Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9447416 | Ecological Engineering | 2005 | 12 Pages |
Abstract
Changes in benthic retention and mobility of P were studied in a chronosequential approach in acid (pH 2.5-3.5) to moderately acid (pH 5.6-6.8) mining lakes (MLs) with respect to the threat of eutrophication during maturation. Although various MLs exhibit a high pelagic P availability there is currently no distinct threat of an enhanced eutrophication due to a C limitation and a high benthic P immobilization potential. The sequential P extraction applied revealed an increase in sedimentary total P with increasing pH due to the additional uptake of P by Al- and Fe-hydroxides, but no increase in mobile P forms. Currently, the excess in reactive Fe at a high Fe:P ratio in surface sediment at pH â¼3 favours an efficient P precipitation of Fe-oxi-hydroxides with a high specific surface area for P adsorption. However, an enhanced future P mobility of ML sediments and a threat of eutrophication results from: (1) a distinct reduction of the import of Fe and Al from the catchment over time, resulting in a lower supply towards the sediments, and (2) a reduction in the sedimentary Fe mineral surface area due to the future rise in pH.
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Authors
Andreas Kleeberg, Björn Grüneberg,