Sezonowe zmiany uwalniania fosforu z osadów dennych w jeziorze Rusałka w trakcie zabiegów rekultywacyjnych

Paper presents a comparative study of phosphorus (P) internal loading from bottom sediments in Rusalka Lake in years 2006 and 2007, when restoration measures were conducted and in 2005, a year before restoration. Internal loading of P decreased as an effect of applied treatment. The mean loading in 2005 was 9.07 mg P m–2 d–1, whilst in next two years it was 4.36 mg P m–2 d–1 and 2.28 mg P m–2 d–1, respectively. The reduction reached 51 % in 2006 and 75 % in 2007. A domination of P release was noted in 2005 and 2006, amounting in summer to 38.1 mg P m–2 d–1 in the deepest place of the lake and 15.6 mg P m–2 d–1 in the littoral zone. A period of accumulation supremacy was observed in spring 2007, reaching 4.9 mg P m–2 d–1 in the littoral and 2.8 mg P m–2 d–1 in the profundal.Praca prezentuje zmiany uwalniania fosforu z osadów dennych w jeziorze Rusałka w latach 2006–2007, kiedy prowadzono rekultywację zbiornika z użyciem siarczanu(VI) żelaza(III). W wyniku przeprowadzonych zabiegów rekultywacyjnych zasilanie wewnętrzne w fosfor z osadów dennych wyraźnie zmniejszyło się. Średnie zasilanie wewnętrzne przed wykonaniem zabiegów rekultywacyjnych wynosiło 9,07 mg P m–2 d–1, w kolejnym zmniejszyło się do 4,36 mg P m–2 d–1 (redukcja o 51 %), a w ostatnim roku do 2,28 mg P m–2 d–1 (redukcja o 75 %). W latach 2005 i 2006 stwierdzano wydzielanie fosforu z osadów dennych, dochodzące w okresie letnim do 38,1 mg P m–2 d–1 w obrębie głęboczka i do 15,6 mg P m–2 d–1 w litoralu. W ostatnim roku badań wiosną, nie następowało wydzielanie P z osadów, a kumulacja P osiągnęła 4,9 mg P m–2 d–1 w litoralu i 2,8 mg P m–2 d–1 na głęboczku

Sustainable lake restoration: from challenges to solutions

Sustainable management of lakes requires us to overcome ecological, economic, and social challenges. These challenges can be addressed by focusing on achieving ecological improvement within a multifaceted, co-beneficial context. In-lake restoration measures may promote more rapid ecosystem responses than is feasible with catchment measures alone, even if multiple interventions are needed. In particular, we identify restoration methods that support the overarching societal target of a circular economy through the use of nutrients, sediments, or biomass that are removed from a lake, in agriculture, as food, or for biogas production. In this emerging field of sustainable restoration techniques, we show examples, discuss benefits and pitfalls, and flag areas for further research and development. Each lake should be assessed individually to ensure that restoration approaches will effectively address lake-specific problems, do not harm the target lake or downstream ecosystems, are cost-effective, promote delivery of valuable ecosystem services, minimize conflicts in public interests, and eliminate the necessity for repeated interventions. Achieving optimal, sustainable results from lake restoration relies on multidisciplinary research and close interactions between environmental, social, political, and economic sectors

Sustainable lake restoration: From challenges to solutions

Sustainable management of lakes requires us to overcome ecological, economic, and social challenges. These challenges can be addressed by focusing on achieving ecological improvement within a multifaceted, co‐beneficial context. In‐lake restoration measures may promote more rapid ecosystem responses than is feasible with catchment measures alone, even if multiple interventions are needed. In particular, we identify restoration methods that support the overarching societal target of a circular economy through the use of nutrients, sediments, or biomass that are removed from a lake, in agriculture, as food, or for biogas production. In this emerging field of sustainable restoration techniques, we show examples, discuss benefits and pitfalls, and flag areas for further research and development. Each lake should be assessed individually to ensure that restoration approaches will effectively address lake‐specific problems, do not harm the target lake or downstream ecosystems, are cost‐effective, promote delivery of valuable ecosystem services, minimize conflicts in public interests, and eliminate the necessity for repeated interventions. Achieving optimal, sustainable results from lake restoration relies on multidisciplinary research and close interactions between environmental, social, political, and economic sectors