Modeling Diameter Distributions by Using Weibull Function in Forests Located Kestel-Bursa
Öz
Detailed data
about forest stands are needed for economic and silvicultural interpretation of
forest enterprises for a long time. Diameter distribution models (DDMs) allow
to predict number of trees, basal area and stand volume at level of diameter
classes. So, both effects of silvicultural treatments on forest stands and
economic analysis of forest enterprise can be made with more details. In this
study, diameter distributions were predicted by three-parameter Weibull
function. The parameters of the Weibull function were predicted by maximum
likelihood and percentile-based methods. According to the comparison based on
Reynold’s error index, the method based on 31th and 63rd
percentiles with an average success order of 2.61 was assessed as the most
successful in prediction of parameters of the Weibull function. The eligible of
the predicted distribution by the most successful method for the observed
distribution was tested by Kolmogorov-Simirnov analyze, and the results showed
that the Weibull function was suitable for 305 of total 312 sample plots.
Anahtar Kelimeler
Diameter distribution,3-parameter Weibull,probability density function,stand structure
Kaynakça
- Akalp T. 1982. Simulasyon tekniği ve meşcere modelleri. Journal of the Faculty of Forestry Istanbul University, 32(1), 166-172.
- Bliss C.I., Reinker K.A. 1964. A lognormal approach to diameter distributions in even-aged stands. Forest Science, 10(3), 350-360.
- Bolat F. 2015. Bursa-Kestel Orman İşletme Şefliği içerisindeki meşcereler için çap dağılım modellerinin geliştirilmesi. Yüksek Lisans Tezi, ÇKÜ Fen Bilimleri Enstitüsü, 77 s. Çankırı.
- Borders B.E., Souter R.A., Bailey R.L., Ware K.D. 1987. Percentile based distributions characterize forest tables. Forest Science, 33(2), 570-576.
- Clutter J.L., Bennet F.A. 1965. Diameter distributions in old-field slash pine plantation. Georgia Forest Research Council, Report No: 13, 9p. USA.
- Ercanlı İ., Yavuz H. 2010. Doğu ladini (Picea Orientalis (L.) Link)-Sarıçam (Pinus Sylvestris L.) karışık meşcerelerinde çap dağılımlarının olasılık yoğunluk fonksiyonları ile belirlenmesi. Kastamonu Orman Fakültesi Dergisi, 10(1), 68-83.
- Ercanlı İ., Bolat F., Kahriman A. 2013. Comparing parameter recovery methods for diameter distribution models of Oriental spruce (Picea orientalis (L.) Link.) and Scotch pine (Pinus sylvestris L.) mixed stands located Trabzon and Giresun Forest Regional Directorate. International Caucasian Forestry Symposium (24-26 October), 119-126, Artvin, Turkey.
- Frazier J.R. 1981. Compatible whole-stand and diameter distribution models for Loblolly pine plantations. PhD thesis, Virginia Polytechnic Institute and State University, 125 p. Blacksburg.
- Gorgoso-Varela J.J. 2015. Comparison of estimation methods for fitting Weibull distribution to the natural stand of Oluwa forest reserve, Onda State, Nigeria. Journal of Research in Forestry, Wildlife and Environment, 7(2), 81-90.
- Johnson N.L. 1949. System of frequency curves generated by methods of translation. Biometrika, 36(1/2), 149-176.