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    Height-diameter allometry of two commercial pine species located in low productive forest stands of northwestern Türkiye
    (Osterreichischer Agrarverlag GmbH, 2022) Seki, M.
    Tree height is one of the most important variables in estimating growing stock volume, carbon stock, site quality, tree growth and yield. Because measurement of tree height is labor-intensive and time consuming, height-diameter models are generally used for height estimates. In this study, twenty existing nonlinear height-diameter models were fitted and evaluated for Calabrian pine (Pinus brutia Ten.) and Crimean pine (Pinus nigra J.F. Arnold subsp. pallasiana (Lamb.) Holmboe) in the Cemaller region, northwestern Türkiye. The best results were obtained with the 3-parameter logistic type model for both species, accounting for about the 79% and 84% of the total variance in height-diameter relationships of Calabrian pine and Crimean pine, respectively. The fitted simple height-diameter models with diameter at breast height as an independent variable can now be used to estimate total tree heights for both species. As a side result, there was significant difference in height-diameter relationship between the two species. The height-diameter models developed in this study can provide accurate height estimates for growth and yield assessment, when tree height measurements are not available and the height-diameter relations of the target region as in this study region. © 2022 Osterreichischer Agrarverlag GmbH. All rights reserved.