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Climate influences on the maximum size-density relationship in Scots pine (Pinus sylvestris L.) and European beech (Fagus sylvatica L.) stands

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Issue date
2017
Author
Condés, Sonia
Vallet, Patrick
Bielak, Kamil
Bravo Oviedo, Andrés
Coll Mir, Lluís
Ducey, Mark J.
Pach, Maciej
Pretzsch, Hans
Sterba, Hubert
Vayreda, Jordi
del Río, Miren
Suggested citation
Condés, Sonia; Vallet, Patrick; Bielak, Kamil; Bravo Oviedo, Andrés; Coll Mir, Lluís; Ducey, Mark J.; ... del Río, Miren. (2017) . Climate influences on the maximum size-density relationship in Scots pine (Pinus sylvestris L.) and European beech (Fagus sylvatica L.) stands. Forest Ecology and Management, 2017, vol. 385, p. 295-307. https://doi.org/10.1016/j.foreco.2016.10.059.
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Abstract
The maximum size-density relationship (MSDR) reflects the boundary site occupancy and the self-thinning line for a given species, being a useful tool in forestry. Studies focusing on the MSDR often do not cover the whole distribution of the studied species, which results in different boundaries for a given species in different regions. A common MSDR is lacking for the increasingly demanded large-scale studies. However, this information is important where silvicultural responses must be prioritized among monospecific stands or where comparisons among maximum and relative stand densities between and within species are required. For the purposes of this study, we used data from 9911 sample plots located in Scots pine and European beech monospecific stands. Both of these species are of considerable importance and widely distributed throughout Europe. The data came from National or Regional Forest Inventories of five European countries (Austria, Germany, France, Spain and Poland) and therefore were distributed across a wide range of climatic conditions. The main aim of this study was to determine whether the MSDR of these species depends on environmental variables and to develop a MSDR model for each species that explain this variability along a climate gradient. The resulting models showed that both parameters of species boundary lines were climate-dependent, but that the pattern of variation differed between species. Hence, the higher the humidity, the steeper the MSDR (more negative exponent) and the higher the intercept for beech, while in the case of pine, the higher the humidity, the straighter the MSDR and the lower the intercept. According to these models, the stand density indices, for a reference diameter of 25 cm, varied with the humidity in a different way for each species. Consequently, the ratio between the two species increases with humidity, although it also depends on stand diameter. These results are in accordance with the yield level theory and could contribute to the development of more precise silvicultural guidelines and growth models based on the self-thinning line. Moreover, they are of particular importance in the discussion of growth and the effects of mixing on mixed species stands.
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http://hdl.handle.net/10459.1/59113
DOI
https://doi.org/10.1016/j.foreco.2016.10.059
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Forest Ecology and Management, 2017, vol. 385, p. 295-307
European research projects
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  • Publicacions de projectes de recerca del Plan Nacional [2684]

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