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Open AccessArticle
Spatial and Temporal Variability in the Bottom Sediment Characteristics of a Shallow Lake under Backwater Separation and Application of Effective Microorganisms
by
Renata Dondajewska-Pielka
Renata Dondajewska-Pielka
Department of Water Protection, Faculty of Biology, Adam Mickiewicz University, 61-614 Poznan, Poland
Sustainability 2024, 16(19), 8650; https://doi.org/10.3390/su16198650 (registering DOI)
Submission received: 1 September 2024
/
Revised: 23 September 2024
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Accepted: 3 October 2024
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Published: 6 October 2024
Abstract
Lake Konin is a small and shallow lake under the influence of highly eutrophic riverine waters. Feeding the lake as a backwater during high water level periods, the River Obra had exerted a decisive impact on lake water quality, and thus a new dike with a closing device was created. Protective measures were followed by the application of Effective Microorganisms (EM), aiming at a reduction in nutrient concentrations and CyanoHABs. Positive changes in the ecosystem were initiated (increased phytoplankton diversity), but cyanobacteria blooms were still present due to high nutrient content. Some changes were observed in the lake sediments (phosphorus (P) and its fractions, P in pore waters, organic matter and experimental assessment of internal P loading) studied before and during treatment. A slight increase in P content in sediments was noted, as a result of an increase in the Res-P fraction. Simultaneously, a decrease in the most mobile fractions was observed. Summer internal P load was reduced from 5.4 kgP d−1 before the treatment to less than 1 kgP d−1 in the first year, but increased again in the second year to 4.5 kgP d−1. Similarly to lake water quality, positive changes were induced in the lake sediments; nevertheless, they still acted as an important source of nutrients for primary producers. Additional restoration methods shall be considered, as combined treatments used simultaneously are reported to be the most effective for water quality improvement.
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MDPI and ACS Style
Dondajewska-Pielka, R.
Spatial and Temporal Variability in the Bottom Sediment Characteristics of a Shallow Lake under Backwater Separation and Application of Effective Microorganisms. Sustainability 2024, 16, 8650.
https://doi.org/10.3390/su16198650
AMA Style
Dondajewska-Pielka R.
Spatial and Temporal Variability in the Bottom Sediment Characteristics of a Shallow Lake under Backwater Separation and Application of Effective Microorganisms. Sustainability. 2024; 16(19):8650.
https://doi.org/10.3390/su16198650
Chicago/Turabian Style
Dondajewska-Pielka, Renata.
2024. "Spatial and Temporal Variability in the Bottom Sediment Characteristics of a Shallow Lake under Backwater Separation and Application of Effective Microorganisms" Sustainability 16, no. 19: 8650.
https://doi.org/10.3390/su16198650
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