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

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.

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

Trees ◽

10.1007/s00468-015-1212-5 ◽

2015 ◽

Vol 29 (5) ◽

pp. 1341-1353 ◽

Cited By ~ 15

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

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Climate driven trends in tree biomass increment show asynchronous dependence on tree-ring width and wood density variation

Dendrochronologia ◽

10.1016/j.dendro.2018.02.001 ◽

2018 ◽

Vol 48 ◽

pp. 40-51 ◽

Cited By ~ 5

Author(s):

Astrid Vannoppen ◽

Pascal Boeckx ◽

Tom De Mil ◽

Vincent Kint ◽

Quentin Ponette ◽

...

Keyword(s):

Tree Ring ◽

Wood Density ◽

Ring Width ◽

Density Variation ◽

Tree Ring Width ◽

Tree Biomass ◽

Biomass Increment

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Dendrochronology of Quercus ilex L. and its potential use for climate reconstruction in the Mediterranean region

Canadian Journal of Forest Research ◽

10.1139/x09-163 ◽

2009 ◽

Vol 39 (12) ◽

pp. 2486-2493 ◽

Cited By ~ 37

Author(s):

F. Campelo ◽

C. Nabais ◽

I. García-González ◽

P. Cherubini ◽

E. Gutiérrez ◽

...

Keyword(s):

Tree Ring ◽

Tree Rings ◽

Cross Sections ◽

Quercus Ilex ◽

Function Analysis ◽

Ring Width ◽

Tree Ring Width ◽

Tree Ring Chronology ◽

Evergreen Species ◽

The Mediterranean

Holm oak ( Quercus ilex L.) is a long-lived species widely distributed across the Mediterranean Basin, with potential value for dendrochronology and dendroclimatology. However, tree-ring dating in Q. ilex is a complex task that has limited the number of dendrochronological studies using this evergreen species. In the present work, it was investigated if old Q. ilex trees showed annual tree rings and whether they can be used as climate proxies. A long tree-ring chronology (126 years) of Q. ilex was developed using cross sections of 20 trees from the Guadiana river basin (Portugal). The high correlation among tree-ring series suggested that tree growth was controlled mainly by climate. Response function analysis showed a positive correlation between tree-ring width and precipitation from October(t–1) of the previous year to January(t) of the current year and in May(t). Tree-ring width was negatively correlated with the North Atlantic oscillation that exerts a strong influence on the precipitation over Iberia. Negative pointer years were triggered by dry years and became more frequent during the last decade of the 20th century. In conclusion, it is possible to accurately date old Q. ilex trees, and their tree rings could be used for climate reconstructions across the Mediterranean.

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Tree ring width and wood density as the indicators of climatic factors and insect outbreaks affecting spruce growth

Ecological Indicators ◽

10.1016/j.ecolind.2012.04.007 ◽

2012 ◽

Vol 23 ◽

pp. 332-337 ◽

Cited By ~ 15

Author(s):

Marcin Koprowski ◽

Philipp Duncker

Keyword(s):

Tree Ring ◽

Wood Density ◽

Climatic Factors ◽

Ring Width ◽

Tree Ring Width ◽

Insect Outbreaks

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Tree-ring width and Variation of Wood Density in Fraxinus excelsior L. and Quercus robur L. Growing in Floodplain Forests

BioResources ◽

10.15376/biores.13.1.804-819 ◽

2017 ◽

Vol 13 (1) ◽

Cited By ~ 2

Author(s):

Kyriaki Giagli ◽

Jan Baar ◽

Marek Fajstavr ◽

Vladimír Gryc ◽

Hanuš Vavrčík

Keyword(s):

Tree Ring ◽

Wood Density ◽

Quercus Robur ◽

Ring Width ◽

Fraxinus Excelsior ◽

Floodplain Forests ◽

Tree Ring Width

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

Forest Systems ◽

10.5424/fs/2016251-08411 ◽

2016 ◽

Vol 25 (1) ◽

pp. 053 ◽

Cited By ~ 7

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).

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CLIMATE CHANGE, TREE-RING WIDTH AND WOOD DENSITY OF PINES IN MEDITERRANEAN ENVIRONMENTS

IAWA Journal ◽

10.1163/22941932-20150098 ◽

2015 ◽

Vol 36 (3) ◽

pp. 257-269 ◽

Cited By ~ 8

Author(s):

Jorge Olivar ◽

Cyrille Rathgeber ◽

Felipe Bravo

Keyword(s):

Tree Ring ◽

Wood Density ◽

Pinus Halepensis ◽

Moving Average ◽

Wood Quality ◽

Ring Width ◽

Growth Period ◽

Mediterranean Area ◽

Tree Ring Width ◽

Pine Species

During the second half of the 20th century, the Mediterranean area has experienced an increase in temperature, and a decrease in precipitation leading to a higher frequency of severe droughts. Consequently, widespread Mediterranean pine species suffered a shift in their climate-growth relationships that might lead to detrimental consequences. Wood features such as wood density are also affected by recent climatic changes producing an effect on wood structure and quality. Tree-ring anatomy was analyzed in three species (Pinus halepensis, P. pinaster and P. sylvestris), the three main pine species in Spain, in order to understand the relationships between tree-ring width and wood density as well as the influence of the climatic variations on these variables. Precipitation influenced tree radial growth and wood density for the three species, but at different times of the growth period. Mean and maximum density followed different patterns for the three species, decreasing with time in P. pinaster and increasing in P. halepensis and P. sylvestris. Growth and mean density trends were followed by a 5-year moving average with low variability in the three species. However, a high variability was observed in the inter-annual trends during the most recent years presumably related to climate. These climate-triggered modifications could adversely effect wood properties and wood quality.

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Selected properties of Blue spruce wood from non-forest land

Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis ◽

10.11118/actaun200957020037 ◽

2009 ◽

Vol 57 (2) ◽

pp. 37-44

Author(s):

Vladimír Gryc ◽

Hanuš Vavrčík ◽

Ondřej Kotalík

Keyword(s):

Compressive Strength ◽

Tree Ring ◽

Wood Density ◽

Ring Width ◽

Wood Properties ◽

Volumetric Shrinkage ◽

Tree Ring Width ◽

Tree Ring Analysis ◽

Blue Spruce ◽

Ring Analysis

The aim of this work was to carry out a tree-ring analysis, to determine density, shrinkage and compressive strength parallel to the grain of Blue spruce (Picea pungens Engelm.) wood. Results of this work were specific due to the non-forest origin of the sample material that was from two solitaire trees. Tree ring analysis (determination of tree ring width and portion of latewood) was carried out on the transverse section of a stem that was taken at height of 0.3 m from the tree base. Wood properties were tested according to Czech technical standards.Trees showed wide tree rings (5.65 mm) with a small portion of latewood (12.55 %). Oven dry wood density was 371.66 kg . m−3, overall volumetric shrinkage was 9.12 % and compressive strength parallel to the grain was 42.10 MPa. Due to the low age of trees results are valid for juvenile wood.Wood properties were examined along the stem radius. Tree ring width was increasing to the age of 12th year subsequently it was constant. Tree ring width was constant along the entire stem radius. Wood density, overall volumetric shrinkage and compressive strength parallel to the grain were increasing in the direction from pith to bark.

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