Yield Models of Pure Fir (Abies nordmanniana S. subsp. bornmülleriana (Mattf.)) Stands (Western Black Sea Region)

Abstract

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