Batı Akdeniz Yöresi doğal sedir meşcereleri için hacim denklemleri

Year 2017, Volume: 18 Issue: 1, 37 - 48, 27.02.2017

Ramazan Özçelik , Meryem Çevlik

https://doi.org/10.18182/tjf.270694

Cited By: 7

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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