Terrestrial laser scanning reveals differences in crown structure of Fagus sylvatica in mixed vs. pure European forests

Barbeito, Ignacio; Dassot, Mathieu; Bayer, Dominik; Collet, Catherine; Drößler, Lars; Löf, Magnus; Rı́o, Miren del; Ruíz-Peinado, Ricardo; Forrester, David I.; Bravo‐Oviedo, Andrés; Pretzsch, Hans

doi:10.1016/j.foreco.2017.09.043

Cited by 98 publications

(72 citation statements)

References 53 publications

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“…The development of asymmetric crowns may be caused by branch expansion towards high light conditions (phototrophic growth) and by inhibition of branch growth and survival under unfavourable light conditions (correlative inhibition; Stoll & Schmid ). These results support the assumption that both vertical and lateral expansion of the crowns contribute significantly to physical niche partitioning in canopy space (Longuetaud et al ; Forrester & Bauhus ; Martin‐Ducup et al ; Barbeito et al ).…”

Section: Discussionsupporting

confidence: 88%

Neighbour species richness and local structural variability modulate aboveground allocation patterns and crown morphology of individual trees

et al. 2019

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Local neighbourhood interactions are considered a main driver for biodiversity–productivity relationships in forests. Yet, the structural responses of individual trees in species mixtures and their relation to crown complementarity remain poorly understood. Using a large‐scale forest experiment, we studied the impact of local tree species richness and structural variability on above‐ground wood volume allocation patterns and crown morphology. We applied terrestrial laser scanning to capture the three‐dimensional structure of trees and their temporal dynamics. We found that crown complementarity and crown plasticity increased with species richness. Trees growing in species‐rich neighbourhoods showed enhanced aboveground wood volume both in trunks and branches. Over time, neighbourhood diversity induced shifts in wood volume allocation in favour of branches, in particular for morphologically flexible species. Our results demonstrate that diversity‐mediated shifts in allocation pattern and crown morphology are a fundamental mechanism for crown complementarity and may be an important driver of overyielding.

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Section: Discussionsupporting

confidence: 88%

Neighbour species richness and local structural variability modulate aboveground allocation patterns and crown morphology of individual trees

et al. 2019

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“…As predicted by the balanced‐growth hypothesis, improved belowground resource availability, uptake, and use efficiency are reflected by increased investment in aboveground biomass (Shipley & Meziane, ; Poorter et al ., ). Depending on the species, this may result in higher plasticity of crown properties such as crown length, width, and crown surface due to more lateral branches and altered branch angles (Dieler & Pretzsch, ; Metz et al ., ; Jucker et al ., ; Olivier et al ., ; Barbeito et al ., ; Forrester et al ., ; Juchheim et al ., ). Higher plasticity together with possibly different vertical profiles of the mixed species ultimately result in higher canopy packing (Pretzsch, ; Jucker et al ., ; Riofrío et al ., ; Schmid & Niklaus, ; Williams et al ., ).…”

Section: Drivers Of the Diversity–productivity Relationshipmentioning

confidence: 99%

Diversity and forest productivity in a changing climate

2018

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Contents Summary 50 I. Introduction 50 II. Drivers of the diversity-productivity relationship 51 III. Patterns of the diversity-productivity relationship 55 IV. Responses of mixed stands to climate change 57 V. Conclusions 60 Acknowledgements 61 References 61 SUMMARY: Although the relationship between species diversity and biomass productivity has been extensively studied in grasslands, the impact of tree species diversity on forest productivity, as well as the main drivers of this relationship, are still under discussion. It is widely accepted that the magnitude of the relationship between tree diversity and forest stand productivity is context specific and depends on environmental conditions, but the underlying mechanisms of this relationship are still not fully understood. Competition reduction and facilitation have been identified as key mechanisms driving the diversity-productivity relationship. However, contrasting results have been reported with respect to the extent to which competition reduction and facilitation determine the diversity-productivity relationship. They appear to depend on regional climate, soil fertility, functional diversity of the tree species involved, and developmental stage of the forest. The purpose of this review is to summarize current knowledge and to suggest a conceptual framework to explain the various processes leading to higher productivity of species-rich forests compared with average yields of their respective monocultures. This framework provides three pathways for possible development of the diversity-productivity relationship under a changing climate.

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“…Barbeito et al, 2017;Del Río et al, 2017;González de Andrés et al, 2017;González de Andrés et al, 2018;Metz et al, 2016;Pretzsch et al, 2015), little is known about its litterfall dynamics and nutrient cycling. Barbeito et al, 2017;Del Río et al, 2017;González de Andrés et al, 2017;González de Andrés et al, 2018;Metz et al, 2016;Pretzsch et al, 2015), little is known about its litterfall dynamics and nutrient cycling.…”

Section: Introductionmentioning

confidence: 99%

ENSO and NAO affect long‐term leaf litter dynamics and stoichiometry of Scots pine and European beech mixedwoods

Andrés

Blanco

Imbert

et al. 2019

Global Change Biology

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Litterfall dynamics (production, seasonality and nutrient composition) are key factors influencing nutrient cycling. Leaf litter characteristics are modified by species composition, site conditions and water availability. However, significant evidence on how large‐scale, global circulation patterns affect ecophysiological processes at tree and ecosystem level remains scarce due to the difficulty in separating the combined influence of different factors on local climate and tree phenology. To fill this gap, we studied links between leaf litter dynamics with climate and other forest processes, such as tree‐ring width (TRW) and intrinsic water‐use efficiency (iWUE) in two mixtures of Scots pine (Pinus sylvestris L.) and European beech (Fagus sylvatica L.) in the south‐western Pyrenees. Temporal series (18 years) of litterfall production and elemental chemical composition were decomposed following the ensemble empirical mode decomposition method and relationships with local climate, large‐scale climatic indices, TRW and Scots pine's iWUE were assessed. Temporal trends in N:P ratios indicated increasing P limitation of soil microbes, thus affecting nutrient availability, as the ecological succession from a pine‐dominated to a beech‐dominated forest took place. A significant influence of large‐scale patterns on tree‐level ecophysiology was explained through the impact of the North Atlantic Oscillation (NAO) and El Niño–Southern Oscillation (ENSO) on water availability. Positive NAO and negative ENSO were related to dry conditions and, consequently, to early needle shedding and increased N:P ratio of both species. Autumn storm activity appears to be related to premature leaf abscission of European beech. Significant cascading effects from large‐scale patterns on local weather influenced pine TRW and iWUE. These variables also responded to leaf stoichiometry fallen 3 years prior to tree‐ring formation. Our results provide evidence of the cascading effect that variability in global climate circulation patterns can have on ecophysiological processes and stand dynamics in mixed forests.

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Terrestrial laser scanning reveals differences in crown structure of Fagus sylvatica in mixed vs. pure European forests

Cited by 98 publications

References 53 publications

Neighbour species richness and local structural variability modulate aboveground allocation patterns and crown morphology of individual trees

Neighbour species richness and local structural variability modulate aboveground allocation patterns and crown morphology of individual trees

Diversity and forest productivity in a changing climate

ENSO and NAO affect long‐term leaf litter dynamics and stoichiometry of Scots pine and European beech mixedwoods

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