ACCURACY OF OPTICAL DENDROMETERS FOR DETERMINING THE VOLUME OF STANDING TREES
DOI:
https://doi.org/10.5902/1980509818458Keywords:
optical dendrometers, measurement errors, non-destructive samplingAbstract
http://dx.doi.org/10.5902/1980509818458
The aim of this paper is to verify the accuracy of the optical dendrometers Criterion 400 and RC3H by studying the quality of measures of wood volume determination of standing trees through these dendrometers. The study was developed at the Experimental Station of Forest Sciences, in Itatinga, São Paulo state, which belongs to the University of São Paulo (ESALQ / USP). It was sampled a total of 175 trees in three plots of Eucalyptus grandis. The stem diameter of standing trees was measured by the two optical dendrometers at distances of 0.1, 0.4, 0.7, 1.0, 1.3, 2.0 meters from this point meter by meter along the stem up to 8 meters height. After measuring the standing trees they were felled and the diameter was obtained in different positions with a caliper and a tape in the same positions that the non-destructive measures were taken. With the diameters the volume was calculated by section and by individual trees by the Smalian formula for the comparison of methods. Analyzing the measurements of stem diameter and the individual tree volume realizes that the two dendrometers provided measures generally underestimated. However, the Criterion provided the best estimates. For the diameter and individual tree volume the Criterion showed underestimated errors averaging approximately 1 cm (10%), while the RC3H resulted in errors greater than 5 cm (30%) on average.Thus, when measuring observed variables in a non-destructive way with reliability and accuracy, the Criterion showed better results.
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References
ARNEY, D. J.; PAINE, D. P. Tree and stand volumes using heightac cumulation and telescopic Spiegel-relaskop. Forest Science, Washington, v. 18, n. 2, p. 159- 168, June 1972.
AVERY, T. E.; BURKHART, H. E. Forest measurements. 4th ed. New York: McGraw-Hill, 1997. 408 p. (McGraw-Hill series in forest resources).
CASTRO, T. N.; MONTEIRO, D. R.; BATISTA, J. L. F. Avaliação do aparelho Criterion 400 na cubagem rigorosa de árvores em pé. In: SIMPÓSIO INTERNACIONAL DE INICIAÇÃO CIENTÍFICA DA UNIVERSIDADE DE SÃO PAULO, 16., 2008, Piracicaba. Anais..., São Paulo, 2008.
CANALEZ, G. G.; CORTE, A. P. D.; SANQUETTA, C. R. Dinâmica da estrutura da comunidade de lauráceas no período 1995-2004 em uma floresta de araucária no sul do estado do Paraná, Brasil. Ciência Florestal, Santa Maria, v. 16, n. 4, p. 357-367, 2006.
CARR, W. Use of laser technology for tree measurement – present use and future development. Paper presented at Modern methods of estimating tree and log volume and increment. In: CONFERENCE AND WORKSHOP (IUFRO S4.02).June 14-16, West Virginia University, Morgantown, WV, USA.8 p. 1993.
CLARK, N. A.; WYNNE, R. H.; SCHMOLDT, D. L. A review of past research on dendrometers. Forest Science. Washington, v. 46, n. 4, p. 570-576. 2000.
COUTO, H. T. Z.; BASTOS, N. L. M. "Erros na medição de altura em povoamentos de Eucalyptus em região planta". IPEF, Piracicaba, n. 39, p. 21-31, 1988.
COUTO, H. T. Z.; BATISTA, J. L. F.; RODRIGUES, L. C. E. "Mensuração e gerenciamento de pequenas florestas". Documentos florestais, Piracicaba, n. 5, p. 1-37, 1989.
DITUNO, E. Criterion model 400 use for strip cruising. Washington. Forest Service. 1993.
EFRON, B.; TIBSHIRANI, R. J. An introduction to the bootstrap. New York: Chapman & Hall, 1993. 436 p.
FERGUSON, I. S. et al. Calibrating dendrometersdor estimating tree volumes. Australian Forest Research. Canberra. v. 14, p. 253-263. 2000.
FREITAS, A. G.; WICHERT, M. C. P. Comparação entre instrumentos tradicionais de medição de diâmetro e altura com o Criterion 400. IPEF, Circular Técnica, Piracicaba, n. 188, p. 1-7, 1998.
KALLIOVIRTA, J.; LAASASENAHO, J.; KANGAS, A. Evaluation of the Laser-relascope. Forest Ecologyand Management. Amsterdam, v. 20, p. 181-194, 2005.
LEITE, L. R. C. Uso do estimador de razão generalizado na condução do inventário florestal. Campo Grande/MS: 2007, Dissertação de Mestrado em Agronegócios. UFMS – UNB – UFG.
LIU, C. J.; HUANG, X.; EICHEMBERGER, J. K. Using laser technology for measuring trees. Paper presented at Modern Methods of estimating tree and log volume and increment conference and worshop (IUFRO S4.02). Junho 14-16, West Virginia University, Morgantown, WV, USA. 1993. 13p.
MACHADO, S. A.; FIGUEIREDO FILHO, A. Dendrometria. 2. ed. Guarapuava: Unicentro, 2006. 316 p.
PARKER, R. C. Nondestructive Sampling Applications of the Tele-Relaskop in Forest Inventory. Southern Journal of Applied Forestry. Washington., v. 21, n. 2, p. 75-83, 1997.
PARKEY, R. C.; MARTNEY, T. G. Comparison of Optical Dendrometers for Prediction of Standing Tree Volume. Southern Journal of Applied Forestry. Oklahoma, v. 23, n. 2, p. 407-417, 1998.
R DEVELOPMENT CORE TEAM (2011). R: A language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria. ISBN 3-900051-07-0, URL http://www.R-project.org. Acessoem 27 de julho de 2011.
WILLIAMS, M. S. et al. Evaluation of the Barr & Stroud FP15 and Criterion 400 Laser Dendrometers for Measuring Upper Stem Diameters and Heights. Forest Science. Washington, v. 45, n. 1, p. 53-61. 1999.
