Efeito do método de preparo do solo, em área de reforma, nas suas características, na composição mineral e na produtividade de plantações de Eucalyptus grandis

Gatto, Alcides; Barros, Nairam Félix de; Novais, Roberto Ferreira; Costa, Liovando Marciano da; Neves, Júlio César Lima

doi:10.1590/s0100-67622003000500006

Cited by 30 publications

(36 citation statements)

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“…Although eucalyptus is known to be an Al-tolerant species, fineroot growth may be restricted by high Al 3+ activities (Silva et al, 2004), especially under conditions of low Ca 2+ availability. This could undermine water and nutrient uptake and eventually reduce tree growth because eucalyptus biomass yield seems to be related to fine-root growth (diameter ≤ 3.0 mm) (Gatto et al, 2003).…”

Section: Resultsmentioning

confidence: 99%

“…The introduction of clones with a higher yield potential and, consequently, with higher nutritional requirements, is most likely also an accelerating factor of chemical degradation of the soils, considering the close relationship between plant nutrient content and biomass productivity (Miller, 1984;Khanna & Ulrich, 1984;Herbert & Robertson, 1991;Novais & Barros, 1997;Hernández et al, 2009). In the study of a nine year-old Eucalyptus dunnii forest in temperate climate in Uruguay, it was found that commercial logs accounted for 61 % of the biomass produced, but that only 27 % of the total N, 35 % of the P, 8 % of the K, 16 % of the Ca and 41 % of the Mg present in the forest were exported with the product.…”

Section: Introductionmentioning

confidence: 99%

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Alterations of soil chemical properties by eucalyptus cultivation in five regions in the Rio Doce Valley

Leite¹,

Silva

Novais

et al. 2010

Rev. Bras. Ciênc. Solo

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SUMMARYLittle is currently known about modifications in edaphic characteristics caused by short-rotation eucalyptus and the impacts of these alterations on the sustainability of eucalyptus wood production. This study was carried out to identify theses changes at five sites of eucalyptus plantation in the region of the Rio Doce Valley, state of Minas Gerais, Brazil. Areas with more than three previous eucalyptus cycles, adjacent to pasture land or native forest, were chosen. Soil samples were collected and soil fertility analyzed by routine methods and other fractionation methods in order to measure alterations in the K, Ca and Mg contents as a consequence of eucalyptus cultivation. In the eucalyptus areas, reductions in the exchangeable Ca 2+ , Mg 2+ and K + contents and pH were observed and increased Al 3+ and H + Al contents. Of all nutrients, only P contents (Mehlich-1 P) increased in the eucalyptus areas. The reduction in exchangeable forms and in medium-term soil nutrient pools indicates the need for higher nutrient rates than the currently applied in order to prevent nutritional limitations and soil nutrient exhaustion. After several eucalyptus rotations there was a recovery in the SOM content in comparison to degraded pasture soils, although not to the level of the native forest soil. The positive correlation between effective CEC and medium-term nonexchangeable Ca, Mg and K with SOM emphasizes the need for adequate fertilizer and plant residue management to sustain or even increase forest productivity in future cycles.Index terms: exchangeable cations, fertilization, nutrient exhaustion, nutrient reserves.(

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Alterations of soil chemical properties by eucalyptus cultivation in five regions in the Rio Doce Valley

Leite¹,

Silva

Novais

et al. 2010

Rev. Bras. Ciênc. Solo

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“…Higher P, K, Ca 2+ and Mg 2+ concentrations in the surface soil layer were also observed by Gatto et al (2003). According to these authors, the higher nutrient concentrations in the soil surface layer are most likely due to the residues left after forest harvesting and the greater amount of litter layer on the soil.…”

Section: Soil Nutrient Concentrations At Different Distances From Thementioning

confidence: 88%

Soil fertility, organic carbon and fractions of the organic matter at different distances from eucalyptus stumps

Faria

Barros²,

Novais³

et al. 2009

Rev. Bras. Ciênc. Solo

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SUMMARYKnowledge on variations in vertical, horizontal and temporal characteristics of the soil chemical properties under eucalyptus stumps left in the soil is of fundamental importance for the management of subsequent crops. The objective of this work was to evaluate the effect of eucalyptus stumps (ES) left after cutting on the spatial variability of chemical characteristics in a dystrophic Yellow Argisol in the eastern coastal plain region of Brazil. For this purpose, ES left for 31 and 54 months were selected in two experimental areas with similar characteristics, to assess the decomposition effects of the stumps on soil chemical attributes. Soil samples were collected directly around these ES, and at distances of 30, 60, 90, 120 and 150 cm away from them, in the layers 0-10, 10-20 and 20-40 cm along the row of ES, which is in-between the rows of eucalyptus trees of a new plantation, grown at a spacing of 3 x 3 m. The soil was sampled in five replications in plots of 900 m 2 each and the samples analyzed for pH, available P and K (Mehlich-1), exchangeable Al, Ca and Mg, total organic carbon (TOC) and C content in humic substances (HS) and in the free light fraction. The pH values and P, K, Ca 2+ , Mg 2+ and Al 3+ contents varied between the soil layers with increasing distance from the 31 and 54-monthold stumps. The highest pH, P, K, Ca 2+ and Mg 2+ values and the lowest Al 3+ content were found in the surface soil layer. The TOC of the various fractions of soil organic matter decreased with increasing distance from the 31 and 54-month-old ES in the 0-10 and 10-20 cm layers, indicating that the root (and stump) cycling and rhizodeposition contribute to maintain soil organic matter. The C contents of the free light fraction, of the HS and TOC fractions were higher in the topsoil layer under the ES left for 31 months due to the higher clay levels of this layer, than in those found under the 54-month-old stumps. However, highest C levels of the different fractions of soil organic matter in the topsoil layer reflect the deposition and maintenance of forest residues on the soil surface, mainly after forest harvest.Index terms: nutrients, humic substances, spatial variability. RESUMO: FERTILIDADE DO SOLO, CARBONO ORGÂNICO E FRAÇÕES DA MATÉRIA ORGÂNICA EM DIFERENTES DISTÂNCIAS DA CEPA DE EUCALIPTOO conhecimento das variações vertical, horizontal e temporal de características químicas do solo sob cepas remanescentes de eucalipto é de fundamental importância para o manejo de cultivos subsequentes. O objetivo deste trabalho foi avaliar o efeito de cepas remanescentes de eucalipto (CRE) na variabilidade espacial de características químicas em um Argissolo Amarelo distrófico típico localizado na região litorânea do Espírito Santo. Para isso, foram selecionadas CRE com 31 e 54 meses de idade, em duas áreas experimentais com características semelhantes, a fim de avaliar os efeitos da decomposição delas sobre características químicas do solo. Dessa forma, amostras de solo foram coletadas ao redor dessas CRE e nas distância...

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“…Esses resultados evidenciam que ocorre aumento na densidade de raízes finas a maiores distâncias do tronco do eucalipto com o decorrer da idade. Nesse sentido, Bouillet et al (2002) verificaram que as raízes de clones de eucalipto cresciam, em média, 0,8 cm dia -1 , e Gatto et al (2003) observaram que as raízes de Eucalyptus grandis aos 38 meses de idade alcançaram o comprimento de 488,0 cm g -1 , em média, de raiz seca. De acordo com Barber (1995), a produção de raízes longas e finas são características desejáveis para aumentar a eficiência de absorção de nutrientes de baixa mobilidade no solo, como o P, bem como dos demais nutrientes do solo (FAHEY e HUGHES, 1994).…”

Section: Discussionunclassified

Características químicas do solo em diferentes distâncias do tronco de eucalipto e em diferentes profundidades

Faria¹,

Barros²,

Novais³

et al. 2009

Rev. Árvore

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e . RESUMO -O conhecimento das variações espaciais verificadas em plantações de eucalipto é importante para o estabelecimento de critérios de amostragem de solo e recomendação de fertilizantes. Este trabalho, desenvolvido na região litorânea do Espírito Santo, teve por objetivo determinar a variação de características químicas do solo em diferentes distâncias do tronco de eucalipto de povoamentos com 31, 54 e 84 meses de idade. Amostras de solo foram coletadas ao redor do tronco da árvore de DAP (diâmetro a 1,30 m de altura) médio e nas distâncias de 30, 60, 90, 120 e 150 cm, na direção da linha de plantio e da entrelinha, nas camadas de 0-10, 10-20 e 20-40 cm de profundidade, em cada parcela, num total de seis por povoamento. Nessas amostras foram analisados: pH em água (1:2,5), P e K disponíveis (Mehlich-1), Al, Ca e Mg trocáveis (KCl 1 mol L -1 ). Os resultados indicaram variações nas características químicas do solo com a distância do tronco de eucalipto. Os teores de P, K, Ca 2+ e Al 3+ diminuíram com a distância desse tronco nas três idades avaliadas, e os valores de pH aumentam com a distância do eucalipto aos 31 e 84 meses, assim como os teores de Mg 2+ em relação ao eucalipto com 31 meses, na direção da linha e da entrelinha. As características químicas do solo obtidas na linha e entrelinha do eucalipto aos 84 meses foram mais semelhantes, exceto Ca 2+ . Maiores valores de pH, P, K, Ca 2+ e Mg 2+ ocorreram na camada superficial.Palavras-chave: Nutrientes, amostragem de solo e eucalipto. CHEMICAL CHARACTERISTICS OF SOIL AT DIFFERENT DISTANCES FROM THE EUCALYPTUS TRUNK AND AT DIFFERENT DEPTHS ABSTRACT -The knowledge of spatial variations in fields with eucalyptus plantations is important for the establishment of criteria of soil sampling and fertilizer recommendation. The objective of this study was to determine the soil chemical variations affected by the distance from eucalyptus trunks along and between the planting rows in eucalypt plantations at different ages (31, 54, and 84 months), in the Eastern CoastalRegion of Brazil. Soil samples were collected around trees whose diameter at breast height corresponded to the average of the population, and at distances of 30, 60, 90, 120, and 150 cm from the trunk along and between planting rows. The samples were collected at the depths of [0][1][2][3][4][5][6][7][8][9][10][10][11][12][13][14][15][16][17][18][19][20]5), Ca, Mg,

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Efeito do método de preparo do solo, em área de reforma, nas suas características, na composição mineral e na produtividade de plantações de Eucalyptus grandis

Cited by 30 publications

References 3 publications

Alterations of soil chemical properties by eucalyptus cultivation in five regions in the Rio Doce Valley

Alterations of soil chemical properties by eucalyptus cultivation in five regions in the Rio Doce Valley

Soil fertility, organic carbon and fractions of the organic matter at different distances from eucalyptus stumps

Características químicas do solo em diferentes distâncias do tronco de eucalipto e em diferentes profundidades

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