Efeito da Aplicação de Nitrogênio na Produção e Qualidade da Madeira e Carvão Vegetal de um Híbrido de Eucalyptus grandis x Eucalyptus urophylla

Assis, Claudinéia Olímpia de; Trugilho, Paulo Fernando; Goulart, Selma Lopes; Assis, Maíra Reis de; Bianchi, Maria Lúcia

doi:10.1590/2179-8087.117914

Cited by 6 publications

(4 citation statements)

References 14 publications

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“…Nitrogen is strictly linked to the increase in productivity of annual and perennial crops; however, this macronutrient does not have high assimilation by eucalypt seedlings under nursery conditions [57]. The increment of N fertilization in established planting cannot increase the density of the wood, as was observed by Assis et al [24] in a hybrid stand of E. grandis × E. urophylla in Minas Gerais state, Brazil. Thus, post-harvest organic residues are the alternative to increase the levels of organic matter and nutrients in the soil.…”

Section: Discussionmentioning

confidence: 90%

“…Careful visual examination is one of the best ways to begin to understand a set of data, to choose a model to represent the data, and to check the model and data errors [21]. The adjusted coefficient of determination and standard error estimated in percentages are the main statistical parameters used for choosing the best model [23][24][25]. The validation of the selected model, which is performed using some of the observed data, also constitutes an important step of the modeling process [26,27].…”

Section: Introductionmentioning

confidence: 99%

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Modeling Biomass and Nutrients in a Eucalyptus Stand in the Cerrado

Valadão

Carneiro

Ribeiro

et al. 2020

Forests

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The prediction of biological processes, which involve growth and plant development, is possible via the adjustment of mathematical models. In forest areas, these models assist in management practices, silviculture, harvesting, and soil fertility. Diameter, basal area, and height are predictors of volume and biomass estimates in forest stands. This study utilized different non-linear models for estimating biomass and nutrient values in the aerial biomass and roots of an unmanaged eucalypt stand in Cerrado dystrophic soil. It was hypothesized that the models would estimate the nutrients of the aboveground biomass and roots after meeting the selection and validation criteria. By statistical analysis of the parameters and subsequent validation, the Schumacher–Hall model was presented to be the best fit for biomass and nutrients. This result confirmed the ability of different variables, including diameter, basal area, and height, to be predicted. Estimating the nutrient values in the aboveground biomass and roots allowed a better understanding of the quality of the vegetal residues that remained in the soil. For dystrophic soils, which occur in the Cerrado, these estimates become even more relevant.

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Section: Discussionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Modeling Biomass and Nutrients in a Eucalyptus Stand in the Cerrado

Valadão

Carneiro

Ribeiro

et al. 2020

Forests

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“…The presence of nitrogen in the wood composition results in the formation of nitrogen oxides after combustion. Therefore, small amounts of this elemental component are desirable in the combustion and in the carbonization process of wood (Assis et al, 2018); with low emission levels of substances polluting the environment (Cantos-Macias et al, 2018).…”

Section: Elemental Chemical Analysismentioning

confidence: 99%

Chemical composition and energy potential of woody species in dry forest: subsidies for sustainable forest management

Montoya

Silva²,

Braz³

et al. 2023

Agraria

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Energy demand, especially in developing countries, is partly supplied by firewood and charcoal from natural forests. However, there are not always previous studies of energy quality, with implications for forest management. This study aimed to characterize the energy potential of the wood of six shrub-tree species from the Caatinga and the influence of the circumference class on their chemical properties and energy potential to subsidize forest management. Thus, Anadenanthera colubrina var. cebil (Angico), Cenostigma bracteosum (Catingueira), Cnidoscolus quercifolius (Faveleira), Mimosa ophthalmocentra (Jurema branca), Mimosa tenuiflora (Jurema preta) and Aspidosperma pyrifolium (Pereiro) from an area of Dry Forest (Caatinga) in Floresta, Pernambuco state, Brazil, were analyzed. Each species had three individuals sampled in five circumference classes (I a V) at 1.30 m from the ground. Carbon, hydrogen, nitrogen, insoluble lignin, and ash contents, as well as higher and lower calorific values, apparent and energetic densities and energy production were evaluated. Then, a completely randomized design in a factorial arrangement (species x circumference classes) with three replications, and comparison of means (Tukey's test, p < 0.05) were considered in the statistical analysis. A Cluster analysis was also performed aiming at joint analysis of variables. The results showed that the biomass of M. ophthalmocentra and M. tenuiflora have the highest energy density and amount of energy per unit of mass. C. quercifolius and A. pyrifolium were lower when compared to the other species. In addition, M. ophthalmocentra, M. tenuiflora, A. colubrina and C. bracteosum stood out for energy generation. Classes IV and V can be indicated as biomass for combustion, while class I has disadvantages due to higher nitrogen content and lower upper and lower calorific values.

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“…Compared to other countries, Brazil has the highest average productivity, 35.7 m³ ha -1 year -1 , in addition to the smallest rotation cycle, 4.8 years [1]. The excellent soil and weather conditions are important factors for such results, however, the selection of superior individuals, hybridization, appropriate techniques of soil management and fertilization, maximized this increase in productivity [2,3].…”

Section: Introductionmentioning

confidence: 99%

Selection of Models for Above-Ground Biomass in a Eucalyptus urograndis Stand

Carvalho

Momolli

Schumacher

2019

JEAI

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The quantification of biomass is an important tool that helps the forest manager to define the course of the enterprise and the best management techniques. In view of this situation, the objective of the present study was to perform the modeling of above -ground biomass in the different components in Eucalyptus urograndis stands at 4.5 years of age. The stand is located in the south of Brazil, municipality of São Gabriel. Four plots of 577.5 m² were installed and all DBH and heights of 20% of the trees were measured. Four diameter classes were defined, with 3 trees being felled in each of them. All the biomass was weighed in leaves, branches, bark and wood and through samples the moisture content in each component was determined. The modeling showed reliability of 96% for wood estimation and biomass total. The total biomass was 65 Mg ha -1 , of these, 72% of wood. The modeling with stepwise procedure presented good distribution of the residues. Through the easily obtained variables such as DBH and height it is possible to determine the volume of biomass accurately. Carvalho et al.; JEAI, 34(5): 1-9, 2019; Article no.JEAI.48499 2 Original Research Article

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Efeito da Aplicação de Nitrogênio na Produção e Qualidade da Madeira e Carvão Vegetal de um Híbrido de Eucalyptus grandis x Eucalyptus urophylla

Cited by 6 publications

References 14 publications

Modeling Biomass and Nutrients in a Eucalyptus Stand in the Cerrado

Modeling Biomass and Nutrients in a Eucalyptus Stand in the Cerrado

Chemical composition and energy potential of woody species in dry forest: subsidies for sustainable forest management

Selection of Models for Above-Ground Biomass in a Eucalyptus urograndis Stand

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