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Brutian pine (Pinus brutia Ten.) is the most widespread conifer species in the Eastern Mediterranean. Aboveground biomass equations for small diameter brutian pine trees are needed for accurate fuel inventory and to assess carbon sequestration potential. In this study, we developed tree biomass models based on 143 brutian pine saplings measured in 11 research plots. Aboveground biomass (AGB) was modeled with a nonlinear mixed effects model which accounted for the variability among plots. The predicted total AGB was then distributed into foliage, branch and stem components. The Beta, Dirichlet, and multinomial logistic regressions were unbiased in their estimates of biomass component proportions. The Dirichlet regression has the advantage of an additive property and does not require non-standard data.

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This review article provides an overview of decision-making processes for harvesting of wood based forest products, which should include criteria that are environmentally friendly, technically feasible, economically viable, socially and institutionally acceptable. The decision-making on wood harvesting is a complex task that requires supporting management strategies for, not only satisfy socioeconomic expectations but also handle environmental considerations. The changing paradigms and developing technologies related to forestry have a significantly impact on the contents of the decisions. In order to measure and evaluate the effectiveness of the decisions, it is necessary to analyze the issues taken into consideration and focused in decision making processes. The aim of the article was to demonstrate the state-of-the-art of the decision making processes in Turkish forestry and review the contents of decisions in terms of adaptation to changing forestry operations management and technologies. Depending on the current status, the decision process related to wood harvesting system was firstly divided into two sub-process as managerial (administrative) and operational (technical), and then, each process was separately analyzed. To analyze managerial process in forest administrations, it was used a job analysis method by following of hierarchical and ordinary the paperwork procedure. For analysis of operational process, process mapping and work flowcharts were used by means of work study methods belonging to previous researches. It was found that the decisions were economical oriented (budget balanced) and societal sophisticated in administrative process. In the operational step, the harvest operations were based on technical and economic completion with basic and to moderate technologies. Environmental issues were not completely prioritized as a primary subject in any of the decision-making processes, yet.