Rendimento volumétrico e energético de clones de híbridos de &lt;i&gt;Eucalyptus&lt;/i&gt; sp. no polo gesseiro do Araripe, PE

Gadelha, Fernando Henrique de Lima; Silva, José Antônio Aleixo da; Ferreira, Rinaldo Luíz Caraciolo; Melo, Ivan Vieira de; Jorge, Danillo Lobo; Tavares, J. A.; Silva, Sérgio Peres Ramos da

doi:10.5902/198050985740

Cited by 9 publications

(9 citation statements)

References 5 publications

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“…Enquanto uma vegetação nativa, na região do Araripe, necessita de um período de quinze anos para completar seu ciclo de rotação, os eucaliptos apresentam maior produtividade em um período compreendido entre 5 e 6 anos de rotação (GADELHA et al, 2012).…”

Section: Introductionunclassified

Modelos Volumétricos Mistos Em Clones De Eucalyptus No Polo Gesseiro Do Araripe, Pernambuco

Gouveia

Silva

Ferreira

et al. 2015

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ResumoO presente estudo teve como objetivo estimar o volume de clones de Eucalyptus utilizando modelos mistos. A base de dados foi proveniente de um povoamento de clones de Eucalyptus localizado na Chapada do Araripe, no semiárido do estado de Pernambuco. Foram cubadas rigorosamente, pelo método de Smalian, 89 árvores na idade de sete anos e meio. O modelo de Schumacher e Hall foi utilizado como testemunha, para comparação com os modelos não lineares mistos. Os ajustes dos modelos mistos foram realizados adotando-se seis estruturas distintas para a matriz de variância e covariância. A seleção da melhor equação se deu por meio do critério de informação de Akaike (AIC), Teste da Razão de Máxima Verossimilhança (TRMV), Erro Percentual Absoluto Médio (EPAM) e Teste de Vuong. De acordo com os critérios adotados, os modelos mistos obtiveram melhores ajustes quando comparados com o modelo clássico de Schumacher e Hall, apresentando uma redução no erro percentual absoluto médio de 4,6% para 3,2%. Diante dos resultados obtidos, os modelos mistos não lineares se mostram bastante eficazes para modelagem do volume de Eucalyptus e tendem a contribuir para a redução dos custos do inventário com uma maior acurácia. Palavras-chave: Inventário florestal; estimação volumétrica; comparação entre modelos. AbstractMixed volumetric models in clones of Eucalyptus in the gypsum pole of Araripe, Pernambuco. The present research aimed to estimate the volume of Eucalyptus clones using mixed models. The database was derived from an experiment of Eucalyptus clones, located in the Chapada do Araripe, semiarid of the Pernambuco State. 89 trees were cubed by the method Smalian at the age of seven and a half years. The model of Schumacher and Hall was used as a control for comparison with the nonlinear mixed models. The adjustments of the mixed models were performed by adopting six distinct structures for the matrix of variances and covariances. The selection the best equation was done using the Akaike information criterion (AIC) Test Likelihood Ratio (TRMV), Mean Absolute Percentage Error (EPAM) and Vuong test. According to the criteria adopted, mixed models obtain better adjustments when compared with the classical model of Schumacher and Hall, resulting in a decrease in mean absolute percentage error of 4.6% to 3.2%. Based on these results, the nonlinear mixed models appear quite effective for modeling the volume of Eucalyptus and tend to contribute to the reduction of inventory costs with greater accuracy. Keywords: Forest inventory; volumetric estimation; comparing models. INTRODUÇÃOCom o aumento do desenvolvimento dos setores sociais e industriais, tem crescido a busca por recursos energéticos, que tem sido suprida principalmente pelas florestas nativas, com a procura da biomassa, que possui a vantagem de ser de fácil aquisição e de menor custo. Dessa forma, cresce o número de áreas desertificadas em ritmo acelerado, em razão da exploração irresponsável dos recursos florestais (OLIVEIRA et al., 2006;BARROS et al., 2010).

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Section: Introductionunclassified

Modelos Volumétricos Mistos Em Clones De Eucalyptus No Polo Gesseiro Do Araripe, Pernambuco

Gouveia

Silva

Ferreira

et al. 2015

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“…This behavior also occurs in P. taeda wood, with decrease in moisture content caused by increase in age (Furtado et al, 2012). Commonly, wood with lower density tends to have a higher moisture content (Gadelha et al, 2012), which was reflected in briquettes with higher moisture content (Table 3), when they originate from LB crops with smaller harvest interval and lower GCV ( Figure 1D). Despite the inverse relation between wood moisture and GCV (Furtado et al, 2012), it was not observed for the briquettes of this work.…”

Section: Santin D Et Almentioning

confidence: 74%

Phosphorus Fertilization and Harvest Intervals Influence Energetic and Physical Properties of Briquettes and Large Branches of Mate

Santin¹,

Sobrinho

Carneiro

et al. 2017

Rev. Árvore

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-In mate crop, the commercial part consists of leaves and thin branches, while the large branches (LB) are considered unused residues and left in the field, although they may have potential for use as energy. The objective of this paper was to evaluate the influence of phosphorus fertilization and harvest interval in productivity of mate large branches and in their physical and energetic properties, as well as in derived briquettes. In a seven-year-old plantation, doses of 0, 20, 40, 80, 160 and 320 kg.ha -1 of P 2 O 5 were applied considering harvest intervals of 12, 18 and 24 months. Dry mass, average diameter, P content, and physical and energetic properties of LB were determined. With LB, after its transformation into particles and briquetting, physical and energetic properties were determined, as well as P availability in soil. The phosphorus fertilization increased LB productivity in larger harvest intervals, increasing the amount of energy produced per unit of area, but did not change basic density and gross calorific value of wood. Mate harvest intervals did not affect the apparent density and calorific value of briquettes produced by LB. LB harvested at intervals of 18 and 24 months produced wood with higher basic density and gross calorific value. LB or briquettes have adequate energetic and physical properties, being technically a plant residue with great potential for use as energy.Keywords: Plant residues; Renewable energy; Ilex paraguariensis. ADUBAÇÃO FOSFATADA E INTERVALOS DE COLHEITA INFLUENCIAM AS PROPRIEDADES ENERGÉTICAS E FÍSICAS DE BRIQUETES E DE GALHOS GROSSOS DE ERVA-MATERESUMO -Na colheita da erva-mate, a parte comercial é composta por folhas e galhos finos, enquanto os galhos grossos (GG) são considerados resíduos e deixados no campo, mas que podem apresentar potencial para uso como energia. O objetivo do trabalho foi avaliar a influência da adubação fosfatada e do intervalo de colheita na produtividade de galhos grossos de erva-mate e em suas propriedades físicas e energéticas e, de briquetes deles derivados. Em um erval com sete anos aplicaram-se doses de 0, 20, 40, 80, 160 e 320 kg.ha -1 de P 2 O 5 e utilizandos os intervalos de colheitas de 12, 18 e 24 meses. Determinou-se a massa seca, diâmetro médio, teor de P e propriedades físicas e energéticas dos GG. Com os GG, após sua transformação em partículas e briquetagem, foram determinadas propriedades físicas e energéticas. Determinou-se, ainda, a disponibilidade de P no solo. A adubação fosfatada aumentou a produtividade do GG em intervalos maiores de colheita, aumentando a quantidade de energia produzida por unidade de área, mas não alterou a densidade básica e poder calorífico superior da madeira. Os intervalos de colheita da erva-mate não interferiram na densidade aparente e no poder calorífico de briquetes produzidos pelo GG. Os GG colhidos com intervalos de 18 e 24 meses produziram madeira com maior densidade básica e poder calorífico superior. Os GG ou os briquetes apresentam propriedades energéticas e físicas adequadas...

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“…Additional irrigation schemes are planned by the regional development company CODEVASF, although water availability simulations suggest that clear deficits may occur in the drier months (Koch et al 2015). Plantations of alternative trees, e.g., Eucalyptus spp., are suggested as a means to generate biomass for combustion, which may mitigate the substantial slashing of Caatinga for fuelwood, for instance for the gypsum industry (Gadelha et al 2012;Silva 2008). Necessary preconditions are, however, closing the water and nutrient demand gap and a thorough analysis of its sustainability and socioeconomic implications.…”

Section: Commercial and Subsistence Usesmentioning

confidence: 99%

A multi-method approach to explore environmental governance: a case study of a large, densely populated dry forest region of the neotropics

Siegmund‐Schultze

2020

Environ Dev Sustain

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Semiarid regions are often secondary on the national to global (scientific) agenda, especially if abundant vegetation elsewhere draws attention and the local population is considered backwards thinking and poverty-stricken. The Caatinga, our case study, is such a region, home to millions of Brazilians and a vast biodiversity. Unfortunately, a widely uncoordinated land use change and biodiversity decline are happening, while farmers' livelihoods are at risk. We hypothesize substantial weaknesses in the current governance practices. To explore governance of the less noticed region, we conducted interviews and field visits and complemented the findings with the literature and internet resources. Our multi-method approach combines the social-ecological systems framework with constellation analysis and dynamic modeling. The aim was to understand the current state of governance in the region and identify clues for more sustainable land management. The use and conservation of Caatinga are negotiated at multiple levels, which are only sporadically interlinked. The conversion of forest land into alternative land uses shifts and shares responsibility among different sectors, while cross-sectoral cooperation is rarely observed. The region and its population face massive prejudices. Obstructing attitudes, such as thinking in dichotomies, and paternalistic and opportunistic approaches, are being addressed by some new coalitions taking alternative action. It is unlikely that these isolated initiatives will converge by themselves to a larger transformation toward sustainable resource use. There is a need to bring the dispersed actions in a more focused and coordinated approach, integrating socioeconomic and ecological concerns, values, and partnerships.

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Rendimento volumétrico e energético de clones de híbridos de <i>Eucalyptus</i> sp. no polo gesseiro do Araripe, PE

Cited by 9 publications

References 5 publications

Modelos Volumétricos Mistos Em Clones De Eucalyptus No Polo Gesseiro Do Araripe, Pernambuco

Modelos Volumétricos Mistos Em Clones De Eucalyptus No Polo Gesseiro Do Araripe, Pernambuco

Phosphorus Fertilization and Harvest Intervals Influence Energetic and Physical Properties of Briquettes and Large Branches of Mate

A multi-method approach to explore environmental governance: a case study of a large, densely populated dry forest region of the neotropics

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