BASIC DENSITY AND FIBRE LENGTH AT BREAST HEIGHT OF EUCALYPTUS GLOBULUS SSP. GLOBULUS FOR PARAMETER PREDICTION OF THE WHOLE TREE

IAWA Journal ◽  
2003 ◽  
Vol 24 (2) ◽  
pp. 173-184 ◽  
Author(s):  
D.V. Igartúa ◽  
S.E. Monteoliva ◽  
M.G. Monterubbianesi ◽  
M.S. Villegas
Keyword(s):  
Eucalyptus Globulus ◽  
Buenos Aires ◽  
Linear Regression Analysis ◽  
Fibre Length ◽  
Basic Density ◽  
Sampling Point ◽  
Breast Height ◽  
Growing Conditions ◽  
The Relationship ◽  
Whole Tree

The aim of the present work was to analyze the associations between basic density and fibre length at breast height (BH) and of the whole tree. This study focused on the need to find a sampling point representative for the whole tree, using 35-year-old Eucalyptus globulus ssp. globulus plantations established under two different growing conditions in the province of Buenos Aires, Argentina.The relationship between whole-tree and BH values was quantified using linear regression analysis. Relationships were obtained for each growing site and wood features.

Comparative evaluation of Eucalyptus globulus and E. nitens wood and fibre quality

IAWA Journal ◽  
2017 ◽  
Vol 38 (1) ◽  
pp. 105-116 ◽  
Author(s):  
Isabel Carrillo ◽  
Sofía Valenzuela ◽  
Juan Pedro Elissetche
Keyword(s):  
Wood Density ◽  
Eucalyptus Globulus ◽  
Growth Ring ◽  
Fibre Length ◽  
Basic Density ◽  
Correlation Coefficients ◽  
Drilling Tool ◽  
Density Correlation ◽  
Breast Height ◽  
Micro Drilling

An evaluation of 100 Eucalyptus globulus and 100 E. nitens trees (six years old) was made using the Pilodyn micro-drilling tool as an indicator of wood density. Thirty E. globulus and thirty E. nitens trees with high, medium and low density were selected and sampled with an increment borer at breast height for anatomical analysis using fibre tester equipment and the Resistograph device to generate detailed information about fibre biometry and anatomical wood properties of both species for hybrid development. Eucalyptus globulus trees had a basic wood density average of 478 kg/m3, while E. nitens had a density of 490 kg/m3. Both micro-drilling tools showed significant correlation coefficients with basic wood density. Correlation coefficients between basic wood density and Pilodyn values were negative, being -0.53 (p = 0.01) and -0.68 (p < 0.001) for E. globulus and E. nitens, respectively. For both species a positive correlation was observed between basic density and Resistograph mean amplitude; the correlation coefficient was 0.84 (p < 0.001) for E. globulus, and 0.85 (p < 0.001) for E. nitens. Eucalyptus nitens trees had a higher density and amplitude average and smaller Pilodyn values than E. globulus trees, while the latter had higher coarseness, fibre length and diameter at breast height than E. nitens trees. However, E. nitens showed larger differences between features of earlywood and latewood in a growth ring than E. globulus trees.

Effect of fertilizer on wood properties of Eucalyptus globulus

2000 ◽  
Vol 30 (1) ◽  
pp. 136-144 ◽  
Author(s):  
C A Raymond ◽  
A Muneri
Keyword(s):  
Eucalyptus Globulus ◽  
Fibre Length ◽  
Basic Density ◽  
Wood Properties ◽  
Pulp Yield ◽  
Growth Responses ◽  
P Concentration ◽  
Tree Growth Rate ◽  
Western Australian ◽  
P Fertilizers

The effects of N and P fertilizers applied to Eucalyptus globulus Labill. at plantation establishment on basic density, fibre length, fibre coarseness, predicted pulp yield, and N and P concentration in the wood were examined by sampling four fertilizer factorial trials: three in Victoria and one in Western Australia. Treatments sampled were control, maximum levels of N and P by themselves and combined. Growth responses varied across sites with significant growth responses at the Victorian sites but no response at the Western Australian site. An interaction was suggested between rainfall and the effects of the fertilizer; wood properties at the drier sites were detrimentally affected by fertilizer but there was little effect at the wetter sites. On the two drier sites, application of both N and P, alone or in combination, resulted in changes in density, shorter fibres, and slightly lower predicted pulp yield. Addition of both N and P increased the levels of these nutrients in the wood at the three Victorian sites. Changes occurred in wood properties in the absence of growth responses to the applied fertilizer indicating that these changes were not induced by changing tree growth rate.

WITHIN AND BETWEEN-TREE VARIATION OF BARK CONTENT AND WOOD DENSITY OF EUCALYPTUS GLOBULUS IN COMMERCIAL PLANTATIONS

IAWA Journal ◽  
2001 ◽  
Vol 22 (3) ◽  
pp. 255-265 ◽  
Author(s):  
Teresa Quilhó ◽  
Helena Pereira
Keyword(s):  
Wood Density ◽  
Tree Growth ◽  
Eucalyptus Globulus ◽  
Basic Density ◽  
Dry Weight ◽  
Bark Thickness ◽  
Reasonable Accuracy ◽  
Wood Basic Density ◽  
Breast Height ◽  
Coefficients Of Variation

Eucalyptus globulus trees, 15 years old, were sampled at different heights from commercial pulpwood plantations in two sites in Portugal. Bark thickness was higher in the site with better growth and always decreased from the tree base to the top. Bark content was site independent and on average 11% of stem dry weight, higher at the base and top, and lower at 35% height level.Tree mean wood basic density averaged 600 kg /m3 and 568 kg /m3 for best and worst site, respectively, and was not correlated with tree growth. Wood density increased from base to top of the tree. Between-tree variation was low with coefficients of variation of site mean below 10%. Bark density (374 kg /m3 and 454 kg /m3 for best and worst site, respectively) did not show significant within tree variation. Average tree wood density could not be predicted with reasonable accuracy using a breast height sampling and better results were obtained using a sampling as a percentage of total height (e.g. 15%).

scholarly journals Genetic Variation of Physical and Chemical Wood Properties of Eucalyptus globulus

2005 ◽  
Vol 54 (1-6) ◽  
pp. 160-166 ◽  
Author(s):  
L. A. Apiolaza ◽  
C. A. Raymond ◽  
B. J. Yeo
Keyword(s):  
Genetic Variation ◽  
Eucalyptus Globulus ◽  
Genetic Correlations ◽  
Fibre Length ◽  
Microfibril Angle ◽  
Basic Density ◽  
Wood Properties ◽  
Pulp Yield ◽  
Cellulose Content ◽  
Wood Processing

Abstract This study considered the degree of genetic variation for diameter (DBH), basic density (BD), predicted pulp yield (PPY), fibre length (FL), microfibril angle (MFA) and cellulose content (CC) amongst eight subraces of Eucalyptus globulus growing in a field trial in NW Tasmania. There were significant subrace effects for BD, FL and CC. This variation affected the relative profitability of the subraces for pulp production. On average, the most profitable subraces (on NPV/ha over the base population mean) were Strzelecki Ranges ($862.04), Western Otways ($657.80) and Strzelecki Foothills ($576.81). The genetic control (heritability) of variation in DBH, FL and MFA was moderate (0.15 < h2< 0.27), while control for BD, PPY and CC was high (h2> 0.40). Genetic correlations between growth and wood properties were not statistically significant, except for DBHMFA (-0.86). Most genetic correlations amongst wood properties were outside the parametric space (< -1 or >1), but there were significant correlations between BDMFA (-0.70) and PPY-CC (0.82). The empirical response to selection on an index based on a pulp wood objective (which included volume and basic density) resulted in a gain of 4.3% for DBH, 7.9% for BD and marginal changes for all other traits, with a net impact in profit of $1,270/ha. However, future profit calculations will need to consider the effect of FL, MFA and CC on the economics of wood processing to fully evaluate the economic impact of breeding.

scholarly journals Wood Structure in Relation to Growth in Eucalyptus Gigantea Hook. F

1950 ◽  
Vol 3 (4) ◽  
pp. 393 ◽  
Author(s):  
GLA mos ◽  
JW Bisset ◽  
HE Dadswell
Keyword(s):  
Growth Rate ◽  
Ground Level ◽  
Severe Drought ◽  
Woody Tissue ◽  
Breast Height ◽  
Half Height ◽  
Late Wood ◽  
Growing Conditions ◽  
Relationship Of ◽  
The Relationship

A survey has been made of the structure of the wood of Eucalyptusgigantea Hook. f. in relation to growing conditions in the Australian CapitalTerritory. Using the number of cells cut off by the cambium at various intervalsduring the growing season as a measure of growth, mathematical expressionshave been obtained for growth in young trees at ground level, breast height,.and half height; from these, growth rate curves have been derived. The timeof year at which growth commences, the relationship of vessel production tocommencement of growth, the formation of late wood, and the period of dormancyhave all been considered in detail. Variations in fibre dimensions havebeen investigated in relation to growth and it has been shown that in anyonegrowth ring the shortest fibres are found in the early wood and the longest inthe late wood. An intrinsic relationship between growth rate and fibre dimensions�has been established, and, at the junction between late and early wood, asudden change in fibre dimensions occurs corresponding to the discontinuity ingrowth rates. Anomalous woody tissue formed during severe drought conditionsis also described.

How dense is my blue gum? prediction of whole-tree basic density of Eucalyptus globulus

New Forests ◽  
2010 ◽  
Vol 40 (2) ◽  
pp. 153-164 ◽  
Author(s):  
A. N. Callister ◽  
N. F. England
Keyword(s):  
Eucalyptus Globulus ◽  
Basic Density ◽  
Whole Tree ◽  
Blue Gum

The Influences of Palindromes in mRNA on Protein Folding Rates

2020 ◽  
Vol 27 (4) ◽  
pp. 303-312 ◽  
Author(s):  
Ruifang Li ◽  
Hong Li ◽  
Sarula Yang ◽  
Xue Feng
Keyword(s):  
Protein Folding ◽  
Regression Analysis ◽  
Linear Regression ◽  
Linear Regression Analysis ◽  
Folding Rate ◽  
Folding Rates ◽  
Negative Linear Correlation ◽  
Protein Folding Rate ◽  
The Relationship ◽  
Structure Environment

Background: It is currently believed that protein folding rates are influenced by protein structure, environment and temperature, amino acid sequence and so on. We have been working for long to determine whether and in what ways mRNA affects the protein folding rate. A large number of palindromes aroused our attention in our previous research. Whether these palindromes do have important influences on protein folding rates and what’s the mechanism? Very few related studies are focused on these problems. Objective: In this article, our motivation is to find out if palindromes have important influences on protein folding rates and what’s the mechanism. Method: In this article, the parameters of the palindromes were defined and calculated, the linear regression analysis between the values of each parameter and the experimental protein folding rates were done. Furthermore, to compare the results of different kinds of proteins, proteins were classified into the two-state proteins and the multi-state proteins. For the two kinds of proteins, the above linear regression analysis were performed respectively. Results : Protein folding rates were negatively correlated to the palindrome frequencies for all proteins. An extremely significant negative linear correlation appeared in the relationship between palindrome densities and protein folding rates. And the repeatedly used bases by different palindromes simultaneously have an important effect on the relationship between palindrome density and protein folding rate. Conclusion: The palindromes have important influences on protein folding rates, and the repeatedly used bases in different palindromes simultaneously play a key role in influencing the protein folding rates.

scholarly journals Investigating the Relationship between Public Satisfaction and Public Environmental Participation during Government Treatment of Urban Malodorous Black River in China

2021 ◽  
Vol 13 (6) ◽  
pp. 3584
Author(s):  
Shiwang Yu ◽  
Jianxia Bao ◽  
Wen Ding ◽  
Xue Chen ◽  
Xiaonan Tang ◽  
...  
Keyword(s):  
Public Participation ◽  
Public Perception ◽  
Action Plan ◽  
Linear Regression Analysis ◽  
Chinese Government ◽  
Whole Process ◽  
Residential Communities ◽  
Behavior Health ◽  
The Relationship ◽  
Environmental Participation

During China’s rapid economic development and urbanization, numerous cases of urban malodorous black river (MBR) have occurred. MBR refers to a polluted urban river that smells bad, is almost black in color, has no aquatic plants or animals, and that consequently causes many social and environmental problems. The Chinese government has sought public participation during the whole process of MBR treatment as part of a comprehensive action plan to improve residents’ satisfaction with their environment. To investigate the influencing factors of public participation and satisfaction, a questionnaire survey was conducted among residential communities close to an MBR. SPSS 22.0 was employed to conduct an analysis of the collected data, using factor analysis, correlation analysis, and linear regression analysis. The results indicate that there is a direct relationship between public satisfaction and the factors of government treatment, public perception and public participation behaviors, such as engagement behavior, supervision behavior, health influence, and compensation measures.

The Personal Sociability and Connections Scale (PeSCS): Development and initial assessment at a primary care facility

2021 ◽  
pp. 002076402199351
Author(s):  
Emmanouil K Symvoulakis ◽  
Manolis Linardakis ◽  
Apostolos Kamekis ◽  
Myfanwy Morgan ◽  
Spyridon Klinis
Keyword(s):  
Primary Care ◽  
Social Isolation ◽  
Convergent Validity ◽  
Interpersonal Relations ◽  
Linear Regression Analysis ◽  
Care Facility ◽  
Initial Assessment ◽  
Multivariate Linear Regression Analysis ◽  
Northern Greece ◽  
The Relationship

Purpose: An individual’s lack of social connections and social isolation is often associated with feelings of loneliness which is regarded as having a negative effect on health. This paper describes the development and assessment of a 10 item ‘Personal Sociability and Connections Scale’ (PeSCS) to measure individual’s disposition and accompanying skills to seek out companionship and engage in interpersonal relations. Methods: The study was conducted at a rural primary care unit in Northern Greece. A total of 199 attenders were recruited over a 6-week period in 2020 and questionnaires completed. This informed the 10-items PeSCS that comprises Social, Behavioral, and Emotional components focusing on the expression of social comfort, willingness to share experiences, stories and concepts, and feelings of similarity at first contact. Reliability of the PeSC scale was assessed and the relationship with scale scores examined as an indicator of convergent validity. A multivariate linear regression analysis was performed to examine the relationship of PeSC scale score with the characteristics of participants. Results: Assessment of reliability of PeSC scale produced a Cronbach’s alpha of 0.809. The relationship between components and the total PeSCS scores identified significant correlations ( p < .001). At a multivariate level, male gender was the sample characteristic with a significant association with scale levels ( p < .05) and higher annual income with Social component ( p < .05). Otherwise the distribution of sociability dispositions was similar across population groups. Conclusion: The 10-item PeSC scale forms a simple and quick to complete measure whose overall reliability was rated as ‘meritorious’. The PeSC instrument may be a useful tool for assessing the causes and appropriate responses to the negative health effects of loneliness and social isolation.

scholarly journals Imitated Whole Tree Harvesting Show Negligible Effect on Economic Value of Spruce Stands

Forests ◽  
2021 ◽  
Vol 12 (7) ◽  
pp. 841
Author(s):  
Iveta Desaine ◽  
Annija Kārkliņa ◽  
Roberts Matisons ◽  
Anna Pastare ◽  
Andis Adamovičs ◽  
...  
Keyword(s):  
Norway Spruce ◽  
Economic Value ◽  
Forest Types ◽  
Spruce Stands ◽  
The Difference ◽  
Growing Conditions ◽  
Whole Tree Harvesting ◽  
Whole Tree ◽  
Tree Harvesting

The increased removal of forest-derived biomass with whole-tree harvesting (WTH) has raised concerns about the long-term productivity and sustainability of forest ecosystems. If true, this effect needs to be factored in the assessment of long-term feasibility to implement such a drastic forest management measure. Therefore, the economic performance of five experimental plantations in three different forest types, where in 1971 simulated WTH event occurred, was compared with pure, planted and conventionally managed (CH) Norway spruce stands of similar age and growing conditions. Potential incomes of CH and WTH stands were based on timber prices for period 2014–2020. However, regarding the economics of root and stump biomass utilization, they were not included in the estimates. In any given price level, the difference of internal rate of return between the forest types and selected managements were from 2.5% to 6.2%. Therefore, Norway spruce stands demonstrate good potential of independence regardless of stump removal at the previous rotation.

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