This study was conducted to compare volumes estimated from two taper functions and observed volumes of Chamaecyparis obtusa trees to evaluate accuracy and precision of centroid method. Centroid volume estimates were also compared with volume estimates from existing Forest Resources Evaluation and Prediction Program. The results of this study showed that Gregoire’s simple taper function produced unbiased volume estimates while the others were biased. Volume estimates from the Forest Resources Evaluation and Prediction Program were also biased when applied in the Jangseong National Forest regions. These results suggested that the centroid method could produce reliable stem volumes of trees when no other reliable stem volume equations exist.

ABSTRACT
 I. INTRODUCTION
 Ⅱ. MATERIAL AND METHODS
  Study Sites
  Centroid Method
  Taper Functions
 Ⅲ. Data Analysis
 Ⅳ. RESULTS AND DISCUSSION
 Ⅴ. ACKNOWLEDGEMENT
 Literature cited

• Young-Jin Lee(공주대학교 산림자원학과) | 이영진 Corresponding author
• Hyung-Ho Kim(경상대학교 환경산림과학부(농업생명과학연구원)) | 김형호