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The chemistry of the fishpond water ČR - long term development of the chemistry of the fishpond water - effect of eutrophication
STRNADOVÁ, Johana
The thesis deals with eutrophication of fishponds in the sixteen regions in the Czech Republic. Data about basic chemistry and nutrients (nitrogen and phosphorus) were evaluated in terms of temporal (during the years 1995 - 2003 and 2012) and spatial differences. ANOVA one-way and linear regression analysis, were used for detail description. Only regions (locality) Lednice, Brno, Ostrava and Řežabinec showed regular differences in most of the parameters. Between other regions individual differences were frequently found, mostly in conductivity and alkalinity, which are primarily reflect the different character of the catchments e.g. natural conditions. Less significant differences were observed in total N, and minimal differences were found in total P and chlorophyll. The high level of fishpond eutrophication has been also demonstrated by similarities in seasonal trends. Increasing the average value of the total P from 0, 23 mg/L to 0, 32 mg/L and increased chlorophyll concentration from 76 ?g/L to 218 ?g/L from spring to summer, are typical patterns for shallow fishponds heavily loaded with nutrients. The results allow to conclude, that fishpond eutrophication level is similar over the most of studied regions and remains unchanged during the last decades.
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Chemical parameters of surface waters in selected model ecosystems of the cultural landscape.
STRNADOVÁ, Johana
The aim of this study was to determine and compare the concentration of chemical parameters in five streams in Novohradské hory. Individual sampling points were different with their types of ecosystem, management practices, vegetation composition of growth and subsoil. Monitored parameters in forest ecosystems were: conductivity, pH, sulfate and calcium. In agrosystems observed parameters: electrical conductivity, pH, calcium, chloride and nitrate. The collected data generated graphs for the years 2005 - 2010. Based on the results we can say that natural mixed forest resists concentrations of sulphates and prevents the acidification of surface water. In contrast with spruce monoculture where surface water has the lowest pH because the sprice forest captures haigher quantitty of sulphates. Chemistry of water in agroecosystems corresponds to the flow through the landscape, which is used for economic activity. This was most evident in the stream, which in the upper sampling point flows through spruce monoculture and conductivity there was only 65 ?S.cm-1. On the contrary conductivity was substantially higher 175 ?S.cm -1 in the lower sampling point. Conductivity value of stream flowing through wet meadows, was 191 ?S. cm1. The measurement results confirmed that the water reaches the higher conductivity in the managed landscape.
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