Chemical composition of Loblolly pine wood as related to specific gravity, growth rate, and distance from pith

Formation of radial resin ducts and their associated secretory cells in loblolly pine (Pinus taeda L.) is influenced by the age and growth rate of the annual ring in which the ducts are formed. The spatial pattern of radial ducts on the tangential plane is nonrandom, exhibiting a regular or dispersed pattern. A significantly higher density of radial ducts was found in the inner, first-formed growth rings at all heights within the tree. Radial duct formation was found to be positively correlated with radial growth rate, when growth rate is expressed as increment of cross-sectional area growth. These findings may partially explain why older, slower growing trees tend to be more susceptible to attack by the southern pine beetle, Dendroctonus frontalis Zimmermann, and associated microorganisms, since the resin-producing system is a primary defense against these agents.

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Thermal Parameters, Microstructure and Porosity During Transient Solidification of Ternary Al–Cu–Si Alloys

Materials Science Forum ◽

10.4028/www.scientific.net/msf.730-732.883 ◽

2012 ◽

Vol 730-732 ◽

pp. 883-888 ◽

Cited By ~ 3

Author(s):

Daniel J. Moutinho ◽

Laércio G. Gomes ◽

Otávio L. Rocha ◽

Ivaldo L. Ferreira ◽

Amauri Garcia

Keyword(s):

Growth Rate ◽

Chemical Composition ◽

Cooling Rate ◽

Tip Growth ◽

Thermal Parameters ◽

Volumetric Fraction ◽

Dendritic Network ◽

Intermetallic Particles ◽

Casting Length

Solidification of ternary Al-Cu-Si alloys begins with the development of a complex dendritic network typified by primary (λ1) and secondary (λ2) dendrite arm spacings which depend on the chemical composition of the alloy and on the casting thermal parameters such as the growth rate and the cooling rate. These thermal parameters control the scale of dendritic arms, the size and distribution of porosity and intermetallic particles in the casting. In this paper, λ1and λ2were correlated with experimental thermal parameters i.e., the tip growth rate and the tip cooling rate. The porosity profile along the casting length has also been experimentally determined. The volumetric fraction of pores increase with the increase in alloying Si and with the increase in Fe concentration at the regions close to the casting cooled surface.

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Determination of Basic Density and Moisture Content of Loblolly Pine Wood Disks Using a near Infrared Hyperspectral Imaging System

Journal of Near Infrared Spectroscopy ◽

10.1255/jnirs.948 ◽

2011 ◽

Vol 19 (5) ◽

pp. 401-409 ◽

Cited By ~ 26

Author(s):

Christian R. Mora ◽

Laurence R. Schimleck ◽

Seung-Chul Yoon ◽

Chi N. Thai

Keyword(s):

Moisture Content ◽

Hyperspectral Imaging ◽

Loblolly Pine ◽

Near Infrared ◽

Imaging System ◽

Basic Density ◽

Pine Wood

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Ignition and volatilization behavior of dust from loblolly pine wood

Fuel Processing Technology ◽

10.1016/j.fuproc.2014.04.036 ◽

2014 ◽

Vol 127 ◽

pp. 117-123 ◽

Cited By ~ 13

Author(s):

G. Hehar ◽

O. Fasina ◽

S. Adhikari ◽

J. Fulton

Keyword(s):

Loblolly Pine ◽

Pine Wood ◽

Volatilization Behavior

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Place of Wood Specific Gravity in the Development of Advanced-Generation Seed Orchards and Breeding Programs

Southern Journal of Applied Forestry ◽

10.1093/sjaf/6.3.177 ◽

1982 ◽

Vol 6 (3) ◽

pp. 177-180

Author(s):

J. B. Jett ◽

J. T. Talbert

Keyword(s):

Specific Gravity ◽

Loblolly Pine ◽

Second Generation ◽

Improvement Program ◽

Breeding Programs ◽

The North ◽

Wood Specific Gravity ◽

High Heritability ◽

Pinus Taeda L ◽

Advanced Generation

Abstract Data from thinnings of 11 genetic tests with an average age of 10 years and from 364 eight-year-old second-generation selections were analyzed to provide an estimate of gain from one cycle of selection for wood specific gravity. Utilizing mid-parent, mature, wood specific gravities and progeny juvenile wood specific gravities, coefficients of genetic prediction, CGP = 0.55 and 0.41, were calculated for the genetic test thinning sample and second-generation selection sample. Expressed as a percentage of the mean, gain from selection was calculated to be 2.6 percent. A strategy was also developed to include wood specific gravity in the North Carolina State Cooperative's second-generation loblolly pine (Pinus taeda L.) improvement program. High heritability figures indicate little need to develop extensive family information for wood specific gravity in advanced-generation breeding programs.

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