scholarly journals Dynamics of initial spacing on the diameter of hybrid Eucalyptus grandis x Eucalyptus urophylla in a systematic design

2021 ◽  
pp. 422-430
Author(s):  
Mirella Basileu de Oliveira Lima ◽  
Mauro Eloi Nappo ◽  
Kálita Luis Soares ◽  
Renato Vinícius Oliveira Castro ◽  
Eder Pereira Miguel ◽  
...  
Keyword(s):  
Eucalyptus Grandis ◽  
Planting Density ◽  
Diameter Distribution ◽  
Eucalyptus Urophylla ◽  
Central Brazil ◽  
Kolmogorov Smirnov ◽  
Diameter Structure ◽  
Initial Spacing ◽  
Hybrid Eucalyptus

We evaluated the effect of initial spacing on the distribution of Eucalyptus grandis x Eucalyptus urophylla tree diameters in a Nelder wheel design. The study area was in west-central Brazil. A Nelder wheel design with three repetitions was used. This design provides 432 planting spots per plot/repetition. Planting density varied from 0.50 m² to 41.25 m². The diameter at breast height was measured for all plants every four months until 36 months of age, totaling eight measurements. The description of the diameter distribution was developed by fitting probability density functions for each spacing and age. The quality of fit was evaluated using the root mean square error percentage, Pearson’s correlation coefficient, and the Kolmogorov-Smirnov test (α < 0.05). The spacings up to 1.17 m² must be harvested in less than two years, since it is noted that in the third year the increment in diameter is static and the mortality rate increases. The spacing highly affects the diameter structure of the population, impelling the forester to consider different uses for the wood. For wood requiring larger diameters, spacing above 8.69 m² per tree is recommended

scholarly journals Procedures for theoretical redistribution of diameters in eucalyptus stands

CERNE ◽  
2010 ◽  
Vol 16 (1) ◽  
pp. 68-76 ◽  
Author(s):  
Thelma Shirlen Soares ◽  
Hélio Garcia Leite ◽  
Carlos Pedro Boechat Soares ◽  
Antônio Bartolomeu do Vale
Keyword(s):  
Probability Density Function ◽  
Probability Density ◽  
Density Function ◽  
Eucalyptus Grandis ◽  
Distribution Model ◽  
Diameter Distribution ◽  
Eucalyptus Urophylla ◽  
Traditional Procedure ◽  
Hybrid Eucalyptus ◽  
Invariant Procedure

This study aimed to evaluate the application of a procedure referred to as step invariant for theoretical redistribution of diameters by class in a diameter distribution model, using the Weibull probability density function. Data from the first rotation of hybrid eucalyptus stands (Eucalyptus grandis x Eucalyptus urophylla) planted with spacings of 3 x 2 m, located in northeastern Bahia state were used. Measurements were taken annually with measurement age ranging between 25 and 89 months. The step invariant procedure provided satisfactory results in comparison to the traditional procedure, being therefore recommended for future applications due to its unbiased results and ease of fit.

scholarly journals Eucalypt Clonal Hybrid Influences the Carbon Amount of Below-Ground Biomass in Oxisol, Brazil

2020 ◽  
Vol 3 (1) ◽  
pp. 53
Author(s):  
Grasiele Dick ◽  
Humberto J. Eufrade-Junior ◽  
Mauro V. Schumacher ◽  
Gileno B. Azevedo ◽  
Saulo P. S. Guerra
Keyword(s):  
Carbon Concentration ◽  
Eucalyptus Grandis ◽  
Eucalyptus Camaldulensis ◽  
Eucalyptus Urophylla ◽  
Ground Biomass ◽  
Homogeneity Of Variances ◽  
Below Ground ◽  
Hybrid Eucalyptus ◽  
Carbon Determination ◽  
Hybrid Clones

The objective of this study was to evaluate whether there is an influence of different clonal hybrids of Eucalyptus urophylla on the carbon concentration and amount in below-ground biomass in trees cultivated in Oxisol, Brazil. Stumps and roots of three different eucalypt hybrid clones, AEC 0144, AEC 0223, and VM01, were selected, weighed immediately after being removed from the ground, and sampled for carbon determination and moisture content at the laboratory. The Shapiro-Wilk and Bartlett tests were used to evaluate data distribution and the homogeneity of variances, respectively. Analysis of variance (ANOVA) complemented by the Scott-Knott test was used to evaluate the effects of specie/hybrid on the below-ground biomass (dry matter) and carbon amount per stump. The hybrid type of Eucalyptus urophylla does not influence the carbon concentration; however, there is a difference in below-ground biomass production and carbon amount with it being higher for Eucalyptus urophylla × Eucalyptus camaldulensis when compared to the species Eucalyptus urophylla and hybrid Eucalyptus urophylla × Eucalyptus grandis.

scholarly journals Avaliação do ajuste das funções weibull e hiperbólica a dados de povoamentos de eucalipto submetidos a desbaste

2010 ◽  
Vol 34 (2) ◽  
pp. 305-311 ◽  
Author(s):  
Helio Garcia Leite ◽  
Daniel Henrique Breda Binoti ◽  
Daniel Pereira Guimarães ◽  
Mayra Luiza Marques da Silva ◽  
Silvana Lages Ribeiro Garcia
Keyword(s):  
Eucalyptus Grandis ◽  
Eucalyptus Urophylla ◽  
Kolmogorov Smirnov

O objetivo deste estudo foi avaliar as funções de Weibull e Hiperbólica quanto à capacidade de descrição da estrutura diamétrica de povoamentos de eucalipto submetidos a desbaste. As funções com quatro e três parâmetros foram ajustadas a dados de 48 parcelas permanentes instaladas em um povoamento desbastado de um clone híbrido de eucalipto (Eucalyptus grandis x Eucalyptus urophylla), localizado na região Nordeste do Estado da Bahia. Essas parcelas foram mensuradas em 10 ocasiões, a partir de 27 meses de idade. Foi avaliado, também, o ajuste da função Weibull de dois parâmetros por aproximação linear. A aderência foi avaliada pelo teste de Kolmogorov-Smirnov. Também, foram comparadas as somas de quadrados dos resíduos (SQR), dos diferentes ajustamentos. Todas as funções apresentaram aderência aos dados (P>0,01). A função hiperbólica apresentou menor soma de quadrados de resíduos e menores valores para o teste de aderência. A função Weibull, quando ajustada por aproximação linear, apresentou os maiores valores de soma de quadrado de resíduos e de significância no teste de aderência. Foi comprovada a ineficiência do ajuste da função Weibull por aproximação linear.

scholarly journals ALTERAÇÕES TEMPORAIS NA DISTRIBUIÇÃO DIAMÉTRICA DE TECA EM DIFERENTES ESPAÇAMENTOS

Nativa ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 210
Author(s):  
Diogo Guido Streck Vendruscolo ◽  
Clebson Lima Cerqueira ◽  
João Paulo Sardo Madi ◽  
Raiane Scandiane da Silva ◽  
Samuel de Pádua Chaves e Carvalho ◽  
...  
Keyword(s):  
Tectona Grandis ◽  
Temporal Changes ◽  
Planting Density ◽  
Weibull Function ◽  
Modal Shift ◽  
Kolmogorov Smirnov ◽  
The Right ◽  
Tectona Grandis L.F ◽  
Smirnov Test

Objetivou-se neste estudo modelar e avaliar as alterações temporais da distribuição diamétrica em povoamentos experimentais de teca (Tectona grandis L.f) com diferentes espaçamentos implantados na região de Cáceres-MT. As avaliações foram realizadas aos 11, 16 e 17 anos de idade, com a base de dados proveniente da medição do diâmetro a 1,3 m de altura (dap) nas parcelas. Para a modelagem diamétrica, adotou-se a função Weibull com três parâmetros e a qualidade dos ajustes foi avaliada através do teste de Kolmogorov-Smirnov. A função de Weibull com três parâmetros descreveu com precisão a distribuição diamétrica de teca em diferentes idades e espaçamentos. O aumento do espaçamento e da idade proporcionou um deslocamento modal para a direita em função do crescimento em dap das árvores. O ingresso de árvores nas sucessivas classes de diâmetro é menor em maiores densidades independentemente da idade, verifica-se que houve uma estagnação no crescimento nos diferentes tratamentos, com mais evidência para o mais adensado (3×2 m) indicando a necessidade de intervenção silvicultural por meio de desbastes.Palavras-chave: Tectona grandis; densidade de plantio; modelagem diamétrica; manejo florestal. TEMPORAL CHANGES IN THE DIAMETRIC DISTRIBUTION OF TEAK IN DIFFERENT SPACINGS ABSTRACT: The objective of this study was to model and evaluate the temporal changes in the diametric distribution of experimental stands of teak (Tectona grandis L. f) in different spacings in the region of Cáceres-MT, Brazil. The evaluations were made at 11, 16 and 17 years of age, with the database coming from measurement of the diameter at 1.3m height (dbh) in the plots. For diametric modeling, we adopted the Weibull function with three parameters and the quality of the adjustments was by means of the Kolmogorov-Smirnov test. The Weibull function accurately described the diametric distribution of teak at different ages and spacings. The increase in spacing and age provide the modal shift to the right as a function of the growth in dbh of the trees. The entrance of trees in successive diameter classes is smaller in higher densities regardless of age, with more evidence for the denser one (3 × 2 m) indicating the need for silvicultural intervention through thinning.Keywords: Tectona grandis; planting density; diametric modeling; forest management.

scholarly journals COMPARISON BETWEEN TEST METHODS TO DETERMINE WOOD EMBEDMENT STRENGTH PARALLEL TO THE GRAIN

2016 ◽  
Vol 40 (4) ◽  
pp. 741-748 ◽  
Author(s):  
Diego Henrique de Almeida ◽  
Antonio Alves Dias
Keyword(s):  
Wood Species ◽  
Test Piece ◽  
Eucalyptus Grandis ◽  
Pinus Elliottii ◽  
Test Methods ◽  
Test Method ◽  
Eucalyptus Urophylla ◽  
Pinus Oocarpa ◽  
Hybrid Eucalyptus ◽  
Dowel Connections

ABSTRACT This study compares the test methods according to the ABNT NBR 7190:1997, EN 383:2007, ASTM D5764:2007, EUROCODE 5:2004, NDS:2001 standards in order to provide support to establish a new test method for determining the embedment strength of wood parallel to the grain. Parallel-to-grain tests were carried out for six wood species (Schizolobium amazonicum; Pinus elliottii; Pinus oocarpa; Hymenaea spp.; Lyptus(r): hybrid Eucalyptus grandis and Eucalyptus urophylla, and Goupia glabra) using four diameters (8 mm, 10 mm, 12 mm and 16 mm) for the metal pin fasteners (bolts). The experimental results obtained according to the EN 383:2007 standard were closer to the specific values for the metal-dowel connections design used by ABNT NBR 7190:1997, which are considered equal compression parallel to the grain. The use of maximum embedment force or the force causing displacement of 5 mm between the bolt and the test-piece as criteria for determining embedment strength for EN 383:2007 appears to be more appropriate than the criteria used by the Brazilian and American Standards.

scholarly journals Substrates and controlled-release fertilizations on the quality of eucalyptus cuttings

2014 ◽  
Vol 18 (11) ◽  
pp. 1124-1129 ◽  
Author(s):  
Richardson B. G. da Silva ◽  
Magali R. da Silva ◽  
Danilo Simões
Keyword(s):  
Controlled Release ◽  
Water Retention ◽  
Management Strategies ◽  
Eucalyptus Grandis ◽  
Root Systems ◽  
Eucalyptus Urophylla ◽  
Controlled Release Fertilizer ◽  
Coconut Fibre ◽  
Proper Values

To produce cuttings with quality, the most appropriate nutritional management strategies should be sought to reduce wastage of fertilizer, while accounting for the characteristics of each substrate. This study evaluated the effect of substrates and doses of controlled-release fertilizer on the quality of Eucalyptus grandis Hill ex Maiden x Eucalyptus urophylla S. T. Blake cuttings. The substrates consisted of several mixtures: vermiculite+carbonized rice chaff+coconut fibre (1:1:1); vermiculite+coconut fibre (1:1); and vermiculite+carbonized rice chaff (1:1). These mixtures were added to 2, 4, 6 and 8 kg of controlled-release fertilizer per cubic meter of substrate. The substrates that do not support root development and have lower water retention, independently of the dose of controlled-release fertilizer, reduce the quality of the root system. For substrates with proper values of water retention, such as vermiculite+coconut fibre (1:1) and vermiculite+carbonised rice chaff+coconut fibre (1:1:1), the utilization of dose 2 kg of controlled-release fertilizer to each cubic meter is enough to promote cuttings with greater quality of the root systems and proper heights and stem diameters.

scholarly journals Organogenesis and transient genetic transformation of the hybrid Eucalyptus grandis × Eucalyptus urophylla

2011 ◽  
Vol 68 (2) ◽  
pp. 246-251 ◽  
Author(s):  
Giovana Bomfim de Alcantara ◽  
João Carlos Bespalhok Filho ◽  
Marguerite Quoirin
Keyword(s):  
Genetic Transformation ◽  
Culture Media ◽  
Eucalyptus Grandis ◽  
Leaf Explants ◽  
Induction Medium ◽  
Eucalyptus Urophylla ◽  
Uida Gene ◽  
Factors Affecting ◽  
Bud Induction ◽  
Hybrid Eucalyptus

The hybrid Eucalyptus grandis x Eucalyptus urophylla presents high levels of productivity and potential for use in paper, cellulose and fiber industries. The bud organogenesis from leaf explants of two clones of E. grandis × E. urophylla was studied in order to verify the effect of several factors: subculture duration on multiplication medium, type of explants, entire and half leaves: basal and apical portions, and duration of the culture on a regeneration medium. Differences in organogenic capacity of the two clones tested were observed. The explant most recommended for organogenesis is the basal section of the leaf collected from shoot clusters subcultured every 17 days. Moreover, the leaf explants must be transferred to a fresh bud induction medium every five days. This study also aimed at evaluating factors affecting the genetic transformation of leaf explants with the uidA gene, via co-cultivation with Agrobacterium tumefaciens, such as the pre-culture of the explants on a specific medium, the duration of their co-culture with the bacteria and the addition of acetosyringone to the culture media. The best conditions for the expression of the uidA gene were two days of pre-culture of the leaf tissues, three days of co-culture with the bacteria and the addition of acetosyringone in pre- and co-culture media.

scholarly journals QUALITY OF CHARCOAL FROM THREE SPECIES OF THE Eucalyptus AND THE Corymbia citriodora SPECIES PLANTED IN THE SOUTH OF TOCANTINS

FLORESTA ◽  
2020 ◽  
Vol 50 (3) ◽  
pp. 1643
Author(s):  
Raquel Marchesan ◽  
Danyelly Nunes de Oliveira ◽  
Renata Carvalho da Silva ◽  
Lorrainy Azevedo de Carvalho ◽  
Rone Tavares Gomes ◽  
...  
Keyword(s):  
Chemical Analysis ◽  
Energy Production ◽  
Eucalyptus Grandis ◽  
Basic Density ◽  
Calorific Value ◽  
Eucalyptus Urophylla ◽  
The South ◽  
Heating Rates ◽  
Corymbia Citriodora

We aimed to assess the quality of charcoal from three Eucalyptus and Corymbia citriodora species for energy production in the South of Tocantins state. A hybrid Eucalyptus urophylla x Eucalyptus grandis, the species Eucalyptus urophylla, Eucalyptus camaldulensis, and Corymbia citriodora were selected for the study. In the preparation of the material, 20 specimens of each species with the dimensions of 2.0 x 2.0 x 5.0 cm were made, being ten repetitions for each carbonization gait with different final temperatures and heating rates. The basic wood density, total gravimetric yield, total yields in condensable and non-condensable gases, immediate chemical analysis, and higher calorific value were determined. Corymbia citriodora presented higher wood basic density (0.583 g/cm³) and charcoal apparent density (0.459 g/cm³). In immediate chemical analysis, Eucalyptus urophylla and Corymbia citriodora presented the best averages among all species. The calorific value ranged from 7235.97 to 7573.98 (kcal/kg), considered an acceptable value for energy production. The final carbonization temperature of 550°C is recommended, with Eucalyptus urophylla and Corymbia citriodora presenting the best averages.

HUBUNGAN EFIKASI DIRI DENGAN KUALITAS HIDUP PASIEN GAGAL GINJAL KRONIK YANG MENJALANI HEMODIALISIS

2018 ◽  
Vol 5 (2) ◽  
pp. 56-63
Author(s):  
Abdul Wakhid ◽  
Estri Linda Wijayanti ◽  
Liyanovitasari Liyanovitasari
Keyword(s):  
Quality Of Life ◽  
Chronic Kidney Disease ◽  
Kidney Disease ◽  
Self Efficacy ◽  
Healing Process ◽  
Sampling Technique ◽  
P Value ◽  
Cross Sectional ◽  
Kolmogorov Smirnov

Background: Self efficacy can optimize the quality of life of clients who undergo the healing process due to chronic diseases. Individuals with higher self-efficacy move their personal and social resources proactively to maintain and improve the quality and length of their lives so that they experience a better quality of life. Objectives: the purpose of this study was to find the correlation between self efficacy and quality of life of patients with chronic kidney disease who undergo hemodialysis at RSUD Semarang Regency. Metode: This type of research was descriptive correlation with cross sectional approach. The samples in this study more 76 people with total sampling technique. The data collection tool for self efficacy was measured by General Self-Efficacy scale, for quality of life with WHOQoL-BREF. Statistical test used Kolmogorov-smirnov. Result: The result showed that self efficacy in patients with chronic kidney disease was mostly in moderate category (53,9%), quality of life in patients with chronic kidney disease was mostly in good category (68,4%). There was a correlation between self efficacy and quality of life of patients with chronic kidney disease who undergo hemodialysis at RSUD Semarang Regency, the result obtained p-value of 0.000 <α (0,05). Suggestion: Patients with chronic kidney disease can maintain good quality of life by helping to generate positive self-esteem and high self efficacy.

Sign in / Sign up

Export Citation Format

Share Document