Waldbau mit Douglasie in Deutschland und in Frankreich

Kohnle, Ulrich; Klädtke, Joachim; Chopard, Bruno

doi:10.3188/szf.2021.0066

Cited by 3 publications

(6 citation statements)

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“…As shown in Figure 1, the larger the areas (square to strip) of planting, the higher the chance for Douglas-fir to survive competition from neighboring tree species. This corresponds to findings by [48,73]. The authors conclude that when planting Douglas-fir as an enrichment of naturally regenerated beech, Douglas-fir trees need to be planted in homogeneous patches to avoid competition among species.…”

Section: Discussionsupporting

confidence: 86%

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Evaluating Strategies for the Management of Douglas-Fir in Central Europe

Eberhard

Eckhart

Hasenauer

2021

Forests

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In view of the increasing demand for forest resources in Europe, it is an option to foster the use of non-native tree species that can keep pace with the rapidly changing environmental conditions, such as Douglas-fir (Pseudotsuga menziesii). Thus, sufficient knowledge of how to manage such introduced species is highly required. In this study, we investigate theoretical silvicultural management options of Douglas-fir for forests in central Europe. We follow a three-step approach: (i) we collect the current central European management practices based on 434 Douglas-fir stands managed by 19 forest companies in Eastern Austria and Southern Germany using a survey. (ii) We calibrate and validate a Douglas-fir parameter set for the tree growth simulator MOSES so that we are able to (iii) simulate the silvicultural management options of Douglas-fir management. Our simulation results suggest: in mixed stands, Douglas-fir should be planted in mono-species patches. This leads to about six times higher productivity compared to a random arrangement. Natural regeneration is possible but requires active management at further development since the productivity might decrease up to 86% when growing in association with the highly competitive native tree species, Common beech (Fagus sylvatica). Intensive tending, as well as thinning, yields a surplus stem volume production of more than 30% in comparison with a moderate intervention. Even if our simulation results were not validated in the field, this analysis suggests that modeling as a heuristic tool is a useful instrument for forest managers in the decision-making process.

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Section: Discussionsupporting

confidence: 86%

“…Similar findings have been reported by [44][45][46]. According to [47,48], the initial stem number is crucial for the tree's stability, stand productivity, and timber quality. For further Douglas-fir studies from Europe, we refer to [49].…”

Section: Introductionsupporting

confidence: 87%

Evaluating Strategies for the Management of Douglas-Fir in Central Europe

Eberhard

Eckhart

Hasenauer

2021

Forests

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“…The initial stand density used in Douglas-fir plantations will affect the long-term stabilityof the trees as well as stand productivity and timber quality (Klädtke et al 2012;Kohnle et al 2021;both in Eberhard et al 2021). A lower initial stand density improves tree stability and promotes social differentiation (several authors, in Eberhard et al.…”

Section: Plant Production Spacing and Early Establishmentmentioning

confidence: 99%

“…Therefore, pruning is widely regarded as essential to increase log quality when targeting the production of highly valuable wood products, e.g., France (Hubert and Courraud 1998), Germany (Kohnle et al 2019(Kohnle et al , 2021, the Czech Republic (Novák et al 2018;Mondek and Balaš 2019) and Switzerland (Schütz et al 2015). The selling price for well-pruned logs could easily be 80 euros more per m 3 than for unpruned logs (Schütz et al 2015).…”

Section: Thinning and Pruningmentioning

confidence: 99%

“…Long rotations in combination with large diameters are favorable management options to reduce the amount of juvenile wood and provide a more homogenous wood material (Henin et al 2019). Slower radial growth usually benefits technological wood properties (e.g., reduced proportion of juvenile wood, branch diameters) (Henin et al 2019), but long rotation are associated with higher risks, i.e., storm damage increases progressively with stand height (CRPF 2010; Kohnle et al 2021). When reaching rotation age, European stands of Douglas-fir have traditionally been harvested through clear-felling, followed by replanting on the site as in the Czech Republic (Podrázský pers.comm.…”

Section: Rotation Lengthmentioning

confidence: 99%

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Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) in Europe: an overview of management practices

et al. 2023

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Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), one of the most commercially important tree species in western North America and one of the most valuable timber trees worldwide, was introduced to Europe in 1827. It became a major species for afforestation in Western Europe after WWII, currently grows in 35 countries on over 0.83 million ha and is one of the most widespread non-native tree species across the continent. A lower sensitivity to drought makes Douglas-fir a potential alternative to the more drought-sensitive Norway spruce so its importance in Europe is expected to increase in the future. It is one of the fastest growing conifer species cultivated in Europe, with the largest reported dimensions of 2.3 m in diameter and 67.5 m in height. Pure stands have high productivity (up to 20 m3 ha-1a-1) and production (over 1000 m3 ha-1). The species is generally regenerated by planting (initial stocking density from less than 1000 seedlings ha-1 to more than 4000 ha-1), using seedlings of European provenance derived from seed orchards or certified seed stands. As the range of end-uses of its wood is very wide, the rotation period of Douglas-fir is highly variable and ranges between 40 and 120 years. When the production of large-sized, knot-free timber is targeted, thinnings are always coupled with pruning up to 6 m. There is an increasing interest in growing Douglas-fir in mixtures and managing stands through close-to-nature silviculture, but the species’ intermediate shade tolerance means that it is best managed through group selection or shelterwood systems.

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Interannual radial growth response of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) to severe droughts: an analysis along a gradient of soil properties and rooting characteristics

Spangenberg,

Zimmermann,

Küppers

et al. 2024

Annals of Forest Science

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Key message We analyzed stem growth responses of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) to severe drought in 2003/04 and 2018. The results showed high drought tolerance in sandy, loamy, and most silty soils, with limitations on clayey soils. This study indicates the susceptibility of Douglas-firs with shallow root systems to extreme drought and the importance of deep rooting for high drought resilience. Context Although Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) is considered a more drought-tolerant substitute for Norway spruce (Picea abies (L.) Karst.) in Europe, there is considerable uncertainty about the drought tolerance of Douglas-fir under climate change, specifically concerning soil properties. Aims This study aimed to assess the influence of soil texture, plant-available water capacity, and rooting characteristics on the interannual stem growth response of Douglas-fir when exposed to severe drought. Methods Along a soil texture gradient from sand to clay, we selected seven closely spaced sites at elevations of approximately 500 m a.s.l. in southern Germany. Mixed-effects models were used to analyze the effects of soil physical and rooting characteristics on growth response indices (resistance, recovery, resilience) related to the severe to extreme droughts in 2003/04 and 2018. Results Douglas-fir showed high drought tolerance in sandy, loamy, and most silty soils. However, the results suggest a higher drought stress risk on clayey soils, as well as at specific silty sites with shallow root systems. A higher effective rooting depth increased the resilience of Douglas-fir during the extreme drought in 2018. Conclusion Douglas-fir demonstrated its drought tolerance in most soil textures. In addition, this study supports the need for combined above- and below-ground investigations on factors influencing drought tolerance and the importance of rooting for drought resilience.

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Waldbau mit Douglasie in Deutschland und in Frankreich

Cited by 3 publications

References 0 publications

Evaluating Strategies for the Management of Douglas-Fir in Central Europe

Evaluating Strategies for the Management of Douglas-Fir in Central Europe

Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) in Europe: an overview of management practices

Interannual radial growth response of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) to severe droughts: an analysis along a gradient of soil properties and rooting characteristics

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