Volumetric models for Eucalyptus grandis x urophylla in a crop-livestock-forest integration (CLFI) system in the Brazilian cerrado

Abstract

The influence of the forest component in the crop-livestock-forest integration system depends on several factors, among which are the plant species used and the row spacing established in system deployment. Therefore, the objective of this study was to characterize the tree component dendrometrically using Eucalyptus grandis x urograndis individuals from the CLFI system and to determine the model fit with volumetric models of homogeneous stands. The study area consists of a six year old CLFI system of Eucalyptus grandis x urophylla, located at the municipality of Cachoeira Dourada-GO. Forest inventory and volume measurement were carried out through the Smalian method. The hypsometric relations of Eucalyptus urograndis were adjusted to seven volumetric models. The arrangement proposed in the crop-livestock-forest integration system (CLFI) was efficient. The models tested (Näslund, Ogaya, Schumacher & Hall, Spurr logarithmic, Honner, Takata and Husch) showed adjustments above 87%, where the models Näslund (99.53%) and Ogaya (99.17%) had the best fit.

Modeling the individual height and volume of two integrated crop-livestock-forest systems of <i>Eucalyptus</i> spp. in the Brazilian Savannah

“…In a study of the hybrid Eucalyptus urograndis in the State of Goiás, Brazil, the authors tested four volumetric models and found adjusted coefficients of determination with variations from 0.9561 to 0.9890 (Venturoli & Morales, 2014). The data also corroborated the findings of Lemos-Junior et al (2016), who tested 8 models and found coefficients of determination between 0.8793 and 0.9953. -200.3 -199.4 -189.0 19.55 Legend: βi = coefficients of models; R² = coefficient of determination; AIC = Akaike information criterion; AICC = corrected Akaike information criterion); BIC = Bayesian Information Criterion and Syx (%) = lower standard error of estimate in percentage.…”

“…Venturolli ( 2014) studied the volumetry of a hybrid of Eucalyptus grandis x E. urophylla in the Cerrado and observed that the four models studied presented a correction of data superior to 95%, which stood out like the model of Takata (R 2 = 0.96). In a study of Eucalyptus grandis x urophylla in a 6-year-old crop-livestock-forest integration system in the city of Cachoeira Dourada, Goiás State, using several nonlinear growth models, the Takata model presented a 99% adjustment (Lemos-Junior et al, 2016).…”

Comparação de métodos para estimativas volumétricas em diferentes espécies de pinus plantadas no Mato Grosso do Sul

“…presentes no fuste do híbrido. Resultados semelhantes foram encontrados porLemos-Junior et al (2016), ao constar que o modelo de Naslund foi o mais acurado ao estimar o volume em um plantio clonal de Eucalyptus grandis x urophylla situado em um sistema de integração lavoura-pecuária-floresta.Avaliação da Eficiente e Precisão dos Métodos de Estimativa de VolumeNa Tabela 7 são apresentados o volume individual por espécie, calculados por meio dos métodos de estimativa citados anteriormente. No geral, nota-se que os métodos menos complexos e de fácil usabilidade como os fatores de forma artificial e natural, quociente de forma natural e o método dos dois diâmetros, apresentaram resultados poucos satisfatórios, com tendência em superestimar e/ou subestimar o volume real.…”