Dynamika zmian stanów wód gruntowych i uwilgotnienia gleb siedlisk leśnych w zlewni cieku Hutka

W pracy wykorzystano wyniki badań terenowych przeprowadzonych w 2008 roku przez pracowników Katedry Melioracji, Kształtowania Środowiska i Geodezji Uniwersytetu Przyrodniczego w Poznaniu. Charakterystykę meteorologiczną roku hydrologicznego 2008 przedstawiono na tle danych z wielolecia 1986÷2008 ze stacji Arboretum - Zielonka Leśnego Zakładu Doświadczalnego w Murowanej Goślinie. Dodatkowo w pracy wykorzystano informacje z Planu Urządzania Lasu Nadleśnictwa Doświadczalnego Zielonka na okres od 1 stycznia 2004r. do 31 grudnia 2013 r., z operatu glebowego Nadleśnictwa Do-świadczalnego Zielonka oraz z operatu Typów Siedliskowych Lasu, Roślinności Rzeczywistej i Potencjalnej Nadleśnictwa Doświadczalnego Zielonka, stan na 28.06.2002 (2002).

The purpose of the research work was to estimate the dynamics of the water content in soils variation in the drainage catchment of Hutka watercourse to Huta Pusta section in hydrologic year 2008. Considered afforested drainage catchment, size of 0.52 km2, is placed in the central part of Wielkopolska in Puszcza Zielonka. The Hutka catchment is of a typical forest character and presents high retentional capabilities. During the research detailed analyses were made for the dynamics of the groundwater level and water storage in 50 cm, and 100 cm soil layer. Meas-urements of water level were taken in 13 measuring wells, the water reserves in two measurement profiles. The results of water content in soils, were elaborated by using the ECH2O sounder. The research proved, that the dynamics of the water content in soils variation and ground water level in analyzed drainage catchment is described by similar cyclicity and depends mostly on the course of meteorological conditions, especially on the distribution and dimension of rainfalls. It was confirmed that the low level of groundwater table in the vegetation season does not affect significantly the water reserves of the surface layer of soil. Additional elements affecting the level of groundwater are also: the dis-tance between measurement wells and the watercourse, site type and the layout of the land. The unfavourable distribution of precipitation, high air temperature and high evapotranspiration, which occurred in June resulted in a significant decrease in water supplies in the investigated soil profiles and also in both analyzed layers. During this period, lowest values of water storage below the limit of permanent wilting and changing in a 0.5-meter layer from 8 mm (profile 4) to 19 mm (profile 13), in a 1-meter layer from 11 mm (profile 4) to 25 mm (profile 13) were recorded.