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Influence of liming to alkalinity pond soil and ANC4,5 of water
KOLEK, Bohuslav
The aim of the master thesis was to assess volume of disposable calcium in the ponds sediments and acid neutralization capacity of water, pH of water, oxygen saturation and zooplankton abundace during vegetation period. Following to the indicators was found out ponds production as well. Studies took place on 6 ponds (Byňovský, Dolní Velký, Kačák, Nakolický, Nový v Oboře, Žár) of company Fyshery New Castles s. r. o. For control was chosen pond Farský which is managed by Czech Fishing Union. Volume of disponable calcium in ponds sediments was transferred with infusion of 0,1 M H2CO3 . Volume of calcium was determined with chelatometric titration method. In 2013 the samples of sediments were collected before vegetation period. During the next season were determined samples of oxygen, ANK4,5 of water, pH of water and zooplankton which was sorted according its size (<500m and >500 m. At all monitored ponds was found out close relation between to volume of Ca2+ in pond sediment and pH of water, ACN4,5 of sediments and also with ACN4,5 of water during vegetation period. The highest average values of ACN4,5 of water were found out on pond Kačák (0,93 mmo.l-1), Žár (1,01 mmol.l-1) and Nový v Oboře (0,83 mmol.l-1), which significantly correlated with reserve of pond calium during dormancy. Was found out significant corelation between total growth of fish and coarse zooplankton. More significant relation was found out between total growth of fish and total abundance of zooplankton but between natural growth of fish and total abundance of zooplankton as well. The highest growths were found out on Ponds (Kačák, Žár), whose samples showed the biggest abundance of zooplankton from all monitored ponds and vice versa it wasn't confirmed relation between ACN4,5 of water during vegatation period and pH of water, abundance of coarse zooplankton and oxygen regime of water.
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