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Hydrochemical characteristics of selected fishponds in the current conditions in relation to the basin management.
PERGLOVÁ, Veronika
Fishponds and their ecosystems perform a number of important functions. Except to their economic importance, ponds contribute to the formation of the landscape, the local climate, increase biodiversity and affect the retention of water and its quality. Rod Pond is in a protected nature reserve, and therefore it is in a modified economic regime, compared to other ponds in the Třeboň region. Due to the limitations of the semi-intensive economic farming system in recent years, the pond and its shores are an important home for waterfowl, amphibians and other organisms. Rod Pond is also very importance in the retention and conversion of various forms of phosphorus and nitrogen, thereby it reduce eutrophication and it contributes to improvement of the water quality. In this work was evaluated the seasonal (2019) and long-term development (se-lected years in the period from 1992 to 2019) of physicochemical indicators of water quality in the Rod pond in relation to fisheries management and river basins. It was evaluated impact of the water chemistry in depend on the sampling profile on this fishpond Rod, including the analysis of sediments from these various sampling locali-ties. Concentrations of the main nutrients of the sediments were compared with the analysis of the sediment from 2015, which showed that the sediment is still increas-ing the concentrations of nitrogen and phosphorus. Overall, the fishpond Rod shows itself like dynamic ecosystem. Despite the above-mentioned precautions in the fish management, fishpond is still hypertrophy, although it shows much lower levels of total phosphorus and chloro-phyll than it flows from the fishpond Naděje. To improve the quality of water in the fishpond and in the whole catchment area, it is important to limit the high inputs of nutrients into catchments basin and to reduce its own internal nutrient load by using the method of differentiated removal of part of the sediment.
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