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Riparian Zones in a Forested Catchment: Hot Spots for Microbial Reductive Processes

  • K. Küsel
  • C. Alewell
Part of the Ecological Studies book series (ECOLSTUD, volume 172)

Abstract

Anthropogenic deposition of protons, sulfate and nitrate has resulted in acidification of the groundwater in forested catchments (Hamm 1995). Nitrate and sulfate are leached from the upland aerated soils into lower situated soils and waterlogged fens with each rainfall. Under anoxic conditions in soils, nitrate and sulfate can be reduced by microorganisms and alkalinity is generated (Sexstone et al. 1984; Tiedje et al. 1984). Thus, depending on the soil characteristics, climatic parameters, and the composition of the soil microbiota, wetland soils may act as long-term sinks for deposited protons, sulfate, and nitrate. There is a principal difference between the retention of nitrate and sulfate in wetlands with respect to the sink function. The microbial reduction of nitrate leads to gaseous products, like or N2O or N2, which are lost to the atmosphere. Thus, the generation of alkalinity is permanent, and wetlands act as long-term sinks. In contrast, the reduction of sulfate leads to the formation of sulfide, which can be either fixed in the presence of iron as iron sulfides or as organic reduced sulfur, or it can be oxidized back to sulfate under changing redox conditions (Wieder and Lang 1988; Fig. 22.1). In the latter case, wetlands would not act as a long-term sink for sulfate.

Keywords

Soil Solution Sulfate Reduction Riparian Zone Peat Layer Upland Soil 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2004

Authors and Affiliations

  • K. Küsel
  • C. Alewell

There are no affiliations available

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