Establishment of Compatible Tree Volume Equation Systems of Chinese Fir

• Published in: Forest research (Beijing) Vol. 27; no. 1
• Main Author: Zeng, Wei-sheng
• Format: Journal Article
• Language: Chinese
• Published: 01.01.2014
• ISSN: 1001-1498

Taking Chinese fir( Cunninghamia lanceolata),the most important coniferous species in southern China,as the study object,the compatible two-entry and single-entry( diameter at breast height-DBH,and diameter at root collar-DRC) volume equations,height-DBH regression model,and DRC-DBH regression model were established using the error-in-variable simultaneous equation approach. Based on the three height-DBH models and two DRC-DBH models,four compatible volume equation systems were established simultaneously,which were compared with six statistics. The results show that the compatible volume equation system composed of simple height-DBH model and DRC-DBH model is quite sound,the mean prediction error( MPE) of two-entry volume equation is 1. 31% and the MPE's of single-entry equations based on DBH and DRC are 3. 66% and 7. 39%,respectively. The tree volume equations developed in this paper can be applied for volume estimation of Chinese fir forests under different circumstances.