Wplyw zmian sposobu uzytkowania gruntow na liczebnosc i stan populacji wybranych gatunkow turzyc wilgotnych lak Zespolu Przyrodniczo-Krajobrazowego 'Morasko' w Poznaniu

The territory of the Wildlife and Landscape Protection Area in Morasko is a very valuable object with a seminatural landscape, covered by meadows, small paths of forests and fields. Unfortunately, the terrain is an area of intensive urbanization since about 10 years . Chosen species of genus Carex growing in the humid hay meadows have been monitored during last 8 years. In the case of populations of Carex acuta, Carex riparia and Carex acutiformis, the area covered by each species and conditions of the populations were significantly decreasing. In the case of the population of Carex panicea the area, density and condition of population were slightly increasing during the years of study. Observed effects can be connected with the changes of ground water level, which are probably the effects of influence of building-sites. The regression of populations of species of wetland ecosystems is a sign of harmful processes of simplification of landscape and decreasing of local biodiversity.