Produção e acúmulo de nutrientes em povoamento de eucalipto em consequência da intensidade do desbaste e da fertilização

Silva, Jadir Vieira da; Nogueira, Gilciano Saraiva; Santana, Reynaldo Campos; Leite, Hélio Garcia; Oliveira, Márcio Leles Romarco de; Almado, Roosevelt de Paula

doi:10.1590/s0100-204x2012001100001

Cited by 14 publications

(16 citation statements)

References 19 publications

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“…Eucalyptus production with a cultivation cycle of 7 years accumulates between 23 and 38 kg¨ha´1 of P [40][41][42][43]. Thus, in all sites there is potential supply for a high demand of P (50 kg¨ha´1) in Eucalyptus plantations [44,45]. This indicates the need to improve routine analysis methods for the quantification of available P in soil.…”

Section: Distribution Of Organic and Inorganic P Fractionsmentioning

confidence: 99%

Labile and Non-Labile Fractions of Phosphorus and Its Transformations in Soil under Eucalyptus Plantations, Brazil

Costa

Gama-Rodrigues

Gonçalves

et al. 2016

Forests

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Phosphorus (P) is the main limiting nutritional factor in the cultivation of Eucalyptus in Brazil. Despite this, little is known about the P fractions and dynamics in Eucalyptus soils in tropical regions. The aims of this study were (1) to evaluate the distribution of labile and non-labile fractions of P in soil in 10 sites of Eucalyptus in the state of São Paulo, Brazil and (2) to determine the interactions among the P fractions and to identify which fractions act as sinks or sources for the available P fraction. The P fractions were separated using the Hedley sequential extraction method, and the P transformation processes were evaluated via structural equation modeling. The labile P (resin-Pi + Pi and Po in NaHCO 3 ) varied between 6% and 16%, the moderately labile P (Pi + Po in NaOH) varied between 28% and 40%, the occluded P (Pi + Po in Sonicate + NaOH) varied between 6% and 19%, the P associated with Ca (HCl-Pi) varied between 0.4% and 3% and the residual-P varied between 35% and 47%. The hypothetical structural model of soil P cycle was composed of four P pools (latent variables): the organic pool, occluded pool, inorganic pool, and available pool. The structural model was adequate to identify functional pools of P in soil, and to identify transformation processes of P based on the source-sink relationships. The available P pool was highly dependent on inorganic and occluded pools and the organic pool acted predominantly as a sink of P on available and inorganic pools. The results reinforce the high level of recalcitrance of the organic pool and the fact that Eucalyptus plants must access pools of limited-availability P to meet their nutritional demands.

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Section: Distribution Of Organic and Inorganic P Fractionsmentioning

confidence: 99%

Labile and Non-Labile Fractions of Phosphorus and Its Transformations in Soil under Eucalyptus Plantations, Brazil

Costa

Gama-Rodrigues

Gonçalves

et al. 2016

Forests

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“…Silva et al (2012) observed an increase of 14.2% in diameter 36 months after a 50% reduction in basal area in 89 months old eucalypt plantation. Pinus taeda thinned at the age of 132 months presented an increase of 37.4% in diameter 72 months after thinning (ELESBÃO; SCHNEIDER, 2011).…”

Section: Discussionmentioning

confidence: 82%

“…As the population becomes older, high density planting accentuates the growth resource limitations which favor the mortality of dominated individuals. The death of trees is slow at first and then becomes faster and more intense, which explains natural selection, where individuals that are more vigorous and better adapted to the environment keep growing, with greater chances of survival (SMITH et al, 1997).…”

Section: Discussionmentioning

confidence: 99%

“…This effect depends on the weight of thinning, age of its application, and site quality (GERRAND et al, 1997;SCHNEIDER et al, 1998;NOGUEIRA et al, 2001;CHAVES, 2005;LEITE et al, 2005;DIAS et al, 2005;NOGUEIRA et al, 2005;STOCKS, 2007;TREVISAN et al, 2007;MONTE et al, 2009;DOBNER JR., 2012;FORRESTER;BAKER, 2012;FORRESTER et al, 2012b;SILVA et al, 2012;FORRESTER et al, 2013). Studies highlighting the interaction between artificial pruning and thinning on eucalypt growth are still scarce and recent (GERRAND et al, 1997;CHAVES, 2005;BEADLE, 2005;STOCKS, 2007;MONTE et al, 2009;FORRESTER;BAKER, 2012;FORRESTER et al, 2012bFORRESTER et al, , 2013.…”

Section: Introductionmentioning

confidence: 99%

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Thinning effect on plant growth of pruned eucalypt clone

Ramos¹,

Reis

et al. 2014

Rev. Árvore

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-A pruned stand of eucalypt clone underwent five thinning treatments with the removal of different proportion of the planted trees, at different ages: a) 0% -unthinned, b) 35% at 55 months, c) 35% at 81 months, d) 70% at 81 months, removing sprouts in the thinned plant stumps and, e) 70% at 81 months, without coppice sprouts removal. By the age of 141 months, the Weibull distribution showed higher number of trees in the smallest diameter classes for the unthinned treatment. The 70% thinning, with thinned coppice sprouts removal, presented higher number of individuals in the largest diameter classes. Height and yield were the smallest with the removal of 70% of the trees at 81 months, maintaining coppice sprouts. The afterthinning periodic annual increment was greater by thinning 35% of the trees at 55 months resulting in greater number of trees in the largest diameter classes as compared to the other treatments. Yield was higher for the unthinned treatment. The results of this study indicated that thinning 70% of the trees at the age of 81 months, with coppice sprout removal, could be recommended to obtain trees of larger diameter for multiproduct.Keywords: Forest yield; Diameter distribution; Eucalypt clone. EFEITO DO DESBASTE SOBRE O CRESCIMENTO DE PLANTAS DE CLONE DE EUCALIPTO DESRAMADO RESUMO -Um povoamento desramado de eucalipto foi submetido a cinco tratamentos de desbaste, com remoção de diferentes proporções das árvores plantadas e idades: a) 0% não desbastado, b) 35% aos 55 meses, c) 35% aos 81 meses, d) 70% aos 81 meses, removendo a brotação nas cepas desbastadas e e)

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“…This practice is an important strategy for the resumption of growth of forest stands, concentrating the production potential in an ever smaller number of individuals (Silva et al, 2012). Thinning is also important to increase the transmittance of photosynthetically active radiation for higher forage production in AFSs .…”

Section: Technical Thinning Age (Tta)mentioning

confidence: 99%

Accumulation of carbon and age of thinning of the tree component in agroforestry systems

Villanova

Jacovine

Torres

et al. 2018

Agraria

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Agroforestry systems (AFS) are considered large sinks of greenhouse gases (GHG) in the atmosphere. However, little is known about the dynamics of carbon accumulation in tree individuals over the years and the Age Thinning Technique (ATT) to potentialize GHG mitigation. The objective of the study was to predict the growth in carbon and determine the age thinning Technique of the tree component in 3 AFS in the municipality of Viçosa, MG, Brazil, in which System A is composed of eucalypt (Eucalyptus saligna) + pasture (Brachiaria decumbens) and systems B and C with eucalypt (Eucalyptus urophylla x Eucalyptus grandis) + pasture (Brachiaria decumbens). The Gompertz and Logistic models were employed to predict the timber volume and carbon growth. The ATT was determined based on the maximum productivity in timber volume per unit area. The curve asymptotic values of the systems A, B and C were 450, 221 and 226 m 3 ha -1 for the volume and 104, 51 and 52 MgC ha -1 for the carbon, respectively. Stabilization of carbon accumulation will occur close to 100 months for systems A and B and at 80 months for system C. As the ATT ranged 64-80 months, the thinning is recommended before this age to promote the carbon accumulation of the remaining arboreal individuals.Key words: growth; crop-livestock-forest; modeling; production; prognosis Acúmulo de carbono e idade técnica de desbaste do componente arbóreo em sistemas agroflorestais RESUMO: Os sistemas agroflorestais (SAFs) são considerados grandes sumidouros de gases de efeito estufa (GEE) da atmosfera. No entanto, pouco se conhece sobre a dinâmica de acúmulo de carbono nos indivíduos arbóreos ao longo dos anos e a Idade Técnica de Desbaste (ITD) para potencializar a mitigação dos GEE. O objetivo do estudo foi prognosticar o acúmulo de carbono e determinar a idade técnica de desbaste do componente arbóreo em 3 SAFs no município de Viçosa -MG. O Sistema A é composto por eucalipto (Eucalyptus saligna) + pastagem (Brachiaria decumbens) e os Sistemas B e C com eucalipto (Eucalyptus urophylla x Eucalyptus grandis) + pastagem (Brachiaria decumbens). Empregou-se os modelos Gompertz e Logístico para projetar o volume e carbono. A ITD foi determinada baseando-se na máxima produtividade em volume de madeira por unidade de área. O valor assintótico da curva dos sistemas A, B e C foi de 450, 221 e 226 m 3 ha -1 para volume e 104, 51 e 52 MgC ha -1 para carbono, respectivamente. A estabilização do acúmulo de carbono ocorrerá próximo aos 100 meses para os sistemas A e B e aos 80 meses para o sistema C. Como a ITD variou de 64 a 80 meses, recomenda-se o desbaste previamente a esta idade para favorecer o acúmulo de carbono dos indivíduos arbóreos remanescentes.Palavras-chave: crescimento; lavoura-pecuária-floresta; modelagem; produção; prognose Accumulation of carbon and age of thinning of the tree component in agroforestry systemsRev. Bras. Cienc. Agrar., Recife, v.13, n.2, e5526, 2018 2/6

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Produção e acúmulo de nutrientes em povoamento de eucalipto em consequência da intensidade do desbaste e da fertilização

Cited by 14 publications

References 19 publications

Labile and Non-Labile Fractions of Phosphorus and Its Transformations in Soil under Eucalyptus Plantations, Brazil

Labile and Non-Labile Fractions of Phosphorus and Its Transformations in Soil under Eucalyptus Plantations, Brazil

Thinning effect on plant growth of pruned eucalypt clone

Accumulation of carbon and age of thinning of the tree component in agroforestry systems

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