The DFRC Method for Lignin Analysis. 4. Lignin Dimers Isolated from DFRC-Degraded Loblolly Pine Wood

1998 ◽  
Vol 46 (2) ◽  
pp. 553-560 ◽  
Author(s):  
Junpeng Peng ◽  
Fachuang Lu ◽  
John Ralph
Keyword(s):  
Loblolly Pine ◽  
Pine Wood

Ignition and volatilization behavior of dust from loblolly pine wood

2014 ◽  
Vol 127 ◽  
pp. 117-123 ◽  
Author(s):  
G. Hehar ◽  
O. Fasina ◽  
S. Adhikari ◽  
J. Fulton
Keyword(s):  
Loblolly Pine ◽  
Pine Wood ◽  
Volatilization Behavior

scholarly journals Species comparison of the physical properties of loblolly and slash pine wood and bark

2017 ◽  
Vol 47 (11) ◽  
pp. 1495-1505 ◽  
Author(s):  
Thomas L. Eberhardt ◽  
Joseph Dahlen ◽  
Laurence Schimleck
Keyword(s):  
Physical Properties ◽  
Loblolly Pine ◽  
Pinus Elliottii ◽  
Dry Mass ◽  
Slash Pine ◽  
Species Comparison ◽  
Pine Wood ◽  
Living Tree ◽  
Breast Height ◽  
Whole Tree

Composition of the southern pine forest is now predominated by two species, loblolly pine (Pinus taeda L.) and slash pine (Pinus elliottii Engelm.), owing to fire suppression activities, natural regeneration on abandoned agricultural lands, and extensive planting. Comparison of the wood and bark physical properties of these pines is of interest in terms of the yields of usable biomass and, for the bark, its ecological functionality on a living tree. Trees from a species comparison study were used to generate wood and bark property data, on a whole-tree basis, and for stem disks collected at breast height. Models were constructed to explain the effect of relative height on wood and bark properties. When comparing the whole-tree data, slash pine wood (0.523 versus 0.498) and bark (0.368 versus 0.311) specific gravity values were higher, both offset by lower moisture contents; slash pine also produced a higher percentage of bark on a dry-mass basis (17% versus 12.5%). Unlike wood properties, bark properties showed significant between-species differences when determined at breast height alone, the exception being moisture content. In terms of yield, harvests of a green tonne of loblolly pine and slash pine would give approximately the same dry mass of wood, but slash pine provides more bark.

Resin Canals in Pinus Taeda: Longitudinal Canal Lengths and Interconnections Between Longitudinal and Radial Canals

IAWA Journal ◽  
1990 ◽  
Vol 11 (3) ◽  
pp. 227-238 ◽  
Author(s):  
C.A. LaPasha ◽  
E.A. Wheeler
Keyword(s):  
Pinus Taeda ◽  
Loblolly Pine ◽  
Pine Wood ◽  
Resin Canals ◽  
Movie Camera

Lengths of longitudinal resin canals in Pinus taeda (loblolly pine) wood were determined by 1) peeling offthe bark and measuring the canals, visible as white lines along the surface, to the nearest mm, and 2) photographing aseries ofcross sections (4000) ofknown thickness with a movie camera, and sub sequently using a film editor and frame counter to ca1culate lengths. The values yielded by the. two methods were not significantly different and indicate that the less time-consuming method of peeling and measuring lengths is as reliable as the cinematographic technique.

scholarly journals Liming Requirements of Greenhouse Peat-based Substrates Amended with Pine Wood Chips as a Perlite Alternative

2020 ◽  
Vol 30 (2) ◽  
pp. 219-230
Author(s):  
W. Garrett Owen ◽  
Brian E. Jackson ◽  
William C. Fonteno ◽  
Brian E. Whipker
Keyword(s):  
Loblolly Pine ◽  
Surface Characteristics ◽  
Wood Products ◽  
Wood Chips ◽  
Dolomitic Limestone ◽  
Pine Wood ◽  
Pine Wood Chips ◽  
African Marigold ◽  
Ph Range ◽  
Substrate Ph

Processed loblolly pine (Pinus taeda) wood has been investigated as a component in greenhouse and nursery substrates for many years. Specifically, pine wood chips (PWCs) have been uniquely engineered/processed into a nonfibrous blockular particle size suitable for use as a substrate aggregate. The objective of this research was to compare the dolomitic limestone requirements of plants grown in peat-based substrates amended with perlite or PWC. In a growth trial with ‘Mildred Yellow’ chrysanthemum (Chrysanthemum ×morifolium), peat-based substrates were amended to contain 0%, 10%, 20%, 30%, 40%, or 50% (by volume) perlite or PWC for a total of 11 substrates. Substrates were amended with dolomitic limestone at rates of 0, 3, 6, 9, or 12 lb/yard3, for a total of 55 substrate treatments. Results indicate that pH of substrates amended with ≥30% perlite or PWC need to be adjusted to similar rates of 9 to 12 lb/yard3 dolomitic limestone to produce similar-quality chrysanthemum plants. In a repeated study, ‘Moonsong Deep Orange’ african marigold (Tagetes erecta) plants were grown in the same substrates previously formulated (with the exclusion of the 50% ratio) and amended with dolomitic limestone at rates of 0, 3, 6, 9, 12, or 15 lb/yard3, for a total of 54 substrate treatments. Results indicate a similar dolomitic limestone rate of 15 lb/yard3 is required to adjust substrate pH of 100% peatmoss and peat-based substrates amended with 10% to 40% perlite or PWC aggregates to the recommended pH range for african marigold and to produce visually similar plants. The specific particle shape and surface characteristics of the engineered PWC may not be similar to other wood products (fiber) currently commercialized in the greenhouse industry, therefore the lime requirements and resulting substrate pH may not be similar for those materials.

scholarly journals Relative resistance to breaking of Pinus taeda and Pinus palustris

2018 ◽  
Vol 92 (4) ◽  
pp. 417-424 ◽  
Author(s):  
Cory Garms ◽  
Thomas J Dean
Keyword(s):  
Loblolly Pine ◽  
Modulus Of Elasticity ◽  
Longleaf Pine ◽  
Basal Area ◽  
Bending Moment ◽  
Pinus Palustris ◽  
Modulus Of Rupture ◽  
Pine Wood ◽  
Pine Tree ◽  
Crown Length

Abstract Patterns from hurricane damage indicate that longleaf pine is more windfirm than loblolly pine. Tree windfirmess has been attributed to many factors including species and material properties like wood strength and stiffness. Because longleaf pine wood is stronger and stiffer than loblolly pine wood, this study used static winching methodology to see if these properties account for differences in wind firmness by measuring bending force required to break stems (MMAX). Stress–strain diagrams were constructed for pulled trees to explore how they behave under increasing loads. Based on these diagrams, living trees appear to act as linear elastic materials as they experience increasing static lateral stress. As expected, longleaf pine stems were stiffer than loblolly pine wood in situ based on Young’s modulus of elasticity. Tree basal area was the best predictor of MMAX for both species, however, species had no significant effect on the maximum bending moment required to break tree stems of a given basal area for these trees under these conditions. The stiffness of the stems was higher for longleaf than loblolly as indicated by the modulus of elasticity, but the strength of the stems as indicated by the modulus of rupture was not significantly different between the species. Differences in the volumetric density of foliage, however, were consistent with the observed differences in stem failure between the species. For trees with the same diameter, loblolly pine had higher values of leaf area per unit crown length than longleaf pine.

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