STRUCTURE OF THE DIAMETER DISTRIBUTION OF AN EXPERIMENTAL PLANTATION OF CANDEIA (<i>Eremanthus erythropappus </i>(DC.) MacLeish)
DOI:
https://doi.org/10.5902/1980509816618Keywords:
prognosis, probability density function, forest management.Abstract
http://dx.doi.org/10.5902/1980509816618
The present study had as its main objective to characterize the diameter distribution of an experimental plantation of ‘candeia’ trees submitted to different treatments (age, spacing and silvicultural treatments), by adjusting several probability density functions. Subsequently, a prognosis of the selected function parameters in relation to age was conducted. The probability density functions tested were: Gamma, Normal, Log-normal,2-parameter Weibull (2P) and 3-parameter Weibull (3P) for the different study groups. The selection of the best fit was based on the Kolmogorov-Smirnov test with a probability of 95%. The Weibull 3P function present the best fits for the majority of the treatments, especially for pruned trees, being thus chosen for the prognosis of the parameters according to age. It was detected that pruning affected the scale parameters, but not the shape parameters, while spacing did not influence the function parameters in a significant manner. Hence, linear equations were adjusted for the prognosis of the parameters in relation to age. A simulation was conducted considering pruned and not pruned trees in order to evaluate the behavior of the diametric distribution in relation to the plantation age, in which it was found that the parameterized equations satisfactorily distinguished between the pruned and not pruned ‘candeia’ plantations
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References
ARCE, J. E. Modelagem da estrutura de florestas clonais de Populus deltoides Marsh. através de distribuições diamétricas probabilísticas. CiênciaFlorestal, Santa Maria, v. 14, n. 1, p. 149 - 164, 2004.
BAILEY. R.L.; DELL, J.R. - Quantifying diameter distributions with the Weibull function. Forest Science, v. 19, p. 97 - 104, 1973.
BINOTI, D. H. B. et al.Uso da função weibull de três parâmetros em um modelo de distribuição diamétrica para plantios de eucalipto submetidos a desbaste.R. Árvore, Viçosa-MG, v.34, n.1, p.147-156, 2010.
BLANCO JORGE, L. A.; VEIGA, R. A. de A.; PONTINHA, A. de A. S. A função Weibull no estudo de distribuições diamétricas em povoamento de Pinus elliottii na estação experimental de Itapeva. IPEF, n.43/44, p.54-60, 1990.
CAMPOS, J. C. C.; LEITE, H.G. Mensuração florestal: perguntas e respostas. 2.ed. Viçosa, MG. Editora UFV, 2006. 407p.
CAO, Q. V. Predicting parameters of Weibull function for modeling diameter distribution. Forest Science, v. 50, p. 682 - 685, 2004.
GADOW, K.V. Fitting distributions in Pinuspatula stands. South African Forestry Journal.Pretoria, n.126, p. 20 – 29, 1983.
HOAGLIN, D. C.; MOSTELLER, F.; TUKEY, J. W. Understanding robust and exploratory data analysis, New York: John Wiley & Sons, 1983. 447 p.
LOETSCH, F.; ZÖHRER, F.; HALLER, K.E. Forest Inventory. München: BLV Verlagsgesellschaft mbH, 1973. 469 p.
McGEE, C. E.; DELLA-BIANCA, L. Diameter distributions in natural yellow-poplar stands.USDA Forest Service Research Paper SE-25, 7 p. Southeast Forest ExpStn, Asheville, NC. 1967.
MIGUEL, E. P.et al.Using the Weibull function for prognosis of yield by diameter class in Eucalyptus urophylla stands. R. Cerne, Lavras, v. 16, n.1, p. 94-104, 2010.
PÉREZ, J.F.M. Sistema de manejo para candeia (Eremanthuserythropappus (DC.) MacLeish). Lavras: UFLA, 2001. 71f. Dissertação (Mestrado em Engenharia Florestal) Universidade Federal de Lavras, Lavras, MG. 2001.
PETRÁŠ, R.; MECKO, J.; NOCIAR, V. Diameter structure of the stands of poplar clones.Journal of Forest Science, v. 56, p. 165 - 170, 2010.
REYNOLDS, M. R.; BURK, T. E.; HUANG, W. C. Goodness-of-fit tests and model selection procedures for diameter distribution models.Forest Science, v. 34, p. 373 - 399, 1998.
SCOLFORO, J. R. S. Biometria Florestal: Modelos de Crescimento e Produção Florestal. Lavras: UFLA/FAEPE, 2006. 393 p.
SCOLFORO, J. R. S.et al.O manejo de plantações de candeia. Lavras: Editora UFLA, 2008. 27 p.
SILVA, C. P. C. Crescimento e produção florestal da candeia em plantio sujeito a diferentes espaçamentos e podas. Lavras: UFLA, 2009, 131 f. Dissertação (Mestrado em Engenharia Florestal). 2009.
STATGRAPHICS Centurion XV.StatPoint Technologies Inc., Warrenton, VA, USA.2005
