Neighbourhood‐mediated shifts in tree biomass allocation drive overyielding in tropical species mixtures

Guillemot, Joannès; Kunz, Matthias; Schnabel, Florian; Fichtner, Andreas; Madsen, Christopher; Gebauer, Tobias; Härdtle, Werner; Oheimb, Goddert von; Potvin, Catherine

doi:10.1111/nph.16722

Cited by 46 publications

(68 citation statements)

References 75 publications

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“…Finally, trees in species-diverse forests may reduce drought and heat stress by reducing forest floor temperature. The structural diversity of trees in more diverse forests enhances canopy closure, thereby mitigating temperature effects on organisms on the forest floor (Guillemot et al, 2020). Considering the current biodiversity crisis fuelled by anthropogenic changes in land use and CO 2 levels (Trumbore et al, 2015), it is important to understand the underlying mechanisms driving diversity in forests.…”

Section: Introductionmentioning

confidence: 99%

Plot diversity differentially affects the chemical composition of leaves, roots and root exudates in four subtropical tree species

Weinhold

Döll

Liu

et al. 2020

Preprint

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Plants produce thousands of compounds, collectively called the metabolome, which mediate interactions with other organisms. The metabolome of an individual plant may change according to the number and nature of these interactions. We tested the hypothesis that tree diversity level affects the metabolome of four subtropical tree species in a biodiversity ecosystem-functioning experiment, BEF-China. We postulated that the chemical diversity of leaves, roots and root exudates increases with tree diversity. We expected the strength of this diversity effect to differ among leaf, root and root exudates samples. Considering their role in plant competition, we expected to find the strongest effects in root exudates.In an ecometabolomics approach, roots, root exudates and leaves of four tree species (Cinnamomum camphora, Cyclobalanopsis glauca, Daphniphyllum oldhamii, Schima superba) were sampled from selected plots in BEF-China. Samples were extracted and analysed using Liquid Chromatography-Time of Flight-Mass Spectrometry. The exudate metabolomes were normalized over their non-purgeable organic carbon level. Multivariate analyses were applied to identify the effect of both neighbouring (local) trees and plot diversity on tree metabolomes. The species and sample specific metabolites were assigned to major compound classes using the ClassyFire tool, whereas m/z features related to diversity effects were annotated manually.Individual tree species showed distinct leaf, root and root exudate metabolomes. The main compound class in leaves were the flavonoids, whereas carboxylic acids, prenol lipids and specific alkaloids were most prominent in root exudates and roots. Overall plot diversity had a stronger effect on metabolome profiles than the diversity of local, directly neighbouring trees. Leaf metabolomes responded more often to tree diversity level than exudates, whereas root metabolomes varied the least. We found not overall correlation between metabolite richness or diversity and tree diversity.Synthesis: Classification of metabolites supported initial ecological interpretation of differences among species and organs. Particularly the metabolomes of leaves and root exudates respond to differences in tree diversity. These responses were neither linear nor uniform and individual metabolites showed different dynamics. More controlled interaction experiments are needed to dissect the causes and consequences of the observed shifts in plant metabolomes.

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Section: Introductionmentioning

confidence: 99%

Plot diversity differentially affects the chemical composition of leaves, roots and root exudates in four subtropical tree species

Weinhold

Döll

Liu

et al. 2020

Preprint

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“…species combinations were not fully-factorial). Explicit consideration of functional traits in this Guillemot et al (2020;pp. 1256-1268, describing results of the 16-year-old Sardinilla tropical forest biodiversity experiment.…”

Section: How Do Species' Individual Functional Traits Control Structumentioning

confidence: 99%

“…Summary of main findings in the article in this issue of New Phytologist , Guillemot et al . (2020; pp. 1256–1268, describing results of the 16‐year‐old Sardinilla tropical forest biodiversity experiment.…”

Section: Figmentioning

confidence: 99%

“…In this issue of New Phytologist , Guillemot et al . (2020; pp. 1256–1268) use an unprecedented dataset from a long‐term tropical forest diversity experiment to explore the relationship between diversity and productivity in planted tropical forest stands.

‘… results indicate that plasticity in branch architecture allows trees in biodiverse stands to occupy space in the canopy more evenly and completely.’…”

Section: Figmentioning

confidence: 99%

“…The number and choice of species included in planted forests is one key decision in forest management. In this issue of New Phytologist, Guillemot et al (2020;pp. 1256-1268 use an unprecedented dataset from a long-term tropical forest diversity experiment to explore the relationship between diversity and productivity in planted tropical forest stands.…”

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confidence: 99%

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Plasticity in branching and crown architecture helps explain how tree diversity increases tropical forest production

Cushman

Machado²

2020

New Phytologist

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Positive tree diversity effects on arboreal spider abundance are tied to canopy cover in a forest experiment

Butz,

Schmitt,

Parker

et al. 2023

Ecology

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Human actions are decreasing the diversity and complexity of forests, and a mechanistic understanding of how these changes affect predators is needed to maintain ecosystem services, including pest regulation. Using a large-scale tree diversity experiment, we investigate how spiders respond to trees growing in plots of single or mixed species combinations (4 or 12) by repeatedly sampling 540 trees spanning 15 species. In 2019 (6 years post-establishment), spider responses to tree diversity varied by tree species. By 2021, diversity had a more consistently positive effect, with trees in 4-or 12-species plots supporting 23% or 50% more spiders, respectively, compared to conspecifics in monocultures. Spiders showed stronger tree species preferences in late summer, and the positive impact of plot diversity doubled. In early summer, the positive diversity effect was tied to higher canopy cover in diverse plots, leading to higher spider densities. This indirect path strengthened in late summer, with an additional direct effect of plot diversity on spiders. Prey availability was higher in diverse plots but was not tied to spider density. Overall, diverse plots supported more predators, partly by increasing available habitat. Adopting planting strategies focused on species mixtures may better maintain higher trophic levels and ecosystem functions.

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Neighbourhood‐mediated shifts in tree biomass allocation drive overyielding in tropical species mixtures

Cited by 46 publications

References 75 publications

Plot diversity differentially affects the chemical composition of leaves, roots and root exudates in four subtropical tree species

Plot diversity differentially affects the chemical composition of leaves, roots and root exudates in four subtropical tree species

Plasticity in branching and crown architecture helps explain how tree diversity increases tropical forest production

Positive tree diversity effects on arboreal spider abundance are tied to canopy cover in a forest experiment

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