scholarly journals Determination of relationship stump diameter - diameter at breast height for sessile oak (Quercus petraea (Matt.) Liebl) stands in Northern Marmara Region

2020 ◽  
pp. 25-34
Author(s):  
Emrah ÖZDEMİR ◽  
Abbas ŞAHİN ◽  
Gafura AYLAK ÖZDEMİR
Keyword(s):  
Quercus Petraea ◽  
Marmara Region ◽  
Diameter At Breast Height ◽  
Sessile Oak ◽  
Breast Height ◽  
Stump Diameter

scholarly journals Unexplained Relationships of Height-Diameter of Three Tree Species in a Tropical Forest.

2013 ◽  
Vol 6 (3) ◽  
pp. 196-204
Keyword(s):  
Tree Species ◽  
Coefficient Of Determination ◽  
Multivariate Models ◽  
Forest Reserve ◽  
Permanent Sample Plots ◽  
Tree Distance ◽  
Diameter At Breast Height ◽  
Breast Height ◽  
Bivariate Models

Associations between bivariate variables relative to the unexplained relationships of height-Dbh (diameter at breast height) models were investigated. Seven permanent sample plots measuring 40m by 250m at Omo Forest Reserve were used to assess the relationships between height and diameter at breast height of three tree species as affected by the variables of neighbouring trees. The result showed differences in the coefficient of determination of the bivariate models and multivariate models. The models arrived at for each of the species and for the bivariate models are: Scottelia coriaceae: Ht = 2.59 + 0.473D+ 0.0012D2 for 5cm ≤ D ≤100cm (R2 = 0.70) Sterculia rhinopetala: Ht = 5.96 + 0.467D+ 0.00296D2 for 5cm ≤ D ≤100cm (R2 = 0.77) Strombosia pustulata: Ht = 2.02 + 0.722D+ 0.00581D2 for 5cm ≤ D ≤ 60cm (R2 = 0.81) Where both Ht and D are height and Diameter at breast height. While on the other hand the multivariate models that considered the effect of neighbouring trees are: Scottelia coriaceae: 2 1 2 3 4 Ht = 3.74 + 0.41x −1.14x + 0.205x +1.278x (R = 0.723) Sterculia rhnopetala: 2 1 2 3 4 Ht = 6.18 + 0.2601x +1.163x + 0.438x − 0.442x (R = 0.608) Strombosia pustalata: 2 1 2 3 4 Ht = 6.84 + 0.399x − 0.318x − 0.138x − 0.838x (R = 0.650) x1 = diameter at breast height, x2 = Mean neighbouring tree distance, x3 = Frequency of the neighbouring tree and x4 = Position of the crown.

scholarly journals Fuel and lubricants consumption during timber felling and processing in the area of p.j. Forest office „Zavidovići“

2019 ◽  
Vol 143 (7-8) ◽  
pp. 345-346
Author(s):  
Velid Halilović ◽  
Amer Kupusović ◽  
Jelena Knežević ◽  
Dževada Sokolović ◽  
Muhamed Bajrić ◽  
...  
Keyword(s):  
Fuel Consumption ◽  
Working Conditions ◽  
Main Tool ◽  
Tree Height ◽  
Forest Harvesting ◽  
Precise Determination ◽  
Volumetric Method ◽  
Sessile Oak ◽  
Breast Height

Chainsaw is the main tool for work in a phase of wood felling and processing of forest harvesting in BiH. The aim of the research was to determine fuel and lubricant consumption of the chainsaws Husqvarna 365 and Dolmar PS – 7310 in the phase of felling and processing of wood assortments at the area of P.J. Forest Office „Zavidovići“, forest compartment 203. The volumetric method was applied for the measurement of fuel and lubricants consumption, with precise determination of fuel and lubricant quantity in chainsaw tanks. In total 140 trees of the sessile oak were felled (70 trees with chainsaw Husqvarna 365 and 70 trees with chainsaw Dolmar PS – 7310) during the research. The diameter at the breast height of felled trees ranged from 15 to 84 cm, while tree height ranged from 10,3 to 37,2 m. The total volume of processed assortments was 180,11 m<sup>3</sup>. The average fuel consumption per m<sup>3</sup> processed assortments was 0,306 L/m<sup>3</sup> for trees felled by chainsaw Husqvarna 365 which is for 0,042 L/m<sup>3 </sup>larger in comparison to chainsaw Dolmar PS – 7310 with average fuel consumption of 0,264 L/m<sup>3</sup>. The average lubricant consumption per m<sup>3</sup> processed assortments was 0,102 L/m<sup>3 </sup>for trees felled by chainsaw Husqvarna 365 which is for 0,012 L/m<sup>3</sup> larger in comparison to chainsaw Dolmar PS – 7310 with average lubricant consumption of 0,09 L/m<sup>3</sup>. Considering conducted research it can be assumed that there are differences in fuel and lubricant consumption between this two type of chainsaws for considered working conditions, but differences are not statistically significant.

scholarly journals Comparison of Volumes Estimated from Breast Height and Stump Diameters: Application to Tectona grandis Data

2020 ◽  
Vol 66 (5) ◽  
pp. 551-555
Author(s):  
Onyekachi Chukwu ◽  
Friday N Ogana ◽  
Juliet U Nwatu
Keyword(s):  
Growth Model ◽  
Tectona Grandis ◽  
Information Criterion ◽  
Volume Estimation ◽  
Stem Volume ◽  
Model Assessment ◽  
Significance Level ◽  
Diameter At Breast Height ◽  
Breast Height ◽  
Stump Diameter

Abstract Models estimating tree volume from stump diameter are important forest-management tools when volume estimation is needed postharvest, and dbh values are unavailable, for example the incidence of timber trespass. However, the use of stump diameter as the only independent variable for predicting tree volume has been limited. Therefore, in this article, stump diameter was used to estimate stem volume of Tectona grandis Linn. f, and this was compared with volume estimated from diameter at breast height. Five functions were considered each for the two stem diameters: simple linear, semilogarithmic, zero-intercept, power, and growth. Model assessment was based on least values of the root mean square error and Akaike information criterion. The results showed that the growth model had the best overall performance for both sets of volume models. A paired-sample t-test was used to compare volume estimated by stump diameter and volume estimated by diameter at breast height at 5 percent significance level. The results showed that there were no significant differences (P = .087) between timber volumes estimated from both stem diameters. Therefore, both diameters can be used interchangeably for modeling tree volume.

scholarly journals The results of an 18–year old beech trees (Fagus sylvatica L.) provenance trial in the Łobez Forest District

2013 ◽  
Vol 74 (3) ◽  
pp. 197-203
Author(s):  
Wojciech Kowalkowski
Keyword(s):  
Block Design ◽  
Basal Area ◽  
Experimental Plot ◽  
Site Location ◽  
Diameter At Breast Height ◽  
Breast Height ◽  
Natural Range ◽  
Fagus Sylvatica L ◽  
Forest District

Abstract The experimental area is located in the Węgorzyno Forest Sub-District, Łobez Forest District. 29 Polish provenances of beech from their natural range were growth in a completely randomised block design with four replications. In 2010, after the end of the growing season, measurements were carried out on the experimental plot, including: determination of the survival rate and the diameter at breast height, and height of trees. Moreover, the total basal area and the total volume were calculated. Using ANOVA, statistically significant differences between provenances were apparent for four of the five traits measured; all except diameter at breast height. Provenances characterised by high values for the analysed traits were considered the best adapted to the habitat conditions in the experimental plot, while provenances reaching low values were considered unsuitable for use under the conditions similar to those at the trial site location

scholarly journals Wedge prism as a tool for diameter and distance measurement

2008 ◽  
Vol 54 (No. 3) ◽  
pp. 121-124 ◽  
Author(s):  
L. Šálek ◽  
D. Zahradník
Keyword(s):  
Basal Area ◽  
Distance Measurement ◽  
Stem Volume ◽  
Diameter At Breast Height ◽  
Breast Height ◽  
Standing Trees ◽  
Wedge Prism ◽  
Non Destructive

The wedge prism, which is generally used for the measurement of basal area in diameter at breast height, is also a tool for the measurement of distance as well as for the measurement of diameters at a certain height of the stem, in the upper stem. Measurements using the wedge prism are based on the same principle as measurements using Bitterlich mirror relascope. This method is appropriate for non-destructive determination of stem volume. Moreover, the wedge prism can be used for the sorting of logs in standing trees when the small end of expectant assortment has to be known. As the wedge prism is a common tool for foresters, its usage seems to be larger than only the measurement of basal area.

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