Longitudinal Gradients in the Chemical and Microbial Composition of the Bottom Sediment in a Channel Reservoir (Saidenbach R., Saxony)

✍ Scribed by Dietrich Uhlmann; Michael Hupfer; Lothar Paul

• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 910 KB
• Volume: 80
• Category: Article
• ISSN: 1434-2944
• DOI: 10.1002/iroh.19950800103

✦ Synopsis

Saidenbach Reservoir is situated in the Erzgebirge Hills, Saxony, in a catchment with agriculture as the principal use and a high sensitivity to soil erosion. The high elimination of total phosphorus (ca. 70 %) mainly results from a) the sedimentation flux of planktonic diatoms and b) the adsorption to and sedimentation with mineral particles rich in iron. At stations with a high sulfide concentration in the 0-5 crn sediment layer (about 0.2 %), the P content was likewise high (about 0.3 %), probably due to the high iron concentration (more than 2.5 % of dry weight). A fractionation procedure showed that the major part of the sediment phosphorus was not sensitive to reductants (dithionite) but has been found only in the following extraction step (NaOH extract).

Abbreviations

DW Dry weight HWP LO1 Loss on ignition NRP Non-reactive phosphorus PR Prereservoir R Reservoir SRP Soluble reactive phosphorus TP Total phosphorus Surplus phosphorus (hot water extraction)