Yield models of pure fir (Abies nordmanniana S. subsp. bornmülleriana (Mattf.)) stands (Western Black Sea region).
Yield models are important tools in forest management planning because they can simulate stand development and production under various management alternatives. Yield of forest stands is determined using tables containing values of height, diameter, number of trees, volume, etc., for different site and age classes. These tables have been created by using basically mathematical equations with statistical analyses. Some species are of low economic importance, but all of them are of high ecological importance for the ecosystems. Abies nordmanniana subsp. bornmulleriana Mattf. is one of the both-way important tree species in Turkey. Hence, site index curves and yield tables for natural fir stands in the Western Black Sea region were developed. Data were collected from a total of 20 sample plots and 15 sample trees. Site index curves were used to classify into site classes of I, II and III, in order of decreasing productivity. The yield models can be calibrated on Turkish Forest Management Planning Department field plot data and tested against independent long-term growth and yield records.