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Plant diversity indices for trojan fir stands in Aladag¨ region of Bolu Indeks biljne raznolikosti u sastojini trojanske jele u Aladag¨ regiji Bolu Emrah Erdog˘an, Hayati Zengin, Mehmet Özcan, Ahmet Salih Deg˘ermenci, Necmi Aksoy Summary 640 samples in quadrates of 0.5 x 0.5 m obtained by systematic sampling method were evaluated. Samplings were made in two repetitions in GA (old), GB (young), GC (medium-aged), and GD (irregular) stand types, on north and south aspects. Field studies were carried out in 4 different periods (June, July, August, September) within the vegetation period. 122 plant taxa were determined at the level of species and intraspecific taxa. While 48 of the 122 plant taxa in fir stands were seen only in one of the stands, 41 plant taxa were detected in all stands. 5 taxa were seen only in GA stands, 7 in GB, 15 in GC and 13 only in GD stands, while 8 taxa could not be identified due to the insufficient vegetative and generative organs of the collected samples. The richest stand type in terms of taxa number was determined as the GC stand type with 84 plant taxa, but more individuals per ha were counted in the GA and GD stand types. Key words: Trojan Fir, Plant diversity, Diversity indices, Stand, Aladağ, Turkey. INTRODUCTION UVOD Forests are composed of stands, and stands cause microclimatic conditions by affecting the amount of light reaching the soil. This affects litter decomposition and soil nutritive conditions. These differences are also important in shaping the existence and distribution of plant species, which are described as understory flora or above-ground vegetation, and thus plant diversity. Stand structure is one of the more important factors affecting the similarity of species in a region (Svenning and Skov, 2002). Ister and Gökbulak (2009) stated that stand types have a significant effect on above-ground vegetation, where mixed stands create better growth conditions, while pure stands allow for more frequent and high-diversity flora formation. Pitkanen (1997) stated that there is a high correlation between the change in above-ground vegetation and site or stand age, while basal area, tree species mixture ratio and crown cover are other important factors in this change. Therefore, it is necessary to investigate the existence of such relationships in different sites in terms of different tree species and stand types. Although forests are rich ecosystems in terms of biodiversity, there is not enough information about biodiversity values of different ecosystems to make comparisons or relative |