Equations for Estimating Bark Volume and Thickness of Commercial Trees in British Columbia

Volume and thickness of bark were studied for 32 species groups of British Columbia. Over 32,000 trees constituted the data base to derive bark volume equations. Because of its simplicity and good predictive power, the equation of Vb = a'HTbDBHcBTd is recommended for bark volume prediction. The possibility to develop bark taper equations and to estimate bark thickness at any given height above breast height were also investigated.

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Bark Thickness and Bark Volume in Southwestern Oregon Douglas-Fir

Western Journal of Applied Forestry ◽

10.1093/wjaf/5.1.5 ◽

1990 ◽

Vol 5 (1) ◽

pp. 5-8 ◽

Cited By ~ 11

Author(s):

Douglas A. Maguire ◽

David W. Hann

Keyword(s):

Pseudotsuga Menziesii ◽

Douglas Fir ◽

Bark Thickness ◽

Breast Height ◽

Taper Equation ◽

Taper Equations ◽

Height Predictions

Abstract A segmented polynomial taper equation for southwestern Oregon Douglas-fir (Pseudotsuga menziesii) predicts double bark thickness (dbt) at any point above breast height. Below breast height predictions assume conformity to a neiloid frustrum. The equations facilitate estimation of inside bark diameter (dib) given outside bark (dob) measurements. Bark volume and bark biomass can also be estimated when supplemented with existing dib taper equations developed for southwestern Oregon. West J. Appl. For. 5(1):5-8.

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Integrated Systems for the Estimation of Tree Taper and Volume

Canadian Journal of Forest Research ◽

10.1139/x73-013 ◽

1973 ◽

Vol 3 (1) ◽

pp. 90-94 ◽

Cited By ~ 31

Author(s):

J. P. Demaerschalk

Keyword(s):

Integrated Systems ◽

Total Height ◽

Breast Height ◽

Taper Equations ◽

Diameter Outside Bark ◽

Volume Equations

The desirability and the advantages of deriving taper equations from existing volume equations are discussed. It is demonstrated that the most common types of volume equations can be converted to compatible taper equations. These mathematical stem profile expressions yield tree volumes for any desired stump height and top diameter outside bark from inputs of diameter breast height outside bark and total height.

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Potentials for Controlling Bark Percentage of the Commercial Tree Species of British Columbia

The Forestry Chronicle ◽

10.5558/tfc57156-4 ◽

1981 ◽

Vol 57 (4) ◽

pp. 156-161 ◽

Cited By ~ 3

Author(s):

J. Harry G. Smith ◽

A. Kozak

Keyword(s):

British Columbia ◽

Tree Species ◽

Statistical Significance ◽

Tree Improvement ◽

Bark Thickness ◽

Guide Tree ◽

Breast Height ◽

Improvement Programs ◽

Standard Deviations

Diameters inside and outside bark from 13 sections were used to define variation in bark percentages for 33 844 trees representing 28 major groups of the commercial tree species of British Columbia. The range of age, height, dbh, and dbh/height associated with each group was determined. Statistical significance of effects of these factors and of up to 12 inventory zones was determined for double bark thickness as a percentage of dbh. Bole bark volumes were compared with wood volumes for trees exceeding two standard deviations of bark percentage at breast height. Thick barked trees were more common and a few have equal portions of wood and bark. Our description of the characteristics of the trees with least or most bark should help guide tree improvement programs. Identification of the extent to which stand factors can influence average bark characteristics may help timber managers grow trees of desired bark proportions.

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Estimating stump volume, stump inside bark diameter and diameter at breast height from stump measurements

The Forestry Chronicle ◽

10.5558/tfc68623-5 ◽

1992 ◽

Vol 68 (5) ◽

pp. 623-627 ◽

Cited By ~ 3

Author(s):

Antal Kozak ◽

Stephen A. Y. Omule

Keyword(s):

British Columbia ◽

Tree Species ◽

Prediction System ◽

Diameter At Breast Height ◽

Breast Height ◽

Species Groups ◽

Stand Conditions

Equations were derived for estimating stump volume, stump inside bark diameter at any given height from ground and diameter at breast height from measured stump height and stump inside bark diameter. The equations were tested on 33 British Columbia commercial tree species groups and the results of four species groups are presented in this paper. This prediction system will play an important role in "waste" or "residue" surveys in British Columbia and in reconstructing the initial stand conditions by estimating diameter at breast height.

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Estimating juvenile tree volumes for provenance and progeny testing

Canadian Journal of Forest Research ◽

10.1139/x77-042 ◽

1977 ◽

Vol 7 (2) ◽

pp. 335-342 ◽

Cited By ~ 4

Author(s):

M. Kovats

Keyword(s):

British Columbia ◽

Lodgepole Pine ◽

Douglas Fir ◽

Progeny Testing ◽

Diameter At Breast Height ◽

Breast Height ◽

Volume Equations

The development of a tree volume-estimating method for juvenile trees ranging from 1 to 10 m in height is described and application is suggested. Volume equations are given for coastal Douglas fir (Pseudotsugamenziesii (Mirb.) Franco), lodgepole pine (Pinusconiorta Dougl.), and two spruce species (Piceaengelmannii Parry and Piceaglauca (Moench) Voss) of British Columbia. The method features flexible diameter reference height and a height limit, beyond which the conventional diameter at breast height and volume estimating methods apply.

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Fitting Taper Equations from Standing Trees

The Forestry Chronicle ◽

10.5558/tfc60157-3 ◽

1984 ◽

Vol 60 (3) ◽

pp. 157-161 ◽

Cited By ~ 4

Author(s):

C. A. James ◽

A. Kozak

Keyword(s):

British Columbia ◽

Standing Tree ◽

Bark Thickness ◽

Prediction Function ◽

Standing Trees ◽

Commercial Species ◽

Thickness Prediction ◽

Different Diameters ◽

Taper Equations ◽

Taper Model

Taper equations from standing trees were developed for 32 major groups of the commercial species of British Columbia by applying outside bark data to an accepted taper model (the Whole-Bole system). Tests of this model on all groups show that estimates of volume, diameters inside bark at different heights, and heights for different diameters are sufficiently accurate and precise for practical use. In some cases, standing tree estimates are more reliable than those produced from the inside bark taper equations currently used in British Columbia. Including a bark thickness prediction function in the model would improve the reliability of estimation.Taper data can be obtained from standing trees accurately and inexpensively with a Barr & Stroud dendrometer. Because of this method of data collection is more efficient than felled tree measurement, these standing tree taper equations have great potential for use in local situations and where nondestructive samples are required.

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A Debris Flow Basin and Event Data Base Format With An Example Data Set From southwestern British Columbia

10.4095/133393 ◽

1992 ◽

Author(s):

O Hungr ◽

L E Jackson

Keyword(s):

British Columbia ◽

Debris Flow ◽

Data Base ◽

Event Data ◽

Data Set

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Modelling Bark Thickness of Norway Spruce (Picea abies Karst)

South-east European forestry ◽

10.15177/seefor.19-17 ◽

2019 ◽

Vol 10 (2) ◽

pp. 125-135

Author(s):

Jusuf Musić ◽

Velid Halilović ◽

Jelena Knežević ◽

Admir Avdagić ◽

Aida Ibrahimspahić ◽

...

Keyword(s):

Norway Spruce ◽

Bosnia And Herzegovina ◽

Timber Harvesting ◽

Bark Thickness ◽

Optimal Model ◽

Breast Height ◽

Starting Point ◽

Mean Diameter ◽

The Mean ◽

Actual Method

Background and Purpose: Bark thickness and its share in the volume of roundwood are the most important characteristics of the bark, particularly in the process of timber harvesting, and during scaling of processed logs. Therefore it is very important to have at disposal relatively accurate data regarding these characteristics of bark for particular tree species. The main goal of this paper is to investigate the thickness of the bark and its share in the volume of roundwood of Norway spruce. Materials and Methods: The research was carried out in the area of the Canton 10 of the Federation of Bosnia and Herzegovina and it encompassed 393 trees of Norway spruce from 10 cm to 115 cm of thickness at breast height. Measuring of the mean diameter and double thickness of bark was conducted by section method. In total, 4,647 diameters and bark thicknesses were measured in different relative lengths of stems or in average 10.6 measurements per one stem. Results: As an optimal model for the evaluation of double thickness of the bark of Norway spruce depending on mean diameter of roundwood the function with designated determination coefficient of 0.7142 was selected. The obtained results have confirmed the previously defined relations of investigate characteristics, which are as following: a) with the increase of mean diameter of roundwood (section) double bark thickness is increased from 9.26 mm (thickness class 12.5 cm) to 31.65 mm (thickness class 92.5 cm); b) with the increase of mean diameter of roundwood the share of bark in its volume decreased from 14.26% (thickness class 12.5 cm) to 6.73% (thickness class 92.5 cm). Conclusions: By the actual method of estimating bark thickness or the share of bark in the volume of roundwood of Norway spruce in the forestry of the Federation of Bosnia and Herzegovina a significant error was created which increases with the increase of mean diameter. The obtained results point to the necessity of investigation of these bark characteristics in Bosnia and Herzegovina and represent an inevitable starting point for making adequate tables of bark thickness and its percentage share in the volume of roundwood of Norway spruce.

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