurzführung | "Botanische Mittagspause"
Wetter Versuchsflächen
Luftdruck (356m): 973.8 hPa
Lufttemperatur: 21.6 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: 7 h/d

...mehr
Lufttemperatur: 19.1 °C
Niederschlag: 0.0 mm/24h

...mehr
Diese Webseite verwendet Cookies. weitere Informationen
✖