| Alewell, C; Novák, M: Spotting zones of dissimilatory sulfate reduction in a forested catchment; The | |
| Abstract: 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. |
Aktuelle Termine
Aktuelle Termine
| BayCEER-Kolloquium: |
|---|
| Do. 06.04.2023 Human-Wildlife Conflicts (HWC) in Southern Africa |
| Dialog: |
| Mi. 01.03.2023 aktuell Main FlussFilmFest 2023 |
| Ökologisch-Botanischer Garten: |
| So. 02.04.2023 Führung | Rosen-Seide & Soja-Kaschmir: Textilien von morgen |
| So. 16.04.2023 Führung | Den ÖBG kennenlernen: Allgemeine Gartenführung |
| So. 16.04.2023 Ausstellungseröffnung | Die dünne Haut der Erde - Unsere Böden. |
Wetter Versuchsflächen