Ramazan ÖZÇELİK, Hasan ALKAN, Onur ALKAN

Dikili ağaçların hacim tahmini için bazı metotların karşılaştırılması

Hacim tahmini, büyüme ve hasılat modellerinin en önemli parçalarından birisidir. Bu nedenle, ağaç hacimlerinin gereceğe yakın bir şekilde tahmini için güvenilir metotlara ihtiyaç vardır. Ancak halen kullanılmakta olan ağaç hacim tabloları ve gövde çapı modelleri gibi tahmin yöntemlerinin herhangi bir alanda kullanımadan önce uygunluğunun test edilmesi gerekmektedir. Bu, masraflı ve zaman gerektiren bir işlemdir. Bu çalışmanın amacı; ağaç hacim tablosu ve gövde çapı modeli ile elde edilen hacimleri, daha genel metotlar olan Centroid, Paracone ve Hossfeld yöntemleri ile elde edilen hacimlerle karşılaştırmak ve hangi metodun daha doğru sonuçlar verdiğini ortaya koymaktır. Bu amaçla, 292 adet kızılçam ağacı kesilmiş, bu ağaçlar üzerinde 1 m aralıkla çaplar ölçülmüş ve bu çaplar yardımıyla örnek ağaçların gerçek hacmi olarak kabul edilecek değerler hesaplanmıştır. İkinci aşamada, ağaç hacim tablosu, gövde çapı modeli, Centroid, Paracone ve Hossfeld yöntemleri ile ağaçların hacmi tahmin edilmiş ve gerçek hacim değerleri ile karşılaştırılmıştır. Sonuç olarak, Paracone, Centroid ve Hossfeld metotlarının yanlı sonuçlar üretmesine karşın, daha düşük tolerans aralığı (TA) ve hata kareler ortalaması (MSE) değerleri ortaya koyması nedeniyle hacim tablosu ve gövde çapı modeline tercih edilebileceği görülmüştür. Ancak, envanterin önemi ve maliyeti gibi kriterler dikkate alındığında, ağaç hacim tahminleri için hangi metodun kullanılacağına karar verecek olan uygulayıcıdır.

Anahtar Kelimeler:

Hacim tahmini, Centroid, Paracone, Hossfeld, Hacim denklemi

Comparison of some methods for estimating volume of standing trees

Volume estimation is one of the most components of growth and yield models. There is a need to reliable and accurate methods to accurately determine the volume of trees. Current methods include the use of volume tables or taper models which should be tested for applicability before use in a stand. This can be costly and time consuming. The purpose of this paper was to compare the estimates made using accepted volume table and taper model and the more generic methods as Centroid, Paracone, and Hossfeld and determine which gives the best results. For this aim, 292 brutian pine trees were harvested, diameter measurements were taken every 1 m and then these measurements were used to calculate the true volumes of each tree. The appropriate tree volume tables and taper model for brutian pine trees and Centroid, Paracone, and Hossfeld methods were used to estimate the tree volumes and these estimates were compared with true volumes. Overall, the Paracone, Centroid, and Hossfeld methods performed well in comparison with the other techniques but results generally were significantly biased, although these biases were small. Precision was better for the Paracone and Centroid methods than the other methods. In determining the method to apply for estimating the volume of the trees in filed, the forester will have to decide whether which method to use.

Keywords:

Volume estimation, Centroid, Paracone, Hossfeld, Volume equation,

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