Batı Akdeniz Yöresi doğal sedir meşcereleri için hacim denklemleri

Abstract

Toros sediri (Cedrus libani A. Rich.) ülkemizin ekolojik ve ekonomik açıdan en önemli ağaç türlerinden birisidir. Bu nedenle, sedir ormanlarının bugün ve geleceğe dönük yönetim ve planlama stratejilerinin geliştirilmesinde, türün büyüme ve hasılatına ilişkin bilgilere ihtiyaç duyulmaktadır. Ormanların büyüme ve hasılatına ilişkin tahminlerde kullanılan en önemli yapı taşlarından birisi, ağaç hacim tahminleridir. Bu amaçla, çalışmada Batı Akdeniz Yöresi doğal Toros sediri meşcerelerinin hacim tahminleri için hacim denklemleri geliştirilmiştir. En uygun hacim denkleminin seçimi; model geliştirme ve test verileri için, altı farklı uygunluk ölçütü (uyum indeksi, ortalama hata, ortalama mutlak hata, maksimum mutlak hata, hata kareler ortalamasının karekökü ve Akaike bilgi kriteri) kullanılarak belirlenen model nisbi sıralamalarına göre gerçekleştirilmiştir. Model nisbi sıralarına göre, en başarılı hacim modelleri, Takata (1958) ve Schumacher ve Hall (1933)’dir. Ancak, yörede doğal sedir meşcerelerinde yapılacak ağaç hacim tahminleri için, yaygın olarak kullanılan ve nispeten daha kolay bir model olması nedeniyle, Schumacher-Hall (1933) hacim denklemi önerilmiştir.  

Keywords

• Sedir,Hacim denklemi,Göğüs çapı,Boy,Nisbi sıra

Volume equations for natural Taurus cedar stands in West Mediterranean Region

Abstract

Taurus cedar (Cedrus libani A. Rich.) is one of the most important tree species in Turkey. Therefore, the information is necessary about growth and yield of the species for developing future management and planning strategies. The one of the essential building blocks in forest growth and yield prediction models is the equations for estimating individual tree volume. In this study, tree volume equations were developed for Taurus cedar stands in West Mediterranean Region. The tested models were compared using six performance criteria (Fit index, average bias, average absolute residuals, absolute maximum bias, and Akaike Information criteria) for model development and validation dataset. According to relative ranks of models, the best volume equations are Takata (1958) and Schumacher-Hall (1933) for Taurus cedar. As a result, tree volume can be estimated with high precision using Schumacher-Hall (1933)’s equation for natural cedar stands in this region.

Keywords

• Taurus cedar,Volume equation,Diameter,Height,Relative rank

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