Determination of important weed species, their distributions and densities in grasslands of Trabzon province, Turkey

This study was carried out to determination important weed species, the available frequency, common covering and density of weeds in grasslands of trabzon province in 2008-2009. surveys were conducted in 214 sampling areas belong to 80 grasslands of trabzon province (central district, akçaabat, araklı, çaykara, dernekpazarı, hayrat, köprübaşı, maçka, sürmene, tonya, vakfıkebir and yomra). the random sampling was made according to representing at least 1% of the areas of grassland. 1/4 m² were taken in a sampling area at least 20 times. the weeds within the frame were counted, the frequency, common covering and density of weeds were determinated. sixty weed species and forty eight genus belong to twenty four families (1 pteridophyta, 4 monocotyledonae, 19 dicotyledonae) were identified in the grasslands surveyed. the most commonly found families were asteraceae (10 species), apiaceae (6 species), lamiaceae (6 species), scrophulariaceae (5 species), liliaceae (4 species) ve polygonaceae (3 species). the most common weed species were alchemilla pseudocartalinica juz., pteridium aquilinum (l.) kuhn, euphorbia oblongifolia c. koch, veratrum album l., silene vulgaris (moench) garcke, digitalis ferruginea l., hypericum perforatum l., conium maculatum l. and alchemilla orduensis b . pawl. in pasture areas surveyed.