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- Title
Effects of land use in the drainage area on phosphorus-binding and mobility in the sediments of four drinking-water reservoirs
- Authors
Ulrich, K.-U.
- Abstract
The study of four drinking-water reservoirs demonstrates how the anthropogenic land use of a catchment may affect binding and mobility ofphosphorus in the sediment. Pdiss concentration gradientsat the sediment-water interface were measured to calculate potentialdiffusive release rates. P binding forms were determined by sequential extraction of fresh sediment and settling seston. Main study siteswere Saidenbach Reservoir (mesotrophic, densely populated drainage area with 73% agricultural land use) and Neunzehnhain Reservoir (oligotrophic, unpopulated drainage area forested to 80%) in the silicate-rich Erzgebirge mountains of eastern Germany. Tot-P concentrations andP binding forms of typical erosive matter from each catchment were similar to the sediment of both pre-reservoirs and reservoirs' mouth. In Saidenbach Reservoir, diatoms responded to high nutrient loading by incorporating ortho-P. While settling, the org-P was partly transformed to Fe(OOH) ~~ P. Apart from hypolimnetic O2 depletion, this P binding form dominated in the surface sediment mainly in front of the dam. With increasing sediment depth, org-P and Fe(OOH) ~~ Pnot only redissolved into the pore water, but also adsorbed onto Al compounds. In Neunzehnhain Reservoir, acidification of the low buffered catchment favoured loading of humic compounds and Al3+ ions, which precipitated and redox-independently adsorbed ortho-P dueto a pH increase in the lake. Neunzehnhain sediment was able to immobilize Fe(OOH) ~~ P from Saidenbach sediment in a batch experiment. Comparative sequential P extraction of sediment from Sosa Reservoir (oligo-mesotrophic, sparsely populated drainage area forested to 94%) and Kleine Kinzig Reservoir (nearly unpopulated drainage area forestedto 98%) also demonstrated effective P immobilization by Al-/humic compounds. It is concluded that the absence of settlements in the catchment, together with forestry as dominating land use, favour not only oligotro
- Subjects
EUTROPHICATION; WATER quality
- Publication
Hydrobiologia, 1997, Vol 345, Issue 1, p21
- ISSN
0018-8158
- Publication type
Article
- DOI
10.1023/A:1002919129524