Establishment of Compatible Tree Volume Equation Systems of Chinese Fir

ZENG Wei-sheng

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.

1. Academy of Forest Inventory and Planning, State Forestry Administration, Beijing 100714, China

Received Date: 2013-02-25

Abstract: 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.

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Reference (23)

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Establishment of Compatible Tree Volume Equation Systems of Chinese Fir

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