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The present study discusses the characteristic of the land and aquatic-land plant communities occurring in the Narew river valley within the Narew Landscape Park borders. The phytosociological research carried out in 1988-1994. The floristic composition has been performed by Braun-Blanquet method and recorded in 257 releves. Phytocenosis of 38 plant communities and 8 plant associations (21 communities of Phragmitetea class, 3 communities of Scheuchzerio-Cariceteafuscae class, 8 communities and 6 plant associations of Molinio-Arrhenatheretea class, 6 forest and scrub communities as well as 2 communities and 2 plant associations of the other classes) were identified in studied area of the Narew Landscape Park. Predominant communities of wetland tall-sedges occupy about 32% of the area, reed rushes and others of Phragmition alliance - over 16%, grass and sedge-grass rushes - about 14%, forests and scrubs on hydrogenic soils - almost 15% (tab. 1). The approximate ranges of the particular groups of plant communities are presented on the map (fig. 1). The disadvantageous changes of vegetation in the certain areas of this part of the Narew river valley followed mainly because of changes in water condition in the valley as well as on the adjoining areas. They require renaturalization by increasing of habitat moisture. In spite of this, the Narew Landscape Park borders is one of the biggest and the best preserved of wetlands in Poland.
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The present study discusses the current state of vegetation, humidity conditions and habitat production in the Narew river valley between Żółtki and the Biebrza river-confluence. Moisture meadow sites were identified by using plant indices (phytoindication method) and their productivity by using the method described in the first position of references. Cultivated meadows dominate in the part of the Narew river valley from Żółtki to the Biebrza river-confluence. They occupy almost 62% of the area. The profitable damped grasslands for grasslands farming (periodically too damp and moderation damp) predominate among them and occupy 86% of their area. Less profitable damped grasslands: periodically and long-periodically flooded occupy 14% of grasslands area, overdrained - 4% (tab. 1). The meadows belong to the 2nd, 3rd and 4th valuation class. Most of them are the 3rd class grasslands and the best of them - the 2nd class grasslands - occupy about 794 ha (tab. 2). Prospects of productivity of the characterized grasslands are comparatively high but unsatisfactorily utilized. Their current productivity constitutes 55,7% of potential production abilities. The main reason of existence of high production reserves are agrotechnical negligence and mistakes.
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