Production of Douglas-Fir in the Czech Republic based on national forest inventory data

Podrázský, Vílém; Čermák, R.; Zahradník, D.; Kouba, J.

doi:10.17221/48/2013-jfs

Cited by 36 publications

(24 citation statements)

References 9 publications

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“…Douglas fir and alder woods were chosen intentionally for the scope of this research. These species are relevant representatives of conifer and deciduous wood species with similar densities (Table 1) (Podrázský et al 2013). …”

Section: Methodsmentioning

confidence: 99%

Comparison of Stiffness and Strength Properties of Untreated and Heat-Treated Wood of Douglas Fir and Alder

Borůvka¹,

Zeidler²,

Holeček³

2015

BioResources

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This paper investigates the effect of heat treatment temperature on the stiffness and strength properties of Douglas fir (Pseudotsuga menziesii Franco) and common alder (Alnus glutinosa Gaertn.) woods. Two temperatures of heat treatment were used: 165 and 210 °C. The effects of dynamic elasticity modulus, static elasticity modulus, impact toughness, bending strength, and density were evaluated. It is already understood that the mechanical properties, primarily the bending strength, decreases with increasing temperature. In contrast to the favorable stability in shape and dimension that was achieved, the changes in the woods' properties with temperature were mostly negative. Higher heat treatment temperatures corresponded with lower stiffness and strength properties. For higher temperature treatments, above 200 °C, deterioration of the tested properties was noticable as a result of the significant changes in the wood chemical structure. Even the positive effect of the equilibrium moisture decrease was not able to counterbalance the unfavorable changes. Moreover, it was observed that as the hemicellulose content is higher in alder wood, density, static bending strength, and toughness all decreased steadily at high temperatures, compared to Douglas fir wood.

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Section: Methodsmentioning

confidence: 99%

Comparison of Stiffness and Strength Properties of Untreated and Heat-Treated Wood of Douglas Fir and Alder

Borůvka¹,

Zeidler²,

Holeček³

2015

BioResources

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“…menziesii was found to be suitable for European forests [1,2]. High growth rates [3][4][5], good wood quality [6], resistance against fungal pathogens and low numbers of pests and diseases [7] are factors that have contributed to the current widespread distribution of Douglas fir in European forests [8]. This tree's value in the coming years is likely to increase further [9,10].…”

Section: Introductionmentioning

confidence: 99%

Climate Response of Douglas Fir Reveals Recently Increased Sensitivity to Drought Stress in Central Europe

Vejpustková

Čihák

2019

Forests

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Research Highlights: In Central Europe, Douglas fir became more responsive to summer drought in recent years. Background and Objectives: Until now, Douglas fir has been considered a tree species resistant to drought. However, how Douglas fir will be able to cope with the increasing frequency and intensity of summer heat waves remains a question. The long-term variability in the climate response of Douglas fir in Central European conditions has not been fully explored. The aim of the study was to identify climatic factors controlling the stem radial growth of Douglas fir and Norway spruce, and to examine the temporal changes in tree responses to key climatic variables related to drought stress. Materials and Methods: We analysed the pattern of the climate–growth relationship of Douglas fir and Norway spruce, growing in mixed stands distributed between 260 and 600 m above sea level, which corresponds with the altitudinal zone of intensive spruce dieback in the Czech Republic. Nine-site tree-ring-width chronologies were developed for each tree species. Pointer year analysis and correlation analysis in combination with principal component analysis were used to identify climatic factors limiting their growth. Moving correlation function was computed to assess temporal changes of the climate–growth relationship. Results: In the entire 1961–2015 period, growth of both species was positively related to summer precipitation. The response to temperature differed between species. While spruce was negatively affected by the temperatures in summer months, the increments of Douglas fir were positively correlated with the temperatures in February and March. However, moving correlation analysis revealed recently increasing sensitivity to summer temperatures also for Douglas fir. Higher responsiveness of Douglas fir to drought was also revealed by the increasing frequency of negative pointer years in the 2003–2015 period. Conclusions: The recommendations of Douglas fir as a suitable alternative tree species for declining spruce stands at lower altitudes must be regarded with caution.

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“…Douglasfir is the most popular and utilized introduced tree species in Europe, including in the Czech Republic, and it has the highest production potential among the native and introduced tree species [3]. It very often represents planted and cultivated species, especially in France, Germany, Italy and the United Kingdom [4].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Wood Quality of Douglas Fir and Spruce from Afforested Agricultural Land and Permanent Forest Land in the Czech Republic

Zeidler¹,

Borůvka²,

Schönfelder³

2017

Forests

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This study compares the quality of wood from two distinct sites in the Czech Republic-from former afforested agricultural land and forest land. We compared the properties of Norway spruce wood (Picea abies Karst.) and Scots pine wood (Pinus sylvestris L.), the most important domestic tree species, to Douglas fir (Pseudotsuga menziesii (Mirbel) Franco), a North American tree species and a potential substitute for the domestic spruce. Wood density, modulus of elasticity (MOE), modulus of rupture (MOR) and impact bending strength were the properties tested that were used for comparing tree species. Without taking into consideration the site, the highest density values from the tested tree species were obtained for Douglas fir (0.568 g·cm −3 ), followed by the pine (0.508 g·cm −3 ) and the spruce (0.463 g·cm −3 ). The Douglas fir also dominated in the remaining assessed properties, whilst the influence of site was not confirmed, with the exception of MOE and MOR, and only for the Douglas fir wood, wherein higher values were obtained for forest land. In terms assessed Douglas fir properties, it exceeds the domestic softwoods and represents a possible suitable replacement for them. The site only plays a role in terms of the Douglas fir, and only for certain properties.

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Production of Douglas-Fir in the Czech Republic based on national forest inventory data

Cited by 36 publications

References 9 publications

Comparison of Stiffness and Strength Properties of Untreated and Heat-Treated Wood of Douglas Fir and Alder

Comparison of Stiffness and Strength Properties of Untreated and Heat-Treated Wood of Douglas Fir and Alder

Climate Response of Douglas Fir Reveals Recently Increased Sensitivity to Drought Stress in Central Europe

Comparison of Wood Quality of Douglas Fir and Spruce from Afforested Agricultural Land and Permanent Forest Land in the Czech Republic

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