Spotting zones of dissimilatory sulfate reduction in a forested catchment : the S-34-S-35 approach
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
ID 86901
Author(s) Alewell, C; Novak, M
Author(s) at UniBasel Alewell, Christine
Year 2001
Title Spotting zones of dissimilatory sulfate reduction in a forested catchment : the S-34-S-35 approach
Journal Environmental pollution
Volume 112
Number 3
Pages / Article-Number 369-377
Keywords stable sulfur isotopes, sulfur metabolism, S-35 radiolabeling

The localization of sulfate reducing sites in forested catchments is of major importance, because dissimilatory sulfate reduction can be a considerable sink for deposited sulfate. To localize dissimilatory sulfate reduction sites in a forested catchment (northeastern Bavaria, Germany), three sites within the catchment (upland site, intermittent seep, fen) were investigated for delta S-34 depth profiles of soil sulfur and potential sulfate reduction rates were measured with S-35 radiolabeling. Stable sulfur isotopes indicate that aerobic metabolism is the dominant process on the upland site and the intermittent seep (delta S-34 Of soil sulfur between + 1.6 and + 9.0 parts per thousand) and dissimilatory reduction is not a significant sink for sulfate. However, results of the S-35 radiolabeling indicated for the upland site that the soil has potentially high sulfate reduction rates under laboratory conditions. Soil sulfur of the fen was markedly depleted in S-34 (delta S-34 between -6 and +2.6 parts per thousand). Both, S-34 and S-35 data indicated that dissimilatory sulfate reduction is an ongoing process on this site. The S-34 and S-35 approaches are complementary. While measurements using S-35 can show momentary potential for dissimilatory bacterial sulfate reduction, delta S-34 data reflect long-term predominance of either assimilatory or dissimilatory S metabolism at a particular site. (C) 2001 Elsevier Science Ltd. All rights reserved.

Publisher Elsevier
ISSN/ISBN 0269-7491
Full Text on edoc No
Digital Object Identifier DOI 10.1016/S0269-7491(00)00137-8
ISI-Number WOS:000167622400009
Document type (ISI) Article

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