Characterization of moisture content and specific gravity of branchwood and stemwood of Aningeria robusta and Terminalia ivorensis

Okai, Reynolds; Frimpong-Mensah, Kwasi; Yeboah, Dominic

doi:10.1007/s00107-002-0360-7

Cited by 20 publications

(15 citation statements)

References 1 publication

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“…Repola (2006) reported a widely observed negative correlation between growth rate and tree density and (citing work of Lindström 1996) suggested that it leads to a greater density for suppressed trees. Okai et al (2003) found the density of branch wood to be greater than that of stem wood for two tropical hardwood species. However, Swenson and Enquist (2008) suggested that branch wood-specific gravity was lower than stem wood-specific gravity, and that relationship was fairly consistent across species in their study.…”

Section: Discussionmentioning

confidence: 96%

A vertically integrated whole-tree biomass model

Planck

MacFarlane

2014

Trees

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Key message The density-integral approach worked well for estimating whole-tree and dominant stem vertical biomass profiles, and performed better than the constant-density approach for biomass prediction. Abstract Integrated whole-tree biomass equations are in great demand due to the simultaneous need to improve estimation of forest carbon stocks and to quantify the distribution of wood biomass within trees for estimating whole-tree utilization potential. Two approaches were used for modeling the vertical cumulative biomass profile of a whole tree from the ground to the top of the tree, including the dominant stem and branches: (1) a density-integral approach and (2) a constant-density approach. The models were developed from destructive sampling of 27 trees from a temperate hardwood forest in Michigan, USA. The species sampled were American beech (Fagus grandifolia Ehrh.) and sugar maple (Acer saccharum Marsh.). A mixedeffects modeling framework was used to account for withintree correlation in the biomass profiles. In general, the density-integral approach worked well for estimating whole-tree and dominant stem biomass profiles, and performed better than the constant-density approach. However, the results indicated that errors in the whole-tree volume estimation often overwhelmed differences in biomass prediction attributable to vertical tree density representation. Mixing species with different forms or density profiles could dilute benefits of the density-integral approach.

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Section: Discussionmentioning

confidence: 96%

A vertically integrated whole-tree biomass model

Planck

MacFarlane

2014

Trees

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“…They found that stemwood had higher SG than branchwood in the same plant. By contrast, Okai et al (2003) found that branchwood SG was 12% and 6% greater than stemwood SG in two Ghanaian species, but their sampling included inner, middle, and outer wood from large trees (2.5 m DBH) and large branches (≥10 cm) and included both sapwood and heartwood. Of 11 species grown in India, Bhat et al (1990) found branchwood had the same SG as stemwood in all but two species.…”

Section: Branchwood Versus Trunkwoodmentioning

confidence: 86%

Biomass Determination Using Wood Specific Gravity from Increment Cores

Wiemann¹,

Williamson²

2013

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The use of trade or firm names in this publication is for reader information and does not imply endorsement by the United States Department of Agriculture (USDA) of any product or service.The USDA prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410, or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. AbstractWood specific gravity (SG) is one of the most important variables used to determine biomass. Measurement of SG is problematic because it requires tedious, and often difficult, sampling of wood from standing trees. Sampling is complicated because the SG usually varies nonrandomly within trees, resulting in systematic errors. Off-center pith and hollow or decayed stems pose further problems in biomass estimation. When the pattern of variation within a tree is known, as it often is for a given species, the sampling procedure can be greatly simplified by sampling wood that approximates a mean value for the tree. Even when a pattern is not known, a representative approximation can produce reasonable estimates of SG. If whole above-ground woody biomass is required, corrections may be necessary to account for differences with height or in branches.

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“…With this loss of wood resources during logging in the forest, it was argued that the industry was not contributing its full potential to timber utilization. However, Okai, R. [6] pointed out that although wood residue could not be completely avoided during logging, it could be reduced significantly to minimize the pressure on the dwindling timber resource. Consequently, there have been several calls for the provision of solutions to the problem of wood wastage or residue accumulation [7,8].…”

mentioning

confidence: 99%

“…Amoah, M. et al [18] recently conducted studies on the physical and mechanical properties of branch, stem and root wood of iroko and emire tropical trees. The above studies [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] have been undertaken with the objective of utilizing the whole tree volume to reduce the pressure on the forest.…”

mentioning

confidence: 99%