Dynamics of fine root distribution after establishment of monospecific and mixed-species plantations of Eucalyptus grandis and Acacia mangium

Silva, Eduardo Vinícius da; Gonçalves, José Leonardo de Moraes; Coelho, Selma Regina de Freitas; Moreira, Rildo Moreira e; Mello, Sérgio Luis de Miranda; Bouillet, Jean‐Pierre; Jourdan, Christophe; Laclau, Jean‐Paul

doi:10.1007/s11104-009-9980-6

Cited by 34 publications

(21 citation statements)

References 50 publications

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“…Plant interactions in mixed species plantations can have both positive and negative effects on growth (Forrester et al 2004;da Silva et al 2009). Other possible factors influencing wood colour in Virginstow 266/4/1 include allelopathy from the nurse crop.…”

Section: Colour Variation Between-treesmentioning

confidence: 99%

Genetic and environmental variation in heartwood colour of Australian blackwood (Acacia melanoxylon R.Br.)

Bradbury¹,

Potts²,

Beadle³

et al. 2011

Holzforschung

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Australian blackwood (Acacia melanoxylon R.Br.) is a highquality appearance-grade timber species native to eastern Australia. It is characterised by dark-coloured heartwood, with colour varying from pale straw to red-brown and walnut brown, and pale cream-coloured sapwood. This wide range in heartwood colour is expressed as between-and within-tree variation, and is regarded as a problem in markets where colour consistency is important. To understand the genetic and environmental control of heartwood colour, multiple colour measurements were taken from stem cores from 16 openpollinated family collections of blackwood planted across three 19-year-old progeny trials. Data was analysed with a mixed model with within-tree variation modelled using a three-node cubic spline. Significant genetic, environmental and genetic-by-environment interactions were detected, not only in the variation in between-tree mean heartwood colour but also in the pattern of within-tree heartwood colour variation. In general, heartwood colour became darker, less yellow and more red towards the sapwood/heartwood boundary. To control the between-and within-tree heartwood colour variation in blackwood plantations, care is needed to not only select genotypes with the desired wood colour and colour variation but also site characteristics that allow expression of that colour.

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Section: Colour Variation Between-treesmentioning

confidence: 99%

Genetic and environmental variation in heartwood colour of Australian blackwood (Acacia melanoxylon R.Br.)

Bradbury¹,

Potts²,

Beadle³

et al. 2011

Holzforschung

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“…Many studies have been carried out to assess root biomass in Eucalyptus plantations (e.g. O'Grady et al 2005;Silva et al 2009) and the role of fine roots in total belowground carbon allocation (Giardina et al 2004;Marsden et al 2010). Several process-based models have been developed recently to predict yields, water use, and resource use efficiencies in Eucalyptus plantations (e.g.…”

Section: Introductionmentioning

confidence: 99%

Fine root isotropy in Eucalyptus grandis plantations. Towards the prediction of root length densities from root counts on trench walls

et al. 2010

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The objectives of the study were to assess changes in fine root anisotropy and specific root lengths throughout the development of Eucalyptus grandis (W. Hill ex Maiden) plantations and to establish a predictive model of root length density (RLD) from root intercept counts on trench walls. Fine root densities (<1 mm in diameter) were studied in 6-, 12-, 22-, 28-, 54-, 68-and 72-month-old E. grandis plantations established on deep Ferralsols in southern Brazil. Fine root intercepts were counted on 3 faces of 90-198 soil cubes (1 dm 3 in volume) in each stand and fine root lengths (L) were measured inside 576 soil cubes, sampled between the depths of 10 cm and 290 cm. The number of fine root intercepts was counted on one vertical face perpendicular to the planting row (N t ), one vertical face parallel to the planting row (N l ) and one horizontal face (N h ), for each soil cube sampled. An overall isotropy of fine roots was shown by paired Student's t-tests between the numbers of fine roots intersecting each face of soil cubes at most stand ages and soil depths. Specific root lengths decreased with stand age in the upper soil layers and tended to increase Plant Soil (2010) 334:261-275 in deep soil layers at the end of the rotation. A linear regression established between N t and L for all the soil cubes sampled accounted for 36% of the variability of L. Such a regression computed for mean N t and L values at each sampling depth and stand age explained only 55% of the variability, as a result of large differences in the relationship between L and N t depending on stand productivity. The equation RLD= 1.89*LAI*N t , where LAI was the stand leaf area index (m 2 m −2 ) and N t was expressed as the number of root intercepts per cm 2 , made it possible to predict accurately (R 2 =0.84) and without bias the mean RLDs (cm cm −3 ) per depth in each stand, for the whole data set of 576 soil cubes sampled between 2 years of age and the end of the rotation.

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“…These factors, in addition to oxygen availability and some other factors, have been reported to determine root development soil occupation at some depths (GONÇALVES; MELLO, 2004). Root exploitation has also been found to be most efficient in the layers in which water and nutrient availability are highest (SILVA et al, 2009;LACLAU et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

Mixed and Monospecific Stands of Eucalyptus and Black-Wattle. Ii - Fine Root Biomass Density

Viera

Schumacher

Liberalesso³

et al. 2015

CERNE

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ABSTRACT:The aim of this study was to evaluate fine root biomass density (FRBD) in mixed and monospecific stands of Eucalyptus grandis x E. urophylla and Acacia mearnsii (black wattle) in Bagé-RS (Southern Brazil). An experimental trial was installed with three treatments: 100% Eucalyptus (100E); 100% Acacia mearnsii (100A); 50% Eucalyptus + 50% Acacia mearnsii (50E:50A). The trial was carried using a randomized block design with three replicates. The fine root (≤ 2.0mm) biomass density was determined 8 and 18 months after planting the trees. Soil samples were collected, with a cylindrical extractor auger (d = 7.0 cm), from four depths (0 -5, 5 -10, 10 -20 and 20 -30 cm) at each sampling point. After 8 months, the FRBD distribution was the same in both species and in all soil layers, reaching the maximum projection at 125 cm from the tree trunk. After 18 months, the root biomass density was higher in the monospecific black wattle stand than in the monospecific eucalyptus stand and the mixed stand. The fine root biomass density was highest in the 5 -10 cm layer close to the trunk, for the planting row spacing, the planting line and the diagonals between two planting lines. Knowledge about fine root growth and distribution in soil at initial stages of stand development may help in decisionmaking for intensive forestry, thus ensuring more efficient use of soil resources. PLANTIOS MONOESPECÍFICOS E MISTOS DE EUCALIPTO E ACÁCIA-NEGRA. II -DENSIDADE DE BIOMASSA DE RAÍzES FINASRESUMO: O objetivo deste estudo foi avaliar a densidade da biomassa de raízes finas (DBRF) em povoamentos monoespecíficos e misto de Eucalyptus grandis x E. urophylla na região sul do Brasil. Para isso, instalou-se área experimental no município de Bagé-RS, a qual foi constituída por três tratamentos: 100E (100% de eucalipto); 100A (100% de Acacia mearnsii); 50E:50A (50% de eucalipto + 50% de Acacia mearnsii) em delineamento de blocos ao acaso, com três repetições. Determinou-se a densidade de biomassa de raízes finas (DBRF ≤ 2,0mm) aos 8 e 18 meses após o plantio. A amostragem foi realizada com tubo extrator de formato cilíndrico com 7,0 cm de diâmetro. Para cada ponto de amostragem, coletaram-se amostras em quatro profundidades: 0 -5; 5 -10; 10 -20 e 20 -30 cm. Verificou-se que a densidade de biomassa de raízes finas (DBRF) aos 8 meses de idade, nos diferentes sistemas de cultivo, possui o mesmo comportamento para a ocupação das diferentes camadas do solo, atingindo uma projeção máxima de 125 cm de distância em relação ao tronco da árvore. Já, aos 18 meses após o plantio, verificamos que no cultivo monoespecífico de acácia-negra a densidade de raízes foi superior em relação ao monocultivo e plantio misto de eucalipto. A maior densidade de biomassa de raízes finas encontra-se na camada de 5 a 10 cm de profundidade, nas proximidades do tronco da árvore e na linha de plantio, seguida pela diagonal e entrelinha de plantio. O entendimento do crescimento e distribuição da biomassa radicular nos estágios iniciais de crescimento de povoamentos florest...

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Dynamics of fine root distribution after establishment of monospecific and mixed-species plantations of Eucalyptus grandis and Acacia mangium

Cited by 34 publications

References 50 publications

Genetic and environmental variation in heartwood colour of Australian blackwood (Acacia melanoxylon R.Br.)

Genetic and environmental variation in heartwood colour of Australian blackwood (Acacia melanoxylon R.Br.)

Fine root isotropy in Eucalyptus grandis plantations. Towards the prediction of root length densities from root counts on trench walls

Mixed and Monospecific Stands of Eucalyptus and Black-Wattle. Ii - Fine Root Biomass Density

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