EN
The paper analyses changes in the structure of land use types, moisture category, soil types and subtypes and meadow types of reclaimed meadows environmental system in the Wkra River valley (part Bieżuń-Poniatowo) in two periods – after reclamation (1971) and recently (2001). The main reason of changes in the meadows natural environment has been decreased efficiency of melioration system. The changes were observed in the moisture category (53% area), in the soil subtypes (32% area) and in the meadow types (50% area) during 30-years agricultural use. Directions of durability index changes decrease the meadows agricultural value and farmers activity on the 50% of area, degrade the meadows natural value and make meadows reswamped.