Quality of wood in the stands of poplar clones

Petráš, Rudolf; Mecko, J.; Nociar, V.

doi:10.17221/791-jfs

Cited by 4 publications

(6 citation statements)

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“…y The volume of raw timber by assortments for industrial processing VS (m 3 ha -1 ) (Petráš et al, 2007;2008a). y Gross financial yield only from the production of timber assortments HV (€ ha -1 ) (Petráš et al, 2008b).…”

Section: Criteria For Felling Maturity Of Poplar Clones Grown For Enementioning

confidence: 99%

“…While stands of poplar clones constitute homogeneous tree sets (Petráš et al, 2010), the structure of essential parts such as the stem, tree crown and branches, or even of their main mechanical fractions such as wood and bark is very heterogeneous. Their composition varies with the lifelong development of the stands (Petráš et al, 2007(Petráš et al, , 2008a. Smallwood and bark dominate in the early growth stages, but with increasing age, the proportion of these parts significantly reduces.…”

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confidence: 99%

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Criteria For Felling Maturity Of Poplar Clones Grown For Energy Use

Petráš

Mecko

Petrášová

2015

Acta Regionalia Et Environmentalica

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Poplar clones reach a big advantage over other forest tree species in the production of large amounts of above-ground biomass in a relatively short time. To increase the efficiency of production during their short life cycle, it is necessary to optimize age of their felling maturity. It should be carried out in the stands age when its average production is highest. Mathematical models of yield tables were used to derive this production. Above-ground biomass production was expressed in natural units, volume (m3 ha−1) and the capacity of calorific value (GJ ha−1), but also in financial yield (€ ha−1) from the sale of timber assortments including energy chips from smallwood. In terms of financial yield, Robusta stands are mature between 23 and 35 years and I-214 stands between 18 and 32 years. Main financial yield per year, on average 200–1900 € ha−1, is expected from the production of assortments designed for classic industrial processing. Its increase by 50 to 100 € ha−1 is expected to be achieved by supplemental smallwood processing to energy chips. In terms of volume production and capacity of combustion heat, stands are mature about 5–7 years earlier.

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Section: Criteria For Felling Maturity Of Poplar Clones Grown For Enementioning

confidence: 99%

mentioning

confidence: 99%

Criteria For Felling Maturity Of Poplar Clones Grown For Energy Use

Petráš

Mecko

Petrášová

2015

Acta Regionalia Et Environmentalica

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“…Models of stand assortment tables determine the structure of assortments V% for poplar stands (Petráš et al 2008a) in dependence on their mean diameter d v , quality qua and damage dam to stands according to the relation:…”

Section: Models Of Assortment Yield Tablesmentioning

confidence: 99%

Value production of poplar clones

Petráš¹,

Mecko²,

Nociar³

2008

J. For. Sci.

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Quality production of wood raw materials with maximal use of natural factors and minimum costs of human labour is the main aim of forest production with regulated management, it means forest cultivation in its whole production framework. Knowledge of the value production of forest stands exists on two levels according to known literary sources. The first level is the individual financial valuation of the stocks of concrete stands with their mensurational characteristics, and the second level represents knowledge in this field for the lifelong development of forest stands and their total production in the form of value yield tables. Gross and net financial yield may be expressed, similarly like traditional yield tables or assortment yield tables, in dependence on the age and site index of stands.In published works the knowledge of the value production on both levels is available. Schroeder and Seemann (1987) reviewed the production of Douglas fir, spruce and pine in timber reserve, proportion of assortments, and gross and net yield. They based their own value calculations on standing resources of the studied tree species, their dimensional sorting, financial valuation of assortments and costs of logging operations. Bartelheimer (1991) calculated the gross and net yield of quality oak stands using the average prices of timber and costs of logging operations in Bavaria. Brandl (1986) calculated net yield for beech stands tended by various methods. Brandl (1989) dealt with the issue of net yield again, but from the whole forest operations, when he analyzed the results of economic activities of selected forest enterprises. Based on their economic records he derived such a minimum height of total mean increment in m 3 that the net yield of the whole forest production, including wood production, is still positive. Bergel (1986) described the procedure of derivation of value yield tables for Douglas fir with various tending intensity, yield level and rotation period. He used yield and assortment tables for their construction. He used the costs of logging and other silvicultural operations, including overhead costs, from the data of forest enterprises. Bachmann (1967) The results of research on the value production of the stands of poplar clones Robusta and I-214 carried out in Slovakia are presented. Models of value yield tables were constructed separately for each clone. The models simulate gross and net financial yield of wood production in dependence on the site index and age of stand. They were constructed on the basis of the models of assortment yield tables, timber prices according to assortments and the models of own costs of timber felling and processing. The clone I-214 produces a faster and higher proportion of thicker assortments of average and below-average quality, and therefore it has the higher value production at a younger age only. Robusta produces smaller diameter but higher quality assortments and has the higher value production only at an older age. The site index of the stand is the most important ...

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“…They give the structure of assortments V% for poplar stands (Petráš et al 2008) in dependence on their mean diameter d v , quality qua and damage dam to stands according to the relation:…”

Section: Models Of Stand Assortment Tablesmentioning

confidence: 99%

“…In the last years models of the production of poplar clones Robusta and I-214 were completed. Mecko (2001, 2005) processed their volume production into yield tables, and the quality of production started with the construction of tree and stand assortment tables (Petráš, Mecko 2007;Petráš et al 2008) and resulted in assortment yield tables.The aim of the paper is to present the methodology and the results of the construction of the models of assortment yield tables for poplar clones Robusta and I-214. …”

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confidence: 99%

Models of assortment yield tables for poplar clones

Petráš¹,

Mecko²,

Nociar³

2008

J. For. Sci.

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ABSTRACT:The results of research on the production of raw timber assortments for the stands of poplar clones Robusta and I-214 in Slovakia are presented in this paper. Models of assortment yield tables were constructed, separately for each clone, in dependence on the yield class and stand age. The construction was based on the models of yield tables, stand assortment tables, models of external quality and damage to stems. Robusta clone produces by about 15-20% higher proportions of the highest quality assortments than I-214 clone. I-214 clone produces faster and higher proportions of average-and below-average quality assortments. their knowledge we may state that the methodologies of the construction of assortment tables accept mostly only dimensional sorting, where individual logs are divided according to mean diameter into diameter classes with the diameter 5 cm or 10 cm. Only occasionally are very simplified criteria used for the quality of stems or the crown parts of trees or possibly for their damage by rot. Dimensional sorting is justified in the above-mentioned cases by the fact that coniferous tree species such as spruce, fir and pine, which prevail in many countries, show very small differences in the quality of stems and prevailing assortments, frequently almost 90% of their volume, are saw logs. In this case it is sufficient to classify them into diameter classes.In Slovakia relatively great attention is paid also to quality sorting when for logs quality characteristics of wood are also considered, for example knots, decays, false heartwood, curvature, twisted growth of wood fibres, etc. Based on the original material of empirical sorting models of tree and stand assortment tables for 8 commercially important tree species were constructed, namely for spruce, fir, pine, oak and beech Nociar (1990, 1991) and for larch, hornbeam and birch Mecko et al. (1993). By connection of the above-mentioned models with the models of yield tables (Halaj et al. 1987;Halaj, Petráš 1998) assortment yield tables (Petráš et al. 1996) were constructed. In the last years models of the production of poplar clones Robusta and I-214 were completed. Mecko (2001, 2005) processed their volume production into yield tables, and the quality of production started with the construction of tree and stand assortment tables (Petráš, Mecko 2007;Petráš et al. 2008) and resulted in assortment yield tables.The aim of the paper is to present the methodology and the results of the construction of the models of assortment yield tables for poplar clones Robusta and I-214. MATeRiAlS ANd MeThodSAssortment yield tables show the structure of assortments, particularly their volume in m 3 or the proportion in % of the whole standing volume S(m 3 ,%) in dependence on the stand site index si and age t according to the relation:Assortment yield tables of poplar clones were constructed by the method of simulation from the models of yield tables, stand assortment tables, models of the quality and damage to stands. Models of yield tablesThey show the d...

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Quality of wood in the stands of poplar clones

Cited by 4 publications

References 1 publication

Criteria For Felling Maturity Of Poplar Clones Grown For Energy Use

Criteria For Felling Maturity Of Poplar Clones Grown For Energy Use

Value production of poplar clones

Models of assortment yield tables for poplar clones

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