Influence of water source on frequency of Phytophthora occurrence was the purpose of this study. Phytophthora spp. was detected in 3 rivers, 2 canals and 2 ponds. Rivers were situated in different part of Poland. Two of them (Jasieniec and Pisia) is following through horticulture areas, whereas Wisła - through area with hardy ornamental nursery stocks. Water canals and ponds are situated nearly or in nursery. Rhododendron leaves baits cv. ‘Nova Zembla' were used for detec-tion Phytophthora in water from March to November. Number of necrotic spots on baiting leaves was the measure of population density of Phytophthora in water. Phytophthora spp. were detected from water from March to November. In canals, the most of necrotic spots on baiting leaves were observed in May and June. In rivers Jasieniec and Rawka and water ponds significantly more necrotic spots on baiting leaves were noticed in March, April, May and in September, October and November. P. cirticola was recovered as the most often occurring species and next P. cryptogea, P. cinnamomi, P. citrophthora, P. taxon Salixsoil.
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The results of research on influence of insolation on oxygen condition in carp pond are present in this paper. Mean of dissolved oxygen concentration observed at 8 am were equal 7,18 mg O2•dm-3, at 2 pm - 12,23 mg O2•dm-3 and at 8 pm - 12,79 mg O2•dm-3. Large fluctuations of dissolved oxygen concentration in the euphotic zone of eutrophic fish pond were observed. Oxygen condition lower then lower limit of dissolved oxygen concentration for carp (5 mg O2•dm-3) were observed at 8 am (minimum = 2,40 mg O2•dm-3). The highest oxygen concentration were observed in the afternoon (14 pm) and in the evening (8 pm). Analysis of connection between insolation and dissolved oxygen concentration revealed weak but essential relationship for the results at 8 am, 2 pm and 8 pm. Increase of oxygen concentration was observed with increasing of insolation.
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The main purpose of the paper was to determine the influence of catchment management on the bottom sediments quality of small water reservoirs as well as to determine toxic metal content in rushes. Samples of bottom sediments were collected in winter 2013 year, form 4 sediment layers (0-5, 5-10, 10-20 and 20-30 cm) at three points along the body of water. The 48 samples were collected. Soil material was prepared according to the procedures used in soil science, the analysis was performed for the fraction with a particle diameter of less than 1 mm. Plant samples from single species aggregations were randomly cut from 5 to 10 locations of 20-50 m2 area. From these samples the average composite sample was prepared. The total content of such elements as Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, Zn was determined by atomic absorption spectrometry (using the Thermo Scientific iCE 3000 series spectrometer) after prior digestion in the mixture (5:1) of concentrated acids HNO3 (65%) and HClO4 (60%). Total Hg content was determined by the AMA 254 analyzer. Between the small water reservoirs adjacent to the areas where organic farming is used, and the reservoirs adjacent to the areas with mineral fertilization ...
The main purpose of this work was to determine the degree of negative impact of heavy metals accumulated in the water sediments to aquatic organisms. Samples of sediments were collected in winter 2013, from 4 layers of sediment (0-5, 5-10, 10-20 and 20-30 cm) at three points along the water reservoir. Sediments were prepared for analysis in accordance with the procedures applied in soil science. The analysis was carried out for the fraction with a particle diameter less than 1 mm. The total content of such elements as Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn, was determined by atomic absorption spectrometry (using the Thermo Scientific iCE 3000 series spectrometer) after digestion in a mixture (5:1) of concentrated acid HNO3 (65 %) and HClO4 (60%). The total Hg content was obtained by using the AMA 254 analyzer. Only the lead content in the analyzed samples of bottom sediments exceeded the contamination value given by polish law (the Regulation of the Minister of Environment). According to the classification of PGI samples of sediments are classified mainly as medium polluted sediments (Class II), with the exception of zinc and lead concentrations (Class III). Due to the value of the indicator ...
