Height-diameter model for natural black pine stands in Eğirdir region: Quantile regression approach

Black pine (Pinus nigra JF Arnold.) is one of the most economically and ecologically important tree species in Turkey. In this context, reliable accurate information about current status, growth yield characteristics these forests needed for sustainable management black forests. One components models height-diameter relationships. Diameter height variables are also measurement tools forest inventory studies. Since a standing cannot be measured as easily breast diameter, often estimated function diameter For reason, estimation has great importance forestry activity. study, model was developed natural stands Eğirdir region using Quantile Regression (QR) techniques. The data were randomly divided into two equal groups. Chapman-Richards chosen base both methods since been provided successful results previous QR based on three quantile (3, 5 9 quantiles) sets study. advantage approach over other that allows calibration with extra sample heights. purpose, different alternatives tested number trees ranging from 1 to 10 each plot. As result it seen 3QR performed better than 5QR 9QR approaches terms describing addition, determined five plot appropriate precision sampling costs