Accuracy using xylometry of log volume estimates for two tree species in Turkey

Özçelık, Ramazan; Wiant, Harry V.; Brooks, John R.

doi:10.1080/02827580801995323

Cited by 17 publications

(4 citation statements)

References 8 publications

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“…A short length of sections, the top and bottom diameter ratio close to 1 for each section, and errors of various sections having different signs (as they actually cancel out), cause the resulting differences in the total tree volume obtained using different equations to differ from the true values by a maximum of ±1%. Such research dealing with empirical accuracy of sectional equations (applied to real trees, stems or bolts, not theoretical, applied to solids of revolutions, such as paraboloid, neiloid or cone) are rather scarce [36], but available, mostly in classical textbooks on forest mensuration [12,[37][38][39]. This is because of difficulties in the determination of the true (real) volume of trees, which requires using fluid (water) displacement methods (xylometry) to get reference values.…”

Section: Statisticsmentioning

confidence: 99%

Comparison of Fixed- and Mixed-Effects Approaches to Taper Modeling for Scots Pine in West Poland

Bronisz

Zasada

2019

Forests

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Diameter measurements along the stem, which are the basis for taper models, usually have a hierarchical structure. Mixed-effects models, where fixed and random effects are distinguished, are a possible solution for this type of data. However, in order to fully absorb the potential of this method, random effects prediction, which requires additional measurements (diameter along stem), is recommended. This article presents a comparison of various fitting methods (mixed- and fixed-effects model approaches) of the variable-exponent taper model created by Kozak for determining the outside bark diameter along the stem and predicting the tree volume of Scots pine trees in west Poland. During the analysis, it was assumed that no additional measured data were available for practical use; therefore, for the mixed-effects model approach, fixed effects prediction without random effects was applied. Both fitting strategies were compared based on modeling and an independent validation data set. The comparison of mixed- and fixed-effects fitting strategies for the diameter along the stem indicated that the taper model fitted using the mixed-effects model approach better fit the data. Moreover, the error rate for the total tree volume prediction for the independent data set was lower for the mixed-effects model solution than for the fixed-effects one.

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Section: Statisticsmentioning

confidence: 99%

Comparison of Fixed- and Mixed-Effects Approaches to Taper Modeling for Scots Pine in West Poland

Bronisz

Zasada

2019

Forests

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“…Other bark properties such as density and degree of structuring also show a correlation with fire tolerance, but their importance in determining the extent of fire tolerance appears to be secondary to the influence of bark thickness and bark moisture (Figure 7). Bark density in terms of mass per volume was measured by xylometric methods [45]. Surface structuring of the bark is depicted in Figure 4.…”

Section: Resultsmentioning

confidence: 99%

Is a Forest Fire a Natural Disaster? Investigating the Fire Tolerance of Various Tree Species—An Educational Module

Speck,

Speck

2024

Biomimetics

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Wildfires are unplanned conflagrations perceived as a threat by humans. However, fires are essential for the survival of fire-adapted plants. On the one hand, wildfires cause major damage worldwide, burning large areas of forests and landscapes, threatening towns and villages, and generating high levels of air pollution. On the other hand, fire-adapted plants (pyrophytes) in the fire landscapes of the Earth are able to survive exposure to heat (e.g., because of their thick bark, which protects their living tissue) and benefit from fire directly (e.g., fire initiates cone opening and seed release) or indirectly (e.g., fewer competing plants of fire-sensitive species remain, seeds germinate in the ash-fertilized soil). We present the experimental set-up and results of a fire experiment on bark samples used as a basis to assess the fire tolerance of various trees. Fire tolerance is defined as the ability of a tree to survive a surface fire (up to 200 °C and 5 min duration). The measure of the fire tolerance for a tree species is the time taken for the vascular cambium under the insulating bark to reach the critical temperature of 60 °C. Within an educational module, we provide worksheets for teachers and students enabling them to analyze the fire tolerance of various tree barks.

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“…The volumes of the wood discs were measured using a xylometer with overflow device as described by (Berendt et al 2021a). In studies, it has been mentioned that the fundamental water displacement technique leads to real volume and is therefore often used to evaluate the accuracy of scaling formulas (Filho et al 2000;Özçelik et al 2008;Akossou et al 2013). The moisture content (MC) of all wood discs was above the fiber saturation point (defined as MC > 30%) and therefore no wood swelling occurred during the immersion.…”

Section: Data Collectionmentioning

confidence: 99%

Estimation of Scots pine bark biomass delivered to the wood industry in Northern Germany

Berendt,

Bajalan,

Wenig

et al. 2023

Central European Forestry Journal

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Scots pine (Pinus sylvestris L.) is the most widely distributed pine species in the world. In Germany, as in many other European countries, it is a very important species both culturally and economically. Few studies have focused on bark volumes being delivered to the wood industry together with the roundwood, being potentially a valuable resource for material or energetic utilization. Therefore, logs from six different forest sites were collected and bark variables including double bark thickness (DBT) in three different categories, diameter, and bark damage (as a degree of miss-DBT) in three different categories, diameter, and bark damage (as a degree of missing bark) were measured and analyzed in order to model bark volume (Vbark) and bark mass (Mbark). The correlation analysis using Pearson’s method showed that the highest correlation coefficients were observed from the correlation between DBT and Vbark, as well as between DBT and Mbark. Also, results demonstrated that with DBT greater than 20 mm, the percentage of Vbark exceeded 20%. Finally, different linear regression models were recommended to predict Vbark and Mbark based on the other variables. The results of this study can be used in different wood industries in order to predict bark volume and bark mass of e.g. truckloads or roundwood stacks.

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Accuracy using xylometry of log volume estimates for two tree species in Turkey

Cited by 17 publications

References 8 publications

Comparison of Fixed- and Mixed-Effects Approaches to Taper Modeling for Scots Pine in West Poland

Comparison of Fixed- and Mixed-Effects Approaches to Taper Modeling for Scots Pine in West Poland

Is a Forest Fire a Natural Disaster? Investigating the Fire Tolerance of Various Tree Species—An Educational Module

Estimation of Scots pine bark biomass delivered to the wood industry in Northern Germany

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