scholarly journals Produção de biomassa de Eucalyptus grandis Hill ex. Maiden em diferentes arranjos de espaçamentos de plantio simples e duplos

2019 ◽  
Vol 29 (4) ◽  
pp. 1568
Author(s):  
Felipe De Córdova Machado ◽  
Humberto De Jesus Eufrade-Junior ◽  
Grasiela Spada ◽  
Guilherme Oguri ◽  
Éder Aparecido Garcia ◽  
...  
Keyword(s):  
Eucalyptus Grandis ◽  
G 21

O objetivo deste trabalho foi avaliar o efeito dos espaçamentos de plantio em linhas simples e duplas na área basal, volume de madeira com casca por hectare, densidade básica do tronco e biomassa arbórea de Eucalyptus grandis Hill ex Maiden (clone G-21) manejado no sistema de curta rotação. O ensaio foi composto por quatro espaçamentos de plantio: 3,0 m × 1,0 m × 2,0 m (linha dupla), 3,0 m × 1,0 m (linha simples), 3,0 m × 1,0 m × 1,0 m (linha dupla) e 3,0 m × 0,5 m (linha simples), sendo avaliado aos 12 meses e 24 meses após o plantio. As principais diferenças significativas foram encontradas no segundo período de avaliação para os fatores de variação considerados – espaçamento e idade. A área basal aumentou com o adensamento das florestas, embora o volume não tenha seguido a mesma tendência aos 24 meses de plantio. A densidade básica aumentou com a idade apenas nos espaçamentos simples. No estudo da alocação de biomassa nos diferentes compartimentos da árvore, verificou-se uma maior proporção de biomassa de tronco com a idade, bem como nos espaçamentos mais adensados. Uma das maiores produções florestais (65 Mg ha-1) foi encontrada no espaçamento 3,0 m × 1,0 m aos 24 meses de idade.

Variation of Soil Fauna Community in Eucalyptus grandis Plantation Before and After Felling Disturbance*

2011 ◽  
Vol 17 (1) ◽  
pp. 73-77
Author(s):  
Jiujin XIAO ◽  
Jian ZHANG ◽  
Yumei HUANG ◽  
Hongxing MA ◽  
Xudong LI
Keyword(s):  
Soil Fauna ◽  
Eucalyptus Grandis ◽  
Before And After

Influence of the applied pressure of the transducer on the propagation speed of the ultrasonic wave in wood

Holzforschung ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Edgar V.M. Carrasco ◽  
Rejane C. Alves ◽  
Mônica A. Smits ◽  
Vinnicius D. Pizzol ◽  
Ana Lucia C. Oliveira ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Applied Pressure ◽  
Pressure Gauge ◽  
Eucalyptus Grandis ◽  
Propagation Speed ◽  
Ultrasonic Waves ◽  
Ultrasonic Speed ◽  
Wave Propagation Speed ◽  
Propagation Technique ◽  
Non Destructive

Abstract The non-destructive wave propagation technique is used to estimate the wood’s modulus of elasticity. The propagation speed of ultrasonic waves is influenced by some factors, among them: the type of transducer used in the test, the form of coupling and the sensitivity of the transducers. The objective of the study was to evaluate the influence of the contact pressure of the transducers on the ultrasonic speed. Ninety-eight tests were carried out on specimens of the species Eucalyptus grandis, with dimensions of 120 × 120 × 50 mm. The calibration of the pressure exerted by the transducer was controlled by a pressure gauge using a previously calibrated load cell. The robust statistical analysis allowed to validate the experimental results and to obtain consistent conclusions. The results showed that the wave propagation speed is not influenced by the pressure exerted by the transducer.

scholarly journals Characterization and use of a lignin sample extracted from Eucalyptus grandis sawdust for the removal of methylene blue dye

2021 ◽  
Vol 170 ◽  
pp. 375-389
Author(s):  
Alexandra Cemin ◽  
Fabrício Ferrarini ◽  
Matheus Poletto ◽  
Luis R. Bonetto ◽  
Jordana Bortoluz ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Eucalyptus Grandis ◽  
Blue Dye ◽  
Methylene Blue Dye

Prediction of the suitable distribution of Eucalyptus grandis in China and its responses to climate change

New Forests ◽  
2021 ◽  
Author(s):  
Linnan Ouyang ◽  
Roger J. Arnold ◽  
Shaoxiong Chen ◽  
Yaojian Xie ◽  
Shae He ◽  
...  
Keyword(s):  
Climate Change ◽  
Eucalyptus Grandis

scholarly journals Eucalypt Clonal Hybrid Influences the Carbon Amount of Below-Ground Biomass in Oxisol, Brazil

2020 ◽  
Vol 3 (1) ◽  
pp. 53
Author(s):  
Grasiele Dick ◽  
Humberto J. Eufrade-Junior ◽  
Mauro V. Schumacher ◽  
Gileno B. Azevedo ◽  
Saulo P. S. Guerra
Keyword(s):  
Carbon Concentration ◽  
Eucalyptus Grandis ◽  
Eucalyptus Camaldulensis ◽  
Eucalyptus Urophylla ◽  
Ground Biomass ◽  
Homogeneity Of Variances ◽  
Below Ground ◽  
Hybrid Eucalyptus ◽  
Carbon Determination ◽  
Hybrid Clones

The objective of this study was to evaluate whether there is an influence of different clonal hybrids of Eucalyptus urophylla on the carbon concentration and amount in below-ground biomass in trees cultivated in Oxisol, Brazil. Stumps and roots of three different eucalypt hybrid clones, AEC 0144, AEC 0223, and VM01, were selected, weighed immediately after being removed from the ground, and sampled for carbon determination and moisture content at the laboratory. The Shapiro-Wilk and Bartlett tests were used to evaluate data distribution and the homogeneity of variances, respectively. Analysis of variance (ANOVA) complemented by the Scott-Knott test was used to evaluate the effects of specie/hybrid on the below-ground biomass (dry matter) and carbon amount per stump. The hybrid type of Eucalyptus urophylla does not influence the carbon concentration; however, there is a difference in below-ground biomass production and carbon amount with it being higher for Eucalyptus urophylla × Eucalyptus camaldulensis when compared to the species Eucalyptus urophylla and hybrid Eucalyptus urophylla × Eucalyptus grandis.

scholarly journals Comparative Dynamics of Above-Ground Litter Production and Decomposition from Eucalyptus Grandis Hill ex Maiden and Pinus Taeda L., and Their Contribution to Soil Organic Carbon

Forests ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 349
Author(s):  
Andrés Baietto ◽  
Jorge Hernández ◽  
Amabelia del Pino
Keyword(s):  
Pinus Taeda ◽  
Decomposition Rate ◽  
Methodological Approach ◽  
Eucalyptus Grandis ◽  
Isotopic Analysis ◽  
Forest Litter ◽  
First Year ◽  
Litter Production ◽  
Forest Species ◽  
Pinus Taeda L

The replacement of native pasture by exotic commercial forest species is an infrequent situation worldwide. In these systems, a new component is introduced, forest litter, which constitutes one of the main ways of incorporating carbon into the soil–plant system. The present work seeks to establish a methodological approach to study the dynamics of litter production and decomposition in an integrated way. The general objective was to characterize and compare the litter production dynamics in 14-year-old Eucalyptus grandis Hill ex Maiden and Pinus taeda L. commercial plantations. During two years, seasonal evaluations of fall, decomposition and accumulation of litter were carried out in stands of both species. In turn, the contribution of carbon from forest species to the soil through isotopic analysis techniques was quantified. Litterfall in E. grandis showed maximums during the spring of the first year and in the spring and summer of the second. In P. taeda, the maximums occurred in summer of the first year and in autumn of the second. In relation to the decomposition rate, the results based on short periods of evaluation between 15 and 21 months did not show differences between species, nor for the different moments of beginning of the evaluation, obtaining average values of 0.0369 month−1 for E. grandis and 0.0357 month−1 for P. taeda. In turn, both the decomposition rate of the material as a whole and the estimates of accumulated biomass in equilibrium state did not show significant differences between the species. Additionally, there was a relevant incorporation of carbon into the soil by forest species, fundamentally in the first few centimeters, substituting an important proportion of the carbon inherited by the original cover of native pastures. Finally, it is necessary to specify that the scope of the findings obtained is greatly limited by the sample size used in this study.

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