| Summary: Pure Oriental Beech (Fagus orientalis Lipsky.) stands which naturally distributed in Sinop directrorate of Forestry were subject of this study. Effects of some ecological factors on growth were investigated. Study area is located in Middle Black Sea region. Sampling method for this study was selection-sampling on terrain. 98 samples were taken in this way. Physiographic, edafic, climatic and biotic factors were analyzed for every sampling area. Soil profiles were opened and soil samples were taken according to soil horizons. Analyses, such as texture, pH, organic matter, available water capacity, were made on samples. Also, in order to determine site index based on stem analysis, 3 trees from per study site, total of 294 trees, were cut down. Results of the study showed that rotation length for pure oriental beech stands in lower zones (0-800m) was 87 years and mean age for heartrot strating age was 60 years while higher zones had mean rotation length of 90 years and mean heart rot starting age of 87. Statistical analyses were made to determine the relation between results of the analyses. There were positive relations between site index, Btsh horizon organic matter, altitude, Ah horizon organic matter, Btsh horizon organic matter while heartrot, Btsh horizon organic matter, Btsh horizon clay-pH-EC, Cv horizon thickness-pH-EC had positive relations. Btsh horizon thickness and aspect had a negative relation.
Key Words: Oriental Beech (Fagus orientalis Lipsky.), Ecological Factors, Site Index, Sinop Directorate of Forestry
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