scholarly journals Yield and Nutrient Demand and Efficiency of Eucalyptus under Coppicing Regime

Forests ◽  
2020 ◽  
Vol 11 (8) ◽  
pp. 852
Author(s):  
Nathália Faria da Silva ◽  
Nairam Félix de Barros ◽  
Júlio César Lima Neves ◽  
Fernanda Schulthais ◽  
Roberto Ferreira de Novais ◽  
...  
Keyword(s):  
Nutritional Management ◽  
Eucalyptus Urophylla ◽  
Nutrient Demand ◽  
Management Regime ◽  
Eucalyptus Wood ◽  
Coppice Management ◽  
Minas Gerais State ◽  
System Use ◽  
Treatment Application ◽  
Selection Of

Eucalyptus stands can be managed by coppicing, however, in several Brazilian regions reduced yield has been observed with harvesting successions. This reduction can be attributed to reduced nutrient availability, among other factors. This study aimed to: to assess the nutritional demand of the Eucalyptus stand under a coppice regime; the effect of fertilization on the production of wood, distribution and compartmentalization of nutrients in eucalyptus stands managed by coppice; the effect of the height and number of shoots, on the occasion of the sprouting, in the production of eucalyptus managed by coppice and to compare the productivity of high eucalyptus wood with coppice management regime. The trial was conducted for clone GG157 (Eucalyptus urophylla hybrid), in Latossolo Vermelho-Amarelo (Oxisol), of the Cerrado region in Minas Gerais State, Brazil. Trees were originally planted at the 3.8 × 2.4 m spacing and, after the first harvesting, at age 84 months, the stand was managed by coppicing. Treatments consisted of: (a) fertilization or not; (b) one, two or four poles per stump; and (c) selection of 1-, 2- or 4-m-high poles and repeated three times. Sixty months after treatment application, plots of 80 trees were used for the assessments. The gain in trunk yield with fertilization and the combination between the height of poles at the time of pole selection and number of poles left varies between 140.2% for thinning when the pole is 2 m high and maintains 1 pole per strain and 128.6% when the plants are 1 m high and maintain 1 pole per strain. Not supplying nutrients in the coppicing system leads to lower accumulation of nutrients in the tree and reductions in both wood and trunk yields. Trees in the coppicing system use nutrients for trunk production more efficiently than those in high forest. Earlier pole selection enables the best use of growth resources, resulting in increased yield. Adequate nutritional management of coppiced stands results in the maintenance or increase of yield compared to the first rotation.

scholarly journals Effect of growth stress and interlocked grain on splitting of seven different hybrid clones of Eucalyptus grandis×Eucalyptus urophylla wood

Holzforschung ◽  
2020 ◽  
Vol 74 (10) ◽  
pp. 917-926
Author(s):  
Frederico José Nistal França ◽  
Tâmara Suely Filgueira Amorim França ◽  
Graziela Baptista Vidaurre
Keyword(s):  
Cross Section ◽  
Eucalyptus Grandis ◽  
Growth Stress ◽  
Eucalyptus Urophylla ◽  
Stress Indicator ◽  
Eucalyptus Wood ◽  
Standing Trees ◽  
Interlocked Grain ◽  
Hybrid Clones ◽  
Selection Of

AbstractTrees with high levels of growth stress begin to show log end splits (LES) immediately after harvesting, usually reaching its maximum end split in a week, and these tensions also create splits during lumber manufacturing. Interlocked grain is another characteristic that impacts the properties of eucalyptus wood. The aim of this study was to evaluate the effect of growth stress and interlocked grain patterns on log end splitting of seven different hybrid clones of Eucalyptus grandis × Eucalyptus urophylla planted in Brazil. The growth stress indicator (GSI) was measured in standing trees before harvesting. Splits were measured on logs in three different stages, and interlocked grain from wood blocks was obtained across the center of the cross-section. The results showed that LES occurred as soon as the trees were harvested; however, for better selection of clones, LES should be evaluated after a week of harvesting. There were statistically significant correlations for GSI with LES. Clones that presented higher values of interlocked grain tended to develop lower values of GSI and LES. Using GSI and interlocked grain measurements, it was possible to select the most indicated eucalyptus clones for lumber production.

scholarly journals Genetic effect in leaf and xylem transcriptome variations among Eucalyptus urophylla x grandis hybrids in field conditions

2018 ◽  
Vol 67 (1) ◽  
pp. 57-65
Author(s):  
Alexandre Vaillant ◽  
Astrid Honvault ◽  
Stéphanie Bocs ◽  
Maryline Summo ◽  
Garel Makouanzi ◽  
...  
Keyword(s):  
Gene Expression ◽  
Variance Components ◽  
Genetic Effect ◽  
Field Conditions ◽  
Eucalyptus Urophylla ◽  
Rna Seq ◽  
Intermediate Phenotypes ◽  
False Discovery ◽  
Hybrid Clones ◽  
Selection Of

Abstract To assess the genetic and environmental components of gene-expression variation among trees we used RNA-seq technology and Eucalyptus urophylla x grandis hybrid clones tested in field conditions. Leaf and xylem transcriptomes of three 20 month old clones differing in terms of growth, repeated in two blocks, were investigated. Transcriptomes were very similar between ramets. The number of expressed genes was significantly (P<0.05) higher in leaf (25,665±634) than in xylem (23,637±1,241). A pairwise clone comparisons approach showed that 4.5 to 14 % of the genes were diffe­rentially expressed (false discovery rate [FDR]<0.05) in leaf and 7.1 to 16 % in xylem. An assessment of among clone variance components revealed significant results in leaf and xylem in 3431 (248) genes (at FDR<0.2) and 160 (3) (at FDR<0.05), respectively. These two complementary approa­ches displayed correlated results. A focus on the phenylpro­panoid, cellulose and xylan pathways revealed a large majo­rity of low expressed genes and a few highly expressed ones, with RPKM values ranging from nearly 0 to 600 in leaf and 10,000 in xylem. Out of the 115 genes of these pathways, 45 showed differential expression for at least one pair of geno­type, five of which displaying also clone variance compo­nents. These preliminary results are promising in evaluating whether gene expression can serve as possible ‘intermediate phenotypes’ that could improve the accuracy of selection of grossly observable traits.

scholarly journals ANATOMICAL, ULTRASTRUCTURAL, PHYSICAL AND MECHANICAL WOOD PROPERTIES OF TWO-YEAR-OLD Eucalyptus grandis × Eucalyptus urophylla CLONES

2018 ◽  
Vol 42 (2) ◽  
Author(s):  
Antonio José Vinha Zanuncio ◽  
Amélia Guimarães Carvalho ◽  
Angélica de Cassia Oliveira Carneiro ◽  
Mario Tomazello Filho ◽  
Paulina Valenzuela ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Radial Direction ◽  
Eucalyptus Grandis ◽  
Basic Density ◽  
Wood Properties ◽  
Eucalyptus Urophylla ◽  
Wood Basic Density ◽  
Eucalyptus Wood ◽  
Adult Trees

ABSTRACT Eucalyptus wood from adult trees is used for several purposes; however, the wood of younger trees has limited use. This study aims to characterize and propose uses of two-year-old eucalyptus wood. Six two-year-old Eucalyptus grandis × Eucalyptus urophylla clones have been selected and their anatomical, ultrastructural, physical and mechanical wood characteristics evaluated. The wood of Clone A shows more robust fibers with better microfibril arrangement, resulting in better mechanical properties, and therefore, a better performance for structural use. Clone F showed a low variation of wood basic density in the radial direction, facilitating its machinability, and with the Clone B, showed a lower anisotropy, and therefore, the wood is recommended for locations with high variations of humidity. The heterogeneity of the wood characteristics of the evaluated clones confirms the need for further studies, to choose those most adequate to each use.

scholarly journals Growth and yield prediction using the modified Buckman model

2006 ◽  
Vol 30 (5) ◽  
pp. 787-793 ◽  
Author(s):  
Antonilmar Lopes da Silva ◽  
João Carlos Chagas Campos ◽  
Helio Garcia Leite ◽  
Agostinho Lopes de Souza ◽  
Pablo Falco Lopes
Keyword(s):  
Minas Gerais ◽  
Northern Region ◽  
Growth And Yield ◽  
Yield Prediction ◽  
Eucalyptus Urophylla ◽  
Model Data ◽  
Proposed Model ◽  
Minas Gerais State ◽  
Unbiased Estimates ◽  
Eucalyptus Cloeziana

A model to manage even-aged stands was developed using a modification of the Buckman model. Data from Eucalyptus urophylla and Eucalyptus cloeziana stands located in the Northern region of Minas Gerais State, Brazil were used in the formulation of the system. The proposed model generated precise and unbiased estimates in non-thinned stands.

scholarly journals Economic analysis and revenue optimization in management regimes of Pinus taeda

Revista CERES ◽  
2017 ◽  
Vol 64 (3) ◽  
pp. 222-231
Author(s):  
Hassan Camil David ◽  
Julio Eduardo Arce ◽  
Edilson Batista de Oliveira ◽  
Sylvio Péllico Netto ◽  
Rodrigo Otávio Veiga de Miranda ◽  
...  
Keyword(s):  
Pinus Taeda ◽  
Net Present Value ◽  
Optimal Number ◽  
Revenue Optimization ◽  
Management Regime ◽  
Forest Sites ◽  
Management Regimes ◽  
Pinus Taeda L ◽  
Harvesting Costs ◽  
Selection Of

ABSTRACT The objective of this work was to select, using operational research techniques, management regimes of Pinus taeda L. that maximize the revenue generated by the wood, considering different attractiveness rates. The OpTimber-LP® software, which performs the simulations using SisPinus® software, was used for forest optimization. The regimes consisted of different combinations of forest sites, planting densities, thinning regimes and clearcutting ages, totaling 17,760 regimes per site. Wood production was quantified and evaluated by assortment classes. Planting, thinning and harvesting costs were considered. The Annualized Net Present Value (ANPV) and the Internal Rate of Return (IRR) of each management regime were calculated. As a result, the density of 1,600 plants per ha optimized ANPV for most cases. Optimized regimes included no or only one thinning and provided ANPV of 2,753 and 158 BRL per ha and IRR of 22.9% and 2.9% for sites I and IV, respectively. It was concluded that the optimal number of thinning is reduced in lower quality sites, and the less productive the site, the later the optimal year for clearcutting. The attractiveness rate is a parameter that contributes to the selection of thinning regimes, because the larger the rate, the larger the number of thinning and the earlier they should be carried out.

Management of lesser grison (Galictis cuja) pups

2021 ◽  
Vol XXVI (150) ◽  
pp. 76-82
Author(s):  
Ynara Passini ◽  
Mayana Lima Sá ◽  
Ivez Feitosa Duarte ◽  
Fabiola Cardoso Vieira ◽  
Luiz Fernando Minello ◽  
...  
Keyword(s):  
Development Rate ◽  
Wild Animal ◽  
Nutritional Management ◽  
Clinical Parameters ◽  
Biometric Data ◽  
Wild Fauna ◽  
Management Regime ◽  
Lack Of Information ◽  
In Captivity ◽  
The Moment

The lesser grison (Galictis cuja) is a mammal that belongs to the Mustelidae family and is found in a number of countries in South America. This article describes the nutritional and biometric data and clinical parameters for four G. cuja pups cared for at the Núcleo de Reabilitação da Fauna Silvestre e Centro de Triagem de Animais Silvestres (Nurfs/Cetas) [Nucleus for the Rehabilitation of Wild Fauna and Wild Animal Evaluation Centre] of Universidade Federal de Pelotas, RS, Brazil. The pups were assessed clinically and subject to nutritional and biometric monitoring in order to learn more about the species and its development rate, given the lack of information available in the literature. All the pups demonstrated gradual body growth from arrival until the moment of release, and the nutritional management regime was shown to be appropriate for raising G. cuja in captivity.

Pemilihan Pegawai Berprestasi Pada Kantor Pegawai Badan Daerah Dengan Menggunakan Metode SAW

2021 ◽  
Vol 2 (2) ◽  
pp. 91-96
Author(s):  
Hanne Lore Br Siagian ◽  
Irfan Sudahri Damanik ◽  
Dedi Suhendro
Keyword(s):  
Human Resources ◽  
Assessment Process ◽  
System Use ◽  
And Performance ◽  
Selection Of

Management of human resources (HR) from an office do a lot in improving dedication and performance. However, in reality Simple Additive Weigthing (SAW) are carried still not optimal in the implementation of the selection of out standing employees this study aims to determine the assessment process and the selection of out standing employees the system use the method Simple Additive Weigthing (SAW) by using the ctriteria that have been used, namely work Ethincs, Absenteenism, Discipline, Cooperation and Responsible

Study on the Improvement of the Permeability of Eucalyptus grandis× Eucalyptus urophylla by Microwave Radiation

2014 ◽  
Vol 556-562 ◽  
pp. 3335-3339
Author(s):  
Jiang Tao ◽  
Kai Yuan Pen ◽  
Gui Long Wu ◽  
Jian Ping Sun ◽  
Xiu Rong Li ◽  
...  
Keyword(s):  
Microwave Radiation ◽  
Eucalyptus Grandis ◽  
Treated Wood ◽  
Untreated Wood ◽  
Microwave Treatment ◽  
Modulus Of Rupture ◽  
Test Material ◽  
Eucalyptus Urophylla ◽  
Eucalyptus Wood ◽  
Weak Points

Low permeability of fast-growing eucalyptus wood restricts its high value in use. In order to explore effective ways of improving the permeability of eucalyptus wood, the method of applying microwave radiation to Eucalyptus urophylla (Eucalyptus grandis×Eucalyptus urophylla) is used to promote its rapid evaporation of water, by which vapor pressure highly increases inside, then vapor bubbles break through the weak points of the wood tissue, as a result, the permeability of the wood is improved. Under the same conditions, wood was tested to achieve the results of water absorption rate (WAR) and water loss rate (WLR) in water sorption measurement and saturated suction drying experiment respectively, after which the permeability, the modulus of rupture (MOR) as well as the modulus of elasticity (MOE) of the test wood are recorded. The results show that the WAR and WLR of the microwave treated wood is higher than that of the untreated wood. Thus it is concluded that microwave radiation can improve the permeability of urophylla wood. But the time of microwave pretreatment has a significant effect on the WAR and WLR, which may be associated with lower microwave power and the variability of the tested material. MOR and MOE of the test material did not change significantly after the microwave treatment.

scholarly journals Mortality of the defoliator Euselasia eucerus (Lepidoptera: Riodinidae) by biotic factors in an Eucalyptus urophylla plantation in Minas Gerais State, Brazil

2009 ◽  
Vol 81 (1) ◽  
pp. 61-66 ◽  
Author(s):  
José C. Zanuncio ◽  
Jorge B. Torres ◽  
Camilla A.Z. Sediyama ◽  
Fabricio F. Pereira ◽  
Patrik L. Pastori ◽  
...  
Keyword(s):  
Native Species ◽  
Pupal Stage ◽  
Minas Gerais ◽  
Plant Canopy ◽  
Eucalyptus Urophylla ◽  
Biotic Factors ◽  
Mortality Factors ◽  
Parasitism Rate ◽  
Larval Stages ◽  
Minas Gerais State

Euselasia eucerus (Hewitson, 1872) (Lepidoptera: Riodinidae) is a Brazilian native species commonly found in Eucalyptus plantations. Biotic mortality factors of this defoliator were studied in a Eucalyptus urophylla plantation in Minas Gerais State, Brazil aiming to identify natural enemies and their impact on this insect. Euselasia eucerus had biotic mortality factors during all development stages. The most important were Trichogramma maxacalii Voegelé and Pointel, 1980 (Hymenoptera: Trichogrammatidae) during egg stage (48.9%), a tachinid fly (Diptera: Tachinidae) during larval stages (10%) and Itoplectis sp. (Hymenoptera: Ichneumonidae) during pupal stage (52.2%). The parasitism rate was higher in the basal part of the plant canopy (37.8%).

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