The Effects of Limiting Restoration Treatments in a Shallow Urban Lake
| Autor: | Renata Dondajewska-Pielka, Joanna Rosińska, Katarzyna Kowalczewska-Madura, Ryszard Gołdyn, Lech Kaczmarek |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Chlorophyll a lcsh:Hydraulic engineering Geography Planning and Development chlorophyll a chemistry.chemical_element 010501 environmental sciences Aquatic Science 01 natural sciences Biochemistry nitrogen chemistry.chemical_compound Nutrient lcsh:Water supply for domestic and industrial purposes lcsh:TC1-978 parasitic diseases Phytoplankton phosphorus lake 0105 earth and related environmental sciences Water Science and Technology limited restoration lcsh:TD201-500 Biomanipulation 010604 marine biology & hydrobiology Phosphorus sustainable restoration Agronomy chemistry Wastewater Environmental science Water quality Aeration |
| Zdroj: | Water, Vol 12, Iss 1383, p 1383 (2020) Water Volume 12 Issue 5 |
| ISSN: | 2073-4441 |
| Popis: | Swarzędzkie Lake, directly polluted for many years with municipal wastewater and heavily loaded with nutrient compounds from the catchment area, has become degraded and strongly eutrophicated. Strong cyanobacterial blooms have contributed, among others, to the cessation of recreational use of this urban lake. Its sustainable restoration was started in autumn 2011. These treatments were a combination of three complementary methods: aeration with a pulverizing aerator, phosphorus inactivation with small doses of magnesium chloride and iron sulphate (< 15 kg ha&minus 1) and biomanipulation. These treatments were carried out for three years (2012&ndash 2014), and in the next two (2015&ndash 2016), treatments were limited from three to one method&mdash aeration. The obtained effects (a decrease in the number of cyanobacteria in phytoplankton and at the same time an increase in its biodiversity, decrease in chlorophylla concentration and improvement of transparency) were lost due to the cessation of phosphorus inactivation and biomanipulation. The biological balance was upset, which resulted in an increase in chlorophylla concentration, the return of cyanobacteria dominance in the phytoplankton and a deterioration of water quality. Leaving only a pulverizing aerator active, to maintain low oxygen concentrations near the bottom zone was not sufficient to ensure a gradual improvement of water quality with quite a significant external load of nutrients. |
| Databáze: | OpenAIRE |
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