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Biogeochemical functioning of hydrologically modified peatlands and its effect in eutrophication of freshwaters

Kruk M.

Polish Journal of Ecology

2000

Vol. 48, nr 2

103-161

It has been found that, except for trace metals (Zn, Cu, Pb and Cd), peatlands having been hydrologically modified as a result of various anthropogenic activities do not play a barrier role for mineral elements incoming from the catchments and the atmosphere. In contrast, they may be a source of P compounds that additionally supply aquatic ecosystems. With use of multiple regression it has been revealed that eutrophication of peatlands and stream waters is favoured primarily by influks of biogenic elements from the catchments, dynamics of water storage by the peatland, amount and pH of precipitation, as well as by influence of numerous modifying ions. On a landscape scale, hydrologic changes of forest watersheds with peatlands, as well as deforestation and reduction of acreage of peat meadows in relation to arable lands are reasons of biogeochemical transformations of the lakeland landscape. Overall, these factors increase matter transfer from terrestrial to aquatic ecosystems.