Principle and Application of Automatic Accurate Measurement of Stem Volume by Using Electronic Theodolite

Abstract

Abstract: Measuring tree volume by hewing down is a destructive experiment which costs many financial and material resources.In practice,stumpage measuremental method can avoid the forest’s damage,but being limited to the instrument environment,accuracy and large amount of work.This paper proposed a new measurement on stem volume by using electronic theodolite.In this study,202 larch trees in the stands of Experimental Forest Farm of Wangyedian,Harqin Banner,Chifeng City,Inner Mongolia Autonomous Region,were measured in high precision with their DBH,ground diameter,and tree height data using the related software.In addition,180 larch trees were selected for establishing the best fitted unigram volume model and binary volume model by using empirical equation.The volumes of the rest 22 larch trees were calculated by the equation for comparing.The results indicated that the volume was very close by using electronic theodolite and traditional empirical formula,which means that the new method of using electronic theodolite to calculate stem volume of trees could substitute the traditional method of calculating stem volumes by cutting them down.

Key words: electronic theodolite, DBH, stem volume, measurement accuracy, two-factor volume table

CLC Number:

S24
S758

SUN Mengying, FENG Zhongke, YAN Fei, MA Suliya, FAN Zhongmou, ZHENG Jun. Principle and Application of Automatic Accurate Measurement of Stem Volume by Using Electronic Theodolite[J]. FOREST RESOURCES WANAGEMENT, 2013, (5): 80-84.

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