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With increasing site quality asymmetric competition and mortality reduces Scots pine (Pinus sylvestris L.) stand structuring across Europe

Pretzsch, Hans and Bravo-Oviedo, Andres and Hilmers, Torben and Ruiz-Peinado, Ricardo and Coll, Lluis and Löf, Magnus and Ahmed, Shamim and Aldea, Jorge and Ammer, Christian and Barbeito, Ignacio and Bielak, Kamil and Bravo, Felipe and Brazaitis, Gediminas and Cerny, Jakub and Collet, Catherine and Drossler, Lars and Fabrika, Marek and Heym, Michael and Holm, Stig-Olof and Hylen, Gro and Jansons, Aris and Kurylyak, Viktor and Lombardi, Fabio and Matovic, Bratislav and Metslaid, Marek and Motta, Renzo and Nord-Larsen, Thomas and Nothdurft, Arne and Ordonez, Cristobal and den Ouden, Jan and Pach, Maciej and Ponette, Quentin and Perot, Tomas and Reventlow, Ditlev Otto Juel and Sitko, Roman and Sramek, Vit and Steckel, Mathias and Svoboda, Miroslav and Uhl, Enno and Verheyen, Kris and Vospernik, Sonja and Wolff, Barbara and Zlatanov, Tzvetan and del Rio, Miren (2022). With increasing site quality asymmetric competition and mortality reduces Scots pine (Pinus sylvestris L.) stand structuring across Europe. Forest Ecology and Management. 520 , 120365
[Research article]

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Abstract

Heterogeneity of structure can increase mechanical stability, stress resistance and resilience, biodiversity and many other functions and services of forest stands. That is why many silvicultural measures aim at enhancing structural diversity. However, the effectiveness and potential of structuring may depend on the site conditions. Here, we revealed how the stand structure is determined by site quality and results from site-dependent partitioning of growth and mortality among the trees. We based our study on 90 mature, even-aged, fully stocked monocultures of Scots pine (Pines sylvestris L.) sampled in 21 countries along a productivity gradient across Europe. A mini-simulation study further analyzed the site-dependency of the interplay between growth and mortality and the resulting stand structure. The overarching hypothesis was that the stand structure changes with site quality and results from the site-dependent asymmetry of competition and mortality.First, we show that Scots pine stands structure across Europe become more homogeneous with increasing site quality. The coefficient of variation and Gini coefficient of stem diameter and tree height continuously decreased, whereas Stand Density Index and stand basal area increased with site index.Second, we reveal a site-dependency of the growth distribution among the trees and the mortality. With increasing site index, the asymmetry of both competition and growth distribution increased and suggested, at first glance, an increase in stand heterogeneity. However, with increasing site index, mortality eliminates mainly small instead of all-sized trees, cancels the size variation and reduces the structural heterogeneity.Third, we modelled the site-dependent interplay between growth partitioning and mortality. By scenario runs for different site conditions, we can show how the site-dependent structure at the stand level emerges from the asymmetric competition and mortality at the tree level and how the interplay changes with increasing site quality across Europe.Our most interesting finding was that the growth partitioning became more asymmetric and structuring with increasing site quality, but that the mortality eliminated predominantly small trees, reduced their size variation and thus reversed the impact of site quality on the structure. Finally, the reverse effects of mode of growth partitioning and mortality on the stand structure resulted in the highest size variation on poor sites and decreased structural heterogeneity with increasing site quality. Since our results indicate where heterogeneous structures need silviculture interventions and where they emerge naturally, we conclude that these findings may improve system understanding and modelling and guide forest management aiming at structurally rich forests.

Authors/Creators:Pretzsch, Hans and Bravo-Oviedo, Andres and Hilmers, Torben and Ruiz-Peinado, Ricardo and Coll, Lluis and Löf, Magnus and Ahmed, Shamim and Aldea, Jorge and Ammer, Christian and Barbeito, Ignacio and Bielak, Kamil and Bravo, Felipe and Brazaitis, Gediminas and Cerny, Jakub and Collet, Catherine and Drossler, Lars and Fabrika, Marek and Heym, Michael and Holm, Stig-Olof and Hylen, Gro and Jansons, Aris and Kurylyak, Viktor and Lombardi, Fabio and Matovic, Bratislav and Metslaid, Marek and Motta, Renzo and Nord-Larsen, Thomas and Nothdurft, Arne and Ordonez, Cristobal and den Ouden, Jan and Pach, Maciej and Ponette, Quentin and Perot, Tomas and Reventlow, Ditlev Otto Juel and Sitko, Roman and Sramek, Vit and Steckel, Mathias and Svoboda, Miroslav and Uhl, Enno and Verheyen, Kris and Vospernik, Sonja and Wolff, Barbara and Zlatanov, Tzvetan and del Rio, Miren
Title:With increasing site quality asymmetric competition and mortality reduces Scots pine (Pinus sylvestris L.) stand structuring across Europe
Series Name/Journal:Forest Ecology and Management
Year of publishing :2022
Volume:520
Article number:120365
Number of Pages:14
Publisher:ELSEVIER
ISSN:0378-1127
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:Asymmetry of competition, Size-dependent mortality, Mode of competition, Growth dominance coefficient, Gini coefficient, Structural heterogeneity
URN:NBN:urn:nbn:se:slu:epsilon-p-118696
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-118696
Additional ID:
Type of IDID
DOI10.1016/j.foreco.2022.120365
Web of Science (WoS)000832812800005
ID Code:28742
Faculty:S - Faculty of Forest Sciences
Department:(S) > Southern Swedish Forest Research Centre
Deposited By: SLUpub Connector
Deposited On:02 Sep 2022 08:28
Metadata Last Modified:02 Sep 2022 08:31

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