TRENDS IN GROUNDWATER LEVEL CHANGES OF FOREST HABITATS IN SIEMIANICE FOREST EXPERIMENTAL FARM IN 2000-2009 PERIOD

Abstract

The paper presents the results of the researches carried out in 2000-2009 period in pond No. 1 catchment. The pond is located at Siemianice Experimental Forest Farm in Wielisławice forest district. This area is situated at South Wielkopolska Lowland and constitutes its southern frontier. In terms of hydrography, the object is a part of Niesób River catchment area, which is a left-bank tributary of the Prosna River. The catchment area is about 7.5 ha and the forestation is 100%. Fresh mixed broadleaved forest is the dominant area of the catchment. Fresh mixed coniferous forest stands also have a significant share in the catchment area. Moist mixed broadleaved forest stands occupy the rest of the area neighboring the No. 1 pond. Albic Arenosols (FAO1988) consist of sand (USDA) are prevalent in the area. The area of the mid-forest pond No. 1 covers about 0.13 ha. The average depth of the postglacial pond is approximately 1.0 m. It is worth noting that the average and dry years dominated in the analyzed period. The researches indicated that the groundwater level lowered by about 70 cm in this period. Retention decrease calculated for analyzed area was about 250 mm, considering the average soil porosity of about 36%.

Keywords

• small forest catchment
• mid-forest pond
• groundwater table