Zmiany zapasów wody w latach o różnych sumach opadów, w śródleśnych oczkach wodnych, na przykładzie Leśnictw Wielisławice i Laski Water Storage Changes in Years with Different Precipitation Sums, in Ponds Located in the Forest, on the Example of Wielisławice And Laski Forestry
The paper presents the results of researches carried in 2002/2003, 2003/2004 and 2009/2010 hydrological year in catchments pond No 1 and 6 located in Wielsiławice and Laski Forestry at Siemianice Experimental Forest Farm of Poznań University of Life Sciences located about 15 km south-east from Kępno. Analysed areas there are situated is a part of Niesób and Pomianka catchments – left-side tributary of Prosna River. The catchment area of pond No 1 is 7.6 ha, and there is forestation 100%. Whereas the catchment area of pond No 6 is about 37 ha, there is forestation 40% and the rest 60% area investigated catchment is arable lands. Predominance forest habitat in catchments analysis ponds is fresh mixed broadleaved forest, about area 95%, where predominant species of tree stand is 100 years old pine. Analysis pond No 1 and 6, of mild scarps, are natural pond melting out. Area of pond No 1 is 0.13 ha, whereas pond No 6 is 0.35 ha, and averages depths are properly 1.0 m and 1.4 m. Hydrological year 2002/2003, in which the rainfall total was 68 mm lower than average multiannual rainfall, was a dry year. In average hydrological year 2003/2004 rainfall total was 47 lower than multiannual rainfall. Whereas hydrological year 2009/2010, in which the rainfall total was 281 mm higher than average multiannual rainfall, was a wet year. The researches confirmed, that water storages in pond No 1 and 6 renovation in year cycle was depend of meteorological conditions. Water level changes and related water storage changes were especially connected to precipitation sums in individual half-year analysis year. The researches show to, that in all analyzed hydrological years higher water storage changes about -100 mm to 480 mm, in pond No 1, were has about 0.22 ha lower area than pond No 6. Whereas changes water storage in pond No 6 reached, in analyzed years, value about -25 mm to 340 mm.
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