scholarly journals Variations in Wood Density, Annual Ring Width and Vessel Properties of Quercus brantii Affected by Crown Dieback

Forests ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 642
Author(s):  
Forough Soheili ◽  
Stephen Woodward ◽  
Isaac Almasi ◽  
Hazandy Abdul-Hamid ◽  
Hamid R. Naji
Keyword(s):  
Wood Density ◽  
Ring Width ◽  
Vessel Diameter ◽  
Zagros Mountains ◽  
Annual Ring Width ◽  
Anatomical Features ◽  
Vessel Morphology ◽  
Effects Of Drought ◽  
Quercus Brantii ◽  
Crown Dieback

Tree decline due to climate change results in physiological weaknesses, attacks by harmful pests and pathogens and threats to forest ecosystem stability. In the work described here, the effects of drought on wood density, tree ring width and variations in vessel morphology are investigated in Persian oak (Quercus brantii) in the forest of the Zagros Mountains, Ilam Province, western Iran. Discs are cut from trunks of declined and healthy trees and woodblocks are cut radially from the sapwood near the bark, at a mid-point between the vascular cambium and the pith (middle) and from wood near the pith. Observations are made on transverse sections from the blocks using microscopy. In trees with decline symptoms, wood density is greater than in healthy trees. Furthermore, declining trees have the narrowest ring width, reduced vessel diameter and area and the highest numbers of vessels and tylose in pith towards the bark. It is concluded that changes in anatomical features are associated with the weakening of trees and are components of declining tree health.

Climate sensitivity of wood-anatomical features in a ring-porous oak (Quercusmacrocarpa)

1989 ◽  
Vol 19 (5) ◽  
pp. 639-644 ◽  
Author(s):  
D. W. Woodcock
Keyword(s):  
Climate Sensitivity ◽  
Ring Width ◽  
Vessel Diameter ◽  
Regression Equation ◽  
Vessel Density ◽  
Anatomical Features ◽  
Late Wood ◽  
Precipitation Characteristics ◽  
Bur Oak ◽  
Anatomical Characters

Anatomical characters of the early- and late-wood of individuals of a ring-porous oak (bur oak, Quercusmacrocarpa Michx.) growing in southeastern Nebraska display sensitivity to yearly variations in precipitation. Characteristics of the latewood increment (latewood vessel diameter and density) are closely related to ring width, with vessel diameter varying directly and vessel density varying inversely with ring width. Various analyses indicate that ring width appears to be a less direct climatic indicator than latewood vessel diameter in these trees. A regression equation incorporating latewood vessel diameter is used successfully to reconstruct precipitation over a 9-month period (October–June).

Effects of elevated CO2 and different nutrient supplies on wood structure of European beech (Fagus sylvatica) and gray poplar (Populus × canescens)

IAWA Journal ◽  
2015 ◽  
Vol 36 (1) ◽  
pp. 84-97 ◽  
Author(s):  
Neda Lotfiomran ◽  
Jörg Fromm ◽  
Gerrit A. Luinstra
Keyword(s):  
Ring Width ◽  
European Beech ◽  
Growth Conditions ◽  
Vessel Density ◽  
Lumen Area ◽  
Growth Rings ◽  
Annual Ring Width ◽  
Anatomical Features ◽  
Vessel Lumen ◽  
Annual Growth Rings

Anatomical responses and annual ring-width of beech and poplar saplings were studied under elevated CO2-concentrations (770/950 ppm) with different nu-trient supplies during two growth periods. At the end of each growth season, saplings were harvested and stem vessel characteristics as well as annual growth-rings were analysed. In both study years, elevated CO2 caused a significant increase in ring width (RW) of beech but not of poplar. However, fertilization increased RW in poplar saplings. In beech total vessel lumen area (TVLA) and vessel density (VD) increased under elevated CO2 and both parameters decreased by fertilization. Poplar saplings grown under elevated CO2 had significantly larger vessels as well as TVLA while fertilization induced reduction in average vessel lumen area (AVLA) and TVLA. Vessel density of poplar showed no significant response to different growth conditions. Altogether, the effects of elevated CO2 and fertilization on anatomical features were independent of each other.

scholarly journals Formation of pine wood density depending on the parameters of annual ring and latitudinal zoning

2021 ◽  
Vol 875 (1) ◽  
pp. 012035
Author(s):  
A V Kiseleva ◽  
S N Snegireva ◽  
A D Platonov
Keyword(s):  
Wood Density ◽  
Annual Ring ◽  
Ring Width ◽  
Steppe Zone ◽  
Southern Taiga ◽  
Forest Steppe ◽  
Taiga Zone ◽  
Annual Ring Width ◽  
Late Wood ◽  
Southern Taiga Zone

Abstract The article presents the results of studies of changes in wood density depending on annual ring width and its characteristics. Density is a basic indicator for assessing operational and technical properties of wood. At the same time, density is characterized by certain variability within the same species, depending on annual ring characteristics, influenced by environmental factors, age of trees and position in the trunk. The purpose of this study is to establish the formation of density depending on annual ring width and late wood for Scots pine (Pinus sylvestris L.) wood in the central European part of Russia. Density research was made using the specimens with one annual ring by the method of buoyancy. Absolute values of the annual ring of early and late wood were measured in cores. It was found that wood density is only influenced by late wood width in the annual ring, being under strict genetic control. In the southern taiga zone correlation between density and late wood width is varying between 0.49-0.66 and it is less than in the forest-steppe zone. The correlation of density with annual ring width in the southern taiga zone is 0.5. It is less than in the forest-steppe zone (0.57-0.81).

scholarly journals Relationship of tracheid length, annual ring width, and wood density in Scots pine (Pinus sylvestris L.) trees from different social classes of tree position in the stand

BioResources ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. 7492-7508
Author(s):  
Ewa Fabisiak ◽  
Beata Fabisiak
Keyword(s):  
Pinus Sylvestris ◽  
Wood Density ◽  
Scots Pine ◽  
Basic Density ◽  
Ring Width ◽  
Annual Rings ◽  
Annual Ring Width ◽  
Tracheid Length ◽  
Relationship Of ◽  
The Relationship

This study investigated the relationship between the length of the tracheids, the width of annual rings, and the wood density of Scots pine (Pinus sylvestris L.) obtained from the dominant, intermediate, and suppressed classes of a 60-year-old stand. Measurement of tracheid length was performed on the material macerated from the following annual rings: 3, 6, 9, 12, 15, and thence every 5 annual rings. Basic density was determined on samples that included five annual rings from the core to bark. Tree position in the stand had a significant impact on the examined properties of wood. In a given biosocial class, tracheid length decreased as the width of annual rings increased. As the biosocial position of a tree in the stand improved, the length of the tracheids increased, and wood density decreased. In wood of the same density range, the increment in tracheid length was the greatest in wood of dominant trees and the lowest in wood of suppressed trees.

Cambial activity and ray cell abundance in Acer saccharum

1977 ◽  
Vol 55 (20) ◽  
pp. 2559-2564 ◽  
Author(s):  
R. A. Gregory
Keyword(s):  
Growth Rate ◽  
Acer Saccharum ◽  
Unit Area ◽  
Ring Width ◽  
Cambial Activity ◽  
Relative Volume ◽  
Annual Ring Width ◽  
Ray Cells ◽  
Fusiform Initials ◽  
Ray Cell

The ratio of ray and ray cell initials to fusiform initials of the vascular cambium relative to radial growth rate as reflected in the secondary xylem was studied in stems of Acer saccharum Marsh. Ray initials increased in size as they aged, slowly when growth rate was low, rapidly when it was high, but there was little fluctuation in the number of rays per unit of tangential area; as the cambium increased in circumference, the older, larger rays diverged and new small rays arose in intervening areas, thus maintaining a uniform unit area population independent of growth rate. However, since ray size increased rapidly when growth rate was high, the unit area population of ray cells rose abruptly with accelerating growth rate: the relative volume of xylem ray tissue rose from 8.6 to 12.7% of the total xylem volume when annual ring width increased from 1 to 7 mm. When fast growth was not maintained, the unit area population of ray cells declined slowly as the large rays diverged.

Relatii temporale între parametrii climatici si cresterile anuale ale speciilor forestiere (studiu de caz)

2019 ◽  
Author(s):  
Maria Nedealcov ◽  
◽  
Ala Donica ◽  
Ion Agapi ◽  
Nicolae Grigoras ◽  
...  
Keyword(s):  
Climatic Factors ◽  
Growth Parameters ◽  
Ring Width ◽  
Aridity Index ◽  
Quercus Petraea ◽  
Distribution Area ◽  
Natural Distribution ◽  
Annual Ring Width ◽  
Republic Of Moldova ◽  
The Republic

The forests on the natural distribution area from the silvosteppe zone, under the influence of climate change will experience major changes in their structure and functioning. The analysis of growth parameters for Fraxinus excelsior, Quercus petraea, Q. robur in three experimental areas from center of the Republic of Moldova indicates that the radial growth processes are influenced by the same complex of climatic factors, which differ being dendroclimatic response intensity. It has been shown that between the annual tree growth and forest aridity index - FAI, there are close correlations: the higher FAI values indicate the lower annual growth of the trees, and vice versa, low FAI values identify good development conditions of the stands (higher increases in the annual ring width).

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

scholarly journals DEPENDENCE OF PINUS SYLVESTRIS WOOD STRUCTURE AND PHYSICAL PROPERTIES ON GROWTH ENVIRONMENT CONDITIONS

2001 ◽  
Vol 1 ◽  
pp. 181
Author(s):  
Kaspars Šķēle ◽  
Dace Cīrule ◽  
Anda Alksne ◽  
Jurijs Hrols
Keyword(s):  
Physical Properties ◽  
Annual Ring ◽  
Forest Type ◽  
Ring Width ◽  
Wood Properties ◽  
Annual Ring Width ◽  
Pine Wood ◽  
Growth Environment ◽  
Earlywood Width ◽  
Parameter Values

The paper considers the variation o f annual ring parameters and physical properties of wood of the pine species prevailing in Latvia’s forests, depending on the forest type (bog-land, vacciniosa) and the growth region in Latvia (Vidzeme, Latgale). Wood samples were taken from the stem butt-end, the middle and 3 A o f the height, in its sapwood or core part. An average annual ring width, latewood and earlywood width in the year ring, the percentage of latewood in the annual ring, wood density in oven-dry state (0), tangential swelling (tg) and radial swelling (rad) o f wood, as well as volume swelling (v) and swelling anisotropy coefficient (k) o f wood were determined for the samples. A comparison of these data shows that, in the majority of cases, the indices for the wood of pines grown in vacciniose have higher values, which suggests the advantage of pine wood over the bog-land pine wood. In its turn, no unambiguous distinctions between the parameter values for pine wood o f Latgale and Vidzeme origin were found, although the pine wood of Vidzeme origin had a somewhat higher indices. It may be concluded that the greatest impact on the leading pine wood properties is caused by the forest types regarded herewith, and not the belonging o f the pine wood site to its different growth regions in Latvia.

Cost of reproduction in Douglas-fir

1992 ◽  
Vol 70 (7) ◽  
pp. 1429-1432 ◽  
Author(s):  
Yousry A. El-Kassaby ◽  
Hugh J. Barclay
Keyword(s):  
Pseudotsuga Menziesii ◽  
Annual Ring ◽  
Ring Width ◽  
Energy Allocation ◽  
Douglas Fir ◽  
Environmental Correlations ◽  
Annual Ring Width ◽  
Trade Off ◽  
Cone Production ◽  
Seed Cone

The balance between allocating energy resources to reproduction or growth has considerable theoretical interest. Conflicting ecological requirements and evolutionary pressures often necessitate a trade-off in energy allocation. We obtained measurements on seed-cone production and annual ring width of 365 Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) trees from 29 open-pollinated families for 8 years. Phenotypic, genetic, and environmental correlations were computed for seed-cone production and ring width for each year. Five of the eight environmental correlations were negative (range −0.077 to −0.305), reflecting the reality of the trade-off in physiological terms. Six of the eight genetic correlations were negative (range −0.199 to −0.776), indicating that a trade-off exists at the genetic level between energy allocation to reproduction and to somatic growth. These findings agree with the current theory of life-history evolution. Key words: Pseudotsuga menziesii, cone production, annual ring width, genetic correlation.

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.

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