Genetic control of intra-ring wood density variation in hybrid larch (Larix gmelinii var. japonica × L. kaempferi) F1

2007 ◽  
Vol 42 (3) ◽  
pp. 227-240 ◽  
Author(s):  
Takaaki Fujimoto ◽  
Kazuhito Kita ◽  
Makoto Kuromaru
Keyword(s):  
Genetic Control ◽  
Wood Density ◽  
Density Variation ◽  
Larix Gmelinii ◽  
Hybrid Larch

Age trends in the genetic parameters of wood density and the relationship with growth rates in hybrid larch (Larix gmelinii var. japonica × L. kaempferi) F1

2006 ◽  
Vol 11 (3) ◽  
pp. 157-163 ◽  
Author(s):  
Takaaki Fujimoto ◽  
Kazuhito Kita ◽  
Kazuko Uchiyama ◽  
Makoto Kuromaru ◽  
Hisashi Akutsu ◽  
...  
Keyword(s):  
Wood Density ◽  
Growth Rates ◽  
Genetic Parameters ◽  
Larix Gmelinii ◽  
Hybrid Larch ◽  
Age Trends ◽  
The Relationship

Genetic variation of wood density components in young coastal Douglas-fir: implications for tree breeding

1991 ◽  
Vol 21 (12) ◽  
pp. 1801-1807 ◽  
Author(s):  
Jesus Vargas-Hernandez ◽  
W. T. Adams
Keyword(s):  
Genetic Control ◽  
Wood Density ◽  
Genetic Relationships ◽  
Genetic Correlations ◽  
Density Variation ◽  
Douglas Fir ◽  
Control Individual ◽  
Individual Tree ◽  
Breast Height ◽  
Efficiency Of Selection

The genetic control of wood density components (earlywood density, latewood density, and latewood proportion) and their relationships with overall density in coastal Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco var. menziesii) were examined to assess the usefulness of this information in breeding for wood density. The genetic relationships of wood density with intraring density variation and bole volume growth were also investigated. Increment cores were taken at breast height from 15-year-old trees of 60 open-pollinated families. Averages across each core for overall wood density, its components, and intraring density variation were determined by using X-ray densitometry. Bole volume at age 15 for the same trees was derived from tree height and diameter at breast height measurements. Although wood density components varied significantly among families and were under moderate genetic control (individual-tree heritability (hi2) > 0.24), none had a higher heritability than overall density (hi2 = 0.59). Density components had strong genetic correlations with overall density (r ≥ 0.74) but were also strongly related among themselves (0.57 ≤ r ≤ 0.92). Thus, density components have limited value in improving the efficiency of selection for overall density. Overall density was positively correlated with intraring density variation (r = 0.72) and negatively correlated with bole volume (r = −0.52). Comparison of several selection indices incorporating wood density and one or more growth traits, however, showed that it is possible to obtain substantial gains in bole volume without loss in (or even with a modest increase in) wood density. By restricting the response in wood density, the change in intraring density variation can also be limited.

scholarly journals Hybrid larch heterosis: for which traits and under which genetic control?

2017 ◽  
Vol 13 (5) ◽  
Author(s):  
Alexandre Marchal ◽  
Facundo Muñoz ◽  
Frédéric Millier ◽  
Leopoldo Sánchez ◽  
Luc E. Pâques
Keyword(s):  
Genetic Control ◽  
Hybrid Larch

Wood density of natural white spruce populations in Quebec

1987 ◽  
Vol 17 (7) ◽  
pp. 675-682 ◽  
Author(s):  
A. Corriveau ◽  
J. Beaulieu ◽  
F. Mothe
Keyword(s):  
Wood Density ◽  
Rapid Growth ◽  
Juvenile Wood ◽  
White Spruce ◽  
Density Variation ◽  
Mature Wood ◽  
Growth Rings ◽  
Breeding Programs ◽  
Genetic Sampling ◽  
The Individual

During genetic sampling of white spruce in 1984, increment cores were taken from 80 populations in order to study wood density variation within species in natural Quebec forests. Results show that wood density differences exist between populations and that wood density is negatively correlated with the width of the growth rings; however, some trees and some populations exhibit both high wood density and rapid growth. A moderate positive link was found between juvenile and mature wood densities at both the individual and population levels. Therefore, breeding programs for the improvement of wood density could be based on selections made on juvenile wood.

scholarly journals Genetic control of stiffness of standing Douglas fir; from the standing stem to the standardised wood sample, relationships between modulus of elasticity and wood density parameters. Part II

1999 ◽  
Vol 56 (2) ◽  
pp. 145-154 ◽  
Author(s):  
Philippe Rozenberg ◽  
Alain Franc ◽  
Cécile Mamdy ◽  
Jean Launay ◽  
Nicolas Schermann ◽  
...  
Keyword(s):  
Genetic Control ◽  
Wood Density ◽  
Modulus Of Elasticity ◽  
Wood Sample ◽  
Douglas Fir

Estimation of Wood Stiffness and Strength Properties of Hybrid Larch by Near-Infrared Spectroscopy

2007 ◽  
Vol 61 (8) ◽  
pp. 882-888 ◽  
Author(s):  
Takaaki Fujimoto ◽  
Hiroyuki Yamamoto ◽  
Satoru Tsuchikawa
Keyword(s):  
Near Infrared ◽  
Nir Spectroscopy ◽  
Strength Properties ◽  
Density Variation ◽  
Modulus Of Rupture ◽  
Cellulose Content ◽  
Hybrid Larch ◽  
Absorption Bands ◽  
Wood Stiffness ◽  
Predicted Values

This work was undertaken to investigate the feasibility of near-infrared (NIR) spectroscopy for estimating wood mechanical properties, i.e., modulus of elasticity (MOE) and modulus of rupture (MOR) in bending tests. Two sample sets having large and limited density variation were prepared to examine the effects of wood density on estimation of MOE and MOR by the NIR technique. Partial least squares (PLS) analysis was employed and it was found that the relationships between laboratory-measured and NIR-predicted values were good in the case of sample sets having large density variation. MOE could be estimated even when density variation in the sample set was limited. It was concluded that absorption bands due to the OH group in the semi-crystalline or crystalline regions of cellulose strongly influenced the calibrations for bending stiffness of hybrid larch. This was also suggested from the result that both α-cellulose content and cellulose crystallinity showed moderate positive correlation to wood stiffness.

Integrated system of equations for estimating stem volume, density, and biomass for Australian redcedar (Toona ciliata) plantations

2017 ◽  
Vol 47 (5) ◽  
pp. 681-689 ◽  
Author(s):  
Natalino Calegario ◽  
Timothy G. Gregoire ◽  
Tatiane Antunes da Silva ◽  
Mario Tomazello Filho ◽  
Joyce A. Alves
Keyword(s):  
Wood Density ◽  
Nonlinear Function ◽  
Volume Density ◽  
Density Variation ◽  
Integrated System ◽  
Stem Volume ◽  
System Of Equations ◽  
Stem Wood ◽  
Toona Ciliata ◽  
Density And Biomass

A system of equations is proposed to assess the stem wood density variation of Toona ciliata M. Roem. growing in Brazilian plantations. As a taper function, a third-degree polynomial was fitted and the stem radius squared (r2), the dependent variable, was estimated as a function of diameter at breast height (dbh), total height (ht), and radius (r) at height (h). A nonlinear function was fitted to estimate wood density variation, having as the independent variable the ratio of r to h. The stem mass was estimated by integrating the product of stem volume and wood density. Stem measurements from a group of 72 trees of T. ciliata were used to fit the taper equation. A group of six trees was selected and a wood density database was created using X-ray technology. Both the taper and the nonlinear functions performed well in estimating the radius and the wood density. The within-tree wood density systematically increased from pith to bark and from the base to the top of the tree. With the density varying from base to top, the estimated mass of the stem, compared with the mass estimated using wood density value at dbh, had a bias of 4.2%. When the density variations from base to top and from pith to bark of the tree were considered, the estimated mass had a bias of 1.5%.

scholarly journals Long-Term Wood Micro-Density Variation in Alpine Forests at Central México and Their Spatial Links with Remotely Sensed Information

Forests ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 452 ◽  
Author(s):  
A. Correa-Díaz ◽  
A. Gómez-Guerrero ◽  
J. J. Vargas-Hernández ◽  
P. Rozenberg ◽  
W. R. Horwath
Keyword(s):  
Wood Density ◽  
Elevation Gradient ◽  
Remotely Sensed ◽  
High Elevation ◽  
Density Variation ◽  
Distribution Functions ◽  
Cumulative Distribution ◽  
Cambial Age ◽  
Latewood Density ◽  
High Elevation Forests

Ongoing climate variability strongly affects high-elevation forests, influencing the wood formation process (e.g., xylogenesis). Furthermore, spatio-temporal studies to establish links of wood properties and tree performance are needed. Using linear mixed-effects models, empirical cumulative distribution functions, and spatial analysis, we explore time trends and space connections of wood density of Pinus hartwegii Lindl. to remotely sensed variables (Moderate Resolution Imaging Spectro-radiometer MODIS-derived) in two high-elevation forests in México, Tláloc (TLA) and Jocotitlán (JOC) Mountains. Results indicated that elevation and cambial age effects are important factors explaining wood density variation. Minimum earlywood—MID, average—AVE, and maximum latewood density—MXD were statistically similar between mountains (p > 0.05), but TLA showed a significant increase in MID over time with higher values after 1950. Wood density values and spatial correlations were site-dependent with TLA exhibiting the highest correlations between MXD and the Normalized Difference Vegetation Index (NDVI) of the spring season (r = 0.59, p < 0.05). Overall, correlations to remotely sensed information were positive with MXD, negative for MID and divergent for AVE. Historical temperature defines MID along the elevation gradient, while MXD was related to soil moisture only at low-elevation sites where soils are deeper. We found that two high-elevation forests, 115 km away from each other, with similar climate, soil, and vegetation, behaved differently regarding their xylogenesis, indicating the potential of using the link between wood micro-density and remotely sensed information to understand forest response to climate change effects.

scholarly journals Genetic control of stiffness of standing Douglas fir; from the standing stem to the standardised wood sample, relationships between modulus of elasticity and wood density parameters. Part I

1999 ◽  
Vol 56 (2) ◽  
pp. 133-143 ◽  
Author(s):  
Cécile Mamdy ◽  
Philippe Rozenberg ◽  
Alain Franc ◽  
Jean Launay ◽  
Nicolas Schermann ◽  
...  
Keyword(s):  
Genetic Control ◽  
Wood Density ◽  
Modulus Of Elasticity ◽  
Wood Sample ◽  
Douglas Fir
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