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BIOMASS EQUATIONS FOR CALABRIAN PINE IN THE MEDITERRANEAN REGION OF TURKEY MODELI BIOMASE STABALA KALABRIJSKOG BORA U MEDITERANSKOM PODRUČJU TURSKE Turan SÖNMEZ, Aydin KAHRIMAN, Abdurrahman ŞAHIN, Mehmet YAVUZ Summary The aim of this study was to develop allometric equations for the estimation of above-ground biomass components of Calabrian pine (Pinus brutia Ten.) tree in the Mediterranean Region of Turkey. Using regression analysis, different allometric equations were fitted for the tree components of the above-ground biomass using diameter at breast height (dbh) and tree height as estimators. Two hundred and ninety-two trees between 0.4 and 63.0 cm in dbh were randomly sampled throughout 292 natural, pure Calabrian pine stands in Turkey’s Mediterranean Region, where it forms diverse stand structures. Finally, the allometric equations were developed for the tree components of the Calabrian pine tree for the stem, bark, branch, needle and total above-ground biomass. The stem, bark and total biomass equations explained more than 90% of the observed variability, while the branch and needle biomass equations explained 82% and 65%, respectively. KEY WORDS: Calabrian pine, biomass estimation, allometric equations INTRODUCTION UVOD Tree biomass estimation is needed for both forest resource planning and for energy studies (Zianis et al., 2005). Estimating forest biomass can be achieved through the use of empirical allometric equations that relate several tree parameters, such as tree diameter, tree height, and crown depth (Zianis et al., 2011). Once developed, the equations can be conveniently applied to forest inventory datasets in order to obtain biomass estimates, usually for above-ground tree components at the forest stand level. These forest inventory datasets are used for biomass studies such as understanding of ecosystem material distribution, ecosystem dynamics and circulation, estimating forest carbon stock and annual carbon storage capacity, forest fire behavior, forest fire forecasting and determining bioenergy potential The Calabrian pine is one of the fast growing tree species in the Mediterranean area, prone to forest fire and has a big carbon storage capacity. The carbon stocks and carbon balance are calculated based on the distribution of plant mass (as tree species and their amount of dry weight) in the forested areas. Biomass equations can be applied directly to the tree-level inventory data (e.g. diameter and height), or biomass expansion factors (BEFs) (Lehtonen et al., 2004). Many forest biomass estimation studies have been conducted in the Mediterranean countries such as Lebonan, Syria and Turkey on above-ground biomass and include those implemented for Scots pine (Ugurlu et al., 1976), Calabrian pine (Sun et al., 1980; Durkaya et al., 2009), alder |