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Sulfate reduction in a forested catchment as indicated by δ34S values of sulfate in soil solutions and runoff

Title data

Alewell, Christine ; Giesemann, Anette:
Sulfate reduction in a forested catchment as indicated by δ34S values of sulfate in soil solutions and runoff.
In: Isotopes in Environmental and Health Studies. Vol. 32 (1996) Issue 2-3 . - pp. 203-210.
ISSN 1477-2639
DOI: https://doi.org/10.1080/10256019608036312

Abstract in another language

In a forested catchment in the Fichtelgebirge mountains (NE-Bavaria, Germany) the long term SO42- budget (average 1988 - 1994) indicated that about 40% of the input with throughfall (16.8 kg SO4-S.ha-1.yr-1) was retained in the catchment. In order to identify processes acting as potential SO42- sinks, d34S values of SO42- in soil solutions and runoff were measured between May and November 1994. d34S values of the runoff and the fen were higher (5.8 & #137;) than the d34S values of the soil solution of the oxic soils in the terrestrial area (3.9 & #137;). Because there is no lithogenic S source within the catchment, it can be assumed that SO42- deposition is the only S source in the catchment. Thus the results were interpreted as a result of SO42- reduction within the catchment, because the uptake of 32S is favored during the dissimilatory SO42- reduction and 34S is consequently enriched in the soil solution. To estimate the amount of SO42- reduced, isotopic fractionation factors between -9 & #137; and -46 & #137; were considered, resulting in SO42- reduction rates of 1.8 - 9.3 kg SO42-S.ha-1.yr-1. It was concluded that besides dissimilatory SO42- reduction another sink exists in the catchment (e.g. SO42- sorption in deep soil layers).

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER6980
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: 22 Oct 2015 07:29
Last Modified: 22 Oct 2015 07:29
URI: https://eref.uni-bayreuth.de/id/eprint/20746