scholarly journals Variation of Ring Width and Wood Density in Two Unmanaged Stands of the Mediterranean Oak Quercus faginea

Forests ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 44 ◽  
Author(s):  
Vicelina Sousa ◽  
José Louzada ◽  
Helena Pereira
Keyword(s):  
Wood Density ◽  
Ring Width ◽  
Quercus Faginea ◽  
The Mediterranean

Variation in wood density components within and between Quercus faginea trees

2011 ◽  
Vol 41 (6) ◽  
pp. 1212-1219 ◽  
Author(s):  
Sofia Knapic ◽  
José L. Louzada ◽  
Helena Pereira
Keyword(s):  
Wood Density ◽  
Ring Width ◽  
Tree Height ◽  
Solid Wood ◽  
Density Variation ◽  
Wood Products ◽  
Mature Trees ◽  
Quercus Faginea ◽  
Wood Variation ◽  
Made In

The wood of Quercus faginea Lam. was studied regarding its density variation within and between trees using microdensitometry techniques in 10 trees growing in northern Portugal. The observations were made in mature trees at several height levels (stem base and 1.3, 3.4, 5.5, 7.6, and 9.7 m). Variance analysis was done considering the core cylinder (first 15 rings) and the sheath (last 10 rings) in relation to tree, height level, and ring effects and their interactions. The wood revealed a high mean density of 0.848 g·cm–3 with small differences between earlywood and latewood (0.717 and 0.908 g·cm–3, respectively). Latewood corresponded on average to 66% of the total ring width, which averaged 2.4 mm. Wood density decreased with height and radially from pith to cambium. However, within-tree variation was of very moderate magnitude although higher for juvenile wood. Variation between trees was also small (6% coefficient of variation of the mean) and higher for the mature wood. Quercus faginea wood compares favourably with other oak species with regard to density characteristics and may be considered for production of quality solid wood products.

scholarly journals Age trends and within-site effects in wood density and radial growth in Quercus faginea mature trees

2016 ◽  
Vol 25 (1) ◽  
pp. 053 ◽  
Author(s):  
Vicelina B. Sousa ◽  
José-Luís Louzada ◽  
Helena Pereira
Keyword(s):  
Tree Ring ◽  
Wood Density ◽  
Ring Width ◽  
Tree Ring Width ◽  
Mature Trees ◽  
High Quality ◽  
Quercus Faginea ◽  
Cambial Age ◽  
Age Trends ◽  
End Uses

Aim of the study: This paper aims to valorize the wood of Quercus faginea Lam. for high quality end uses (e.g. furniture) by studying growth and quality properties using mature trees. Age trends in tree-ring width and wood density are shown and the main factors responsible for variations in tree-ring width and wood density within and between trees are investigated. Area of study: The study site is in the center of Portugal within the natural species distribution area.Material and methods: Radial samples from ten mature trees were collected at 6 heights (from base to 9.7 m) and prepared for X-ray microdensity.Main results: Wood density showed high values, ranging from 0.868 g/cm3 to 0.957 g/cm3. Wood density decreased from pith to bark and with stem height. Cambial age showed a linear relationship with wood density and most of the variation in wood is explained by age. Intra-ring and axial within-tree homogeneity was good.Research highlights: Mature trees of Q. faginea showed high wood density and a high potential for high quality end uses, comparable to other oaks. Wood density is influenced by cambial age and tree-ring width. Wood quality may be improved by tree growth rates adjustment e.g. through an adequate tree stand density (e.g. thinning operations). 

Variation in wood density and ring width in Acacia melanoxylon at four sites in Portugal

2013 ◽  
Vol 133 (1) ◽  
pp. 31-39 ◽  
Author(s):  
Fatima Tavares ◽  
José L. Louzada ◽  
Helena Pereira
Keyword(s):  
Wood Density ◽  
Ring Width ◽  
Acacia Melanoxylon

Climate signals from intra-annual wood density fluctuations in Abies durangensis

IAWA Journal ◽  
2019 ◽  
Vol 40 (2) ◽  
pp. 276-287 ◽  
Author(s):  
Marcos González-Cásares ◽  
Marín Pompa-García ◽  
Alejandro Venegas-González
Keyword(s):  
Wood Density ◽  
Drought Index ◽  
Growth Ring ◽  
Ring Width ◽  
Climatic Conditions ◽  
Density Fluctuations ◽  
Growth Ring Width ◽  
Density Values ◽  
Climate Signals ◽  
Hydroclimatic Variables

ABSTRACTOngoing climate change is expected to alter forests by affecting forest productivity, with implications for the ecological functions of these systems. Despite its great dendrochronological potential, little research has been conducted into the use of wood density as a proxy for determining sensitivity to climate variability in Mexico. The response of Abies durangensis Martínez, in terms of wood density and growth ring width, to monthly climatic values (mean temperature, accumulated precipitation and the drought index SPEI) was analyzed through correlation analysis. Abies durangensis presents a high response, in terms of radial growth, to climatic conditions. Tree-ring widths are more sensitive to hydroclimatic variables, whereas wood density values are more sensitive to temperature. In particular, mean (MeanD) and minimum (MND) wood density values are more sensitive to climate than maximum (MXD). We found very marked spatial variations that indicate that A. durangensis responds differently to drought conditions depending on the indices of density.

Influence of Growth Rate and Cambial Age on Density of Rauli (Nothofagus nervosa) in Relation to Vessel Lumen Areas and Numbers

Holzforschung ◽  
1999 ◽  
Vol 53 (2) ◽  
pp. 199-203 ◽  
Author(s):  
M. P. Denne ◽  
C. M. Cahalan ◽  
D. P. Aebischer
Keyword(s):  
Growth Rate ◽  
Wood Density ◽  
Wood Quality ◽  
Ring Width ◽  
Substantial Effect ◽  
Present Sample ◽  
Vessel Lumen ◽  
Cambial Age ◽  
Old Trees ◽  
Nothofagus Nervosa

Summary To assess the likely effects of silvicultural treatment on the wood quality of Nothofagus nervosa grown in the UK, and the possibilities of independent selection within seed origins for density and growth rate, ring width and wood density were analysed from pith to bark of 19 trees. Variations in vessel lumen size, vessel number mm−2, and total lumen area mm−2 were analysed in ten trees. Since density increased by only 0.005g cm−3 per mm increase in ring width, silvicultural practices such as initial spacing and thinning are not likely to have a substantial effect on the wood density of rauli. Similarly, variation in density with cambial age was significant but relatively minor in the 40- and 60-year old trees of the present sample, suggesting that the rotation length is unlikely to have any practical influence on the density of rauli. Considerable between-tree differences in density were found which did not correspond to differences in ring width, suggesting it should be feasible to select independently for density and growth rate. These differences in density were associated with differences in both vessel lumen size and vessel number mm−2

Centroid of wood density, bole eccentricity, and tree-ring width in relation to vector winds in wave forests

1991 ◽  
Vol 21 (1) ◽  
pp. 73-82 ◽  
Author(s):  
Alexander Robertson
Keyword(s):  
Tree Ring ◽  
Wood Density ◽  
Cross Sections ◽  
Ring Width ◽  
Circular Statistics ◽  
Tree Ring Width ◽  
Cross Sectional ◽  
Mean Vector ◽  
Vector Wind ◽  
Densitometric Data

Circular statistics are used to analyse directional data inherent in X-ray densitometric data that pertain to cross-sectional discs sampled from balsam fir wave forest trees at Spirity Cove, Newfoundland. The analysis concentrates on directionality of centroids of mean wood density, bole eccentricity, and tree-ring width in eight directions from the pith. The results show that the centroid of mean wood density, bole cross sections, and mean tree-ring width are significantly directional and correspond closely with the mean vector wind direction.

Intra-annual wood density fluctuations and tree-ring width patterns are sex- and site-dependent in the dioecious conifer Juniperus thurifera L.

Trees ◽  
2015 ◽  
Vol 29 (5) ◽  
pp. 1341-1353 ◽  
Author(s):  
José Miguel Olano ◽  
A. I. García-Cervigón ◽  
A. Arzac ◽  
V. Rozas
Keyword(s):  
Tree Ring ◽  
Wood Density ◽  
Ring Width ◽  
Density Fluctuations ◽  
Tree Ring Width ◽  
Juniperus Thurifera

scholarly journals Effects of live crown on vertical patterns of wood density and growth in Douglas-fir

2002 ◽  
Vol 32 (3) ◽  
pp. 439-447 ◽  
Author(s):  
Barbara L Gartner ◽  
Eric M North ◽  
G R Johnson ◽  
Ryan Singleton
Keyword(s):  
Wood Density ◽  
Juvenile Wood ◽  
Growth Ring ◽  
Ring Width ◽  
Douglas Fir ◽  
Mature Wood ◽  
Node Number ◽  
Growth Ring Width ◽  
Residual Variation ◽  
Wide Range

It would be valuable economically to know what are the biological triggers for formation of mature wood (currently of high value) and (or) what maintains production of juvenile wood (currently of low value), to develop silvicultural regimes that control the relative production of the two types of wood. Foresters commonly assume the bole of softwoods produces juvenile wood within the crown and mature wood below. We tested that assumption by comparing growth ring areas and widths and wood density components of the outer three growth rings in disks sampled from different vertical positions of 34-year-old Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) trees. The 18 trees were sampled from one site and had a wide range of heights to live crown. Most of the variance (63–93%) in wood characteristics (growth ring area: total, earlywood, latewood; growth ring width: total, earlywood, latewood; latewood proportion: by area, width; and ring density: total, earlywood, latewood) was due to within-tree differences (related to age of the disk). Stepwise regression analysis gave us equations to estimate wood characteristics, after which we analyzed the residuals with a linear model that included whether a disk was within or below the crown (defined as the lowest node on the stem with less than three live branches). After adjusting for tree and disk position, only 2–10% of the residual variation was associated with whether the disk was in or out of the live crown. There were no statistically significant differences at p = 0.05 between a given disk (by node number) in versus out of the crown for any of the factors studied. Moreover, the wood density characteristics were not statistically significant at p = 0.30. This research suggests that there was no effect of the crown position on the transition from juvenile to mature wood as judged by wood density. Therefore, we found no evidence to support the concept that tree spacing and live-branch pruning have a significant effect on the cambial age of transition from juvenile to mature wood in Douglas-fir trees of this age.

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