Spotting zones of dissimilatory sulfate reduction in a forested catchment:: the 34S-35S approach

被引:42
作者
Alewell, C
Novak, M
机构
[1] Univ Bayreuth, BITOEK, Dept Soil Ecol, D-95440 Bayreuth, Germany
[2] Czech Geol Survey, Prague 15200 5, Czech Republic
关键词
stable sulfur isotopes; sulfur metabolism; S-35; radiolabeling;
D O I
10.1016/S0269-7491(00)00137-8
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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.
引用
收藏
页码:369 / 377
页数:9
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