Year 2017, Volume 67, Issue 2, Pages 243 - 261 2017-07-01

Bucak Yöresi doğal sedir ve Toros göknarı karışık meşcereleri için gövde çapı ve hacim modelleri
Individual taper models for natural cedar and Taurus fir mixed stands of Bucak Region, Turkey

Ramazan Özçelik [1] , Osman Dirican [2]

325 448

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

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

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Subjects Science
Journal Section Research Articles (Araştırma Makalesi)
Authors

Author: Ramazan Özçelik
Institution: SÜLEYMAN DEMİREL ÜNİVERSİTESİ, ORMAN FAKÜLTESİ
Country: Turkey


Author: Osman Dirican
Institution: SÜLEYMAN DEMİREL ÜNİVERSİTESİ, FEN BİLİMLERİ ENSTİTÜSÜ
Country: Turkey


Dates

Publication Date: July 1, 2017

Bibtex @research article { jffiu290845, journal = {Journal of the Faculty of Forestry Istanbul University}, issn = {0535-8418}, eissn = {1309-6257}, address = {İstanbul University-Cerrahpaşa}, year = {2017}, volume = {67}, pages = {243 - 261}, doi = {10.17099/jffiu.290845}, title = {Individual taper models for natural cedar and Taurus fir mixed stands of Bucak Region, Turkey}, key = {cite}, author = {Özçelik, Ramazan and Dirican, Osman} }
APA 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), 243-261. DOI: 10.17099/jffiu.290845
MLA Özçelik, R , Dirican, O . "Individual taper models for natural cedar and Taurus fir mixed stands of Bucak Region, Turkey". Journal of the Faculty of Forestry Istanbul University 67 (2017): 243-261 <http://dergipark.org.tr/jffiu/issue/28363/290845>
Chicago Özçelik, R , Dirican, O . "Individual taper models for natural cedar and Taurus fir mixed stands of Bucak Region, Turkey". Journal of the Faculty of Forestry Istanbul University 67 (2017): 243-261
RIS TY - JOUR T1 - Individual taper models for natural cedar and Taurus fir mixed stands of Bucak Region, Turkey AU - Ramazan Özçelik , Osman Dirican Y1 - 2017 PY - 2017 N1 - doi: 10.17099/jffiu.290845 DO - 10.17099/jffiu.290845 T2 - Journal of the Faculty of Forestry Istanbul University JF - Journal JO - JOR SP - 243 EP - 261 VL - 67 IS - 2 SN - 0535-8418-1309-6257 M3 - doi: 10.17099/jffiu.290845 UR - https://doi.org/10.17099/jffiu.290845 Y2 - 2017 ER -
EndNote %0 Journal of the Faculty of Forestry Istanbul University Individual taper models for natural cedar and Taurus fir mixed stands of Bucak Region, Turkey %A Ramazan Özçelik , Osman Dirican %T Individual taper models for natural cedar and Taurus fir mixed stands of Bucak Region, Turkey %D 2017 %J Journal of the Faculty of Forestry Istanbul University %P 0535-8418-1309-6257 %V 67 %N 2 %R doi: 10.17099/jffiu.290845 %U 10.17099/jffiu.290845
ISNAD Özçelik, Ramazan , Dirican, Osman . "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 (July 2017): 243-261. https://doi.org/10.17099/jffiu.290845
AMA Özçelik R , Dirican O . Individual taper models for natural cedar and Taurus fir mixed stands of Bucak Region, Turkey. J FAC FOR ISTANBUL U. 2017; 67(2): 243-261.
Vancouver Özçelik R , Dirican O . Individual taper models for natural cedar and Taurus fir mixed stands of Bucak Region, Turkey. Journal of the Faculty of Forestry Istanbul University. 2017; 67(2): 261-243.