Nonlinear mixed-effect models for height-diameter relationships of oriental beech trees in Artvin region, Eastern Black Sea Region of Türkiye

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dc.authorid0000-0002-9435-9844
dc.contributor.authorŞahin, Abdurrahman
dc.date.accessioned2025-09-30T08:54:05Z
dc.date.available2025-09-30T08:54:05Z
dc.date.issued2025
dc.departmentAÇÜ, Orman Fakültesi, Orman Mühendisliği Bölümü
dc.description.abstractResearch on site quality, volume estimation, growth and yield analysis, and other related topics relies heavily on tree and stand height as a key metric. This study evaluates three types of 36 nonlinear height-diameter models, categorized as simple, fixed-effects and generalized mixed-effects for accurately predicting total tree height using independent data from even-aged natural stands of oriental beech in northeastern Türkiye. The dataset comprised 1,355 height-diameter measurement pairs, obtained from 33 randomly selected temporary plots. To examine variations in the height-diameter relationship across different zones (regions) and developmental ages of oriental beech, nonlinear mixed-effects (NLME) modeling was employed. The Crecente-Campo height-diameter model, which explained 90% of the variance in the height-diameter relationship, was identified as the most effective. A significant difference we observed between the predicted and actual tree heights in the height-diameter model developed using nonlinear regression modeling (NLRM). However, this discrepancy was reduced following the application of the NLME procedure to the model. The results indicated that the application of the NLME approach increased the FI value by 3%, while reducing the AAE, RMSE, and Bias by 16–54%.
dc.identifier.doi10.1080/02827581.2025.2533378
dc.identifier.issn02827581
dc.identifier.scopus2-s2.0-105012228928
dc.identifier.scopusqualityQ2
dc.identifier.urihttps://hdl.handle.net/11494/5915
dc.identifier.wosWOS:001538940100001
dc.identifier.wosqualityQ2
dc.indekslendigikaynakScopus
dc.indekslendigikaynakWeb of Science
dc.institutionauthorŞahin, Abdurrahman
dc.institutionauthorid0000-0002-9435-9844
dc.language.isoen
dc.publisherTaylor and Francis A.S.
dc.relation.ispartofScandinavian Journal of Forest Research
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/embargoedAccess
dc.subjectMixed-effects modeling
dc.subjectOriental beech
dc.subjectRandom effects
dc.subjectTree height-diameter models
dc.titleNonlinear mixed-effect models for height-diameter relationships of oriental beech trees in Artvin region, Eastern Black Sea Region of Türkiye
dc.typeArticle

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