Individual taper models for natural cedar and Taurus fir mixed stands of Bucak Region, Turkey

Year 2017, Volume: 67 Issue: 2, 243 - 261, 01.07.2017

Ramazan Özçelik , Osman Dirican

https://doi.org/10.17099/jffiu.290845

Abstract

Abstract: In this study, we assessed the performance of different types of taper equations for predicting tree diameters at specific heights and total stem volumes for mixed stands of Taurus cedar (Cedrus libani A. Rich.) and Taurus fir (Abies cilicica Carr.). We used data from mixed stands containing a total of 131 cedar and 124 Taurus fir trees. We evaluated six commonly used and well-known forestry taper functions developed by a variety of researchers (Biging (1984), Zakrzewski (1999), Muhairwe (1999), Fang et al. (2000), Kozak (2004), and Sharma and Zhang (2004)). To address problems related to autocorrelation and multicollinearity in the hierarchical data associated with the construction of taper models, we used appropriate statistical procedures for the model fitting. We compared model performances based on the analysis of three goodness-of-fit statistics and found the compatible segmented model of Fang et al. (2000) to be superior in describing the stem profile and stem volume of both tree species in mixed stands. The equation used by Zakrzewski (1999) exhibited the poorest fitting results of the three taper equations. In general, we found segmented taper equations to provide more accurate predictions than variable-form models for both tree species. Results from the non-linear extra sum of squares method indicate that stem tapers differ among tree species in mixed stands. Therefore, a different taper function should be used for each tree species in mixed stands in the Bucak district. Using individual-specific taper equations yields more robust estimations and, therefore, will enhance the prediction accuracy of diameters at different heights and volumes in mixed stands.

Keywords: Segmented model, compatible equation, stem form, merchantable volume, autocorrelation, F- test

Received (Geliş): 08.02.2017 - Revised (Düzeltme): 17.03.2017 -   Accepted (Kabul): 28.04.2017

Cite (Atıf): Özçelik, R., Dirican, O., 2017. Individual taper models for natural cedar and Taurus fir mixed stands of Bucak Region, Turkey. Journal of the Faculty of Forestry Istanbul University 67(2): 336-354. DOI: 10.17099/jffiu.290845

Keywords

Karışık meşcere, Gövde çapı, ticari hacim, otokorelasyon, F testi

Bucak Yöresi doğal sedir ve Toros göknarı karışık meşcereleri için gövde çapı ve hacim modelleri

Abstract

Özet: Çalışmada, Bucak Yöresi doğal karışık sedir (Cedrus libani A. Rich.) ve Toros göknarı (Abies cilicica Carr.) meşcereleri için gövde çapı modelleri geliştirilmiştir. Bu amaçla sedir ve Toros göknarı karışık meşcerelerinden, 131 adet sedir 124 adet Toros göknarı ölçülmüştür. Çalışmada, ormancılıkta yaygın olarak kullanılan Biging (1984), Zakrzewski (1999), Muhairwe (1999), Fang ve ark. (2000), Sharma ve Zhang (2004) ve Kozak (2004)’ın modelleri test edilmiştir. Modellerinin geliştirilmesinde, hiyerarşik verilerdeki çoklu bağıntı ve otokorelasyon problemlerini de dikkate alan uygun istatistiksel yöntemler kullanılmıştır. Geliştirilen gövde çapı denklemlerinin tahmin performanslarının değerlendirilmesinde, üç farklı ölçüt kullanılmıştır. Karışımdaki her iki tür için de, Fang ve ark. (2000) tarafından geliştirilen uyumlu gövde çapı modelinin, çap, ticari boy, ticari hacim ve toplam gövde hacmi tahminlerinde, diğer modellerden daha başarılı olduğu görülmüştür. Zakrzewski (1999)’nin modeli ise diğer modellerle karşılaştırıldığında, her iki tür için de en başarısız modeldir. Karışımı oluşturan sedir ve göknar türleri için ayrı gövde çapı ve hacim modeline ihtiyaç olup olmadığı F-testi ile ortaya konmuştur. Yapılan değerlendirmelerde, sedir ve göknar türleri için farklı çap ve hacim denklemlerinin kullanılması gerektiği ortaya çıkmıştır. Geliştirilen gövde çapı modelleri ile Bucak Yöresi karışık sedir ve göknar meşcerelerindeki ağaç türleri için daha doğru çap ve hacim tahminleri yapılabilmesi mümkündür.    

Anahtar Kelimeler: Parçalı model, uyumlu denklem, gövde formu, ticari hacim, otokorelasyon, F testi

Received (Geliş): 08.02.2017 - Revised (Düzeltme): 17.03.2017 -   Accepted (Kabul): 28.04.2017

Cite (Atıf): Özçelik, R., Dirican, O., 2017. Individual taper models for natural cedar and Taurus fir mixed stands of Bucak Region, Turkey. Journal of the Faculty of Forestry Istanbul University 67(2): 336-354. DOI: 10.17099/jffiu.290845

Keywords

Karışık meşcere, Gövde çapı, ticari hacim, otokorelasyon, F testi

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