Félix de Tombeur

Félix de Tombeur
University of Western Australia | UWA · School of Biological Sciences

Postdoc
Postdoc researcher at UWA (Perth, Australia) and CEFE-CNRS (Montpellier, France)

About

29
Publications
11,706
Reads
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239
Citations
Introduction
Soil scientist fascinated by soil-plant interactions and plant ecophysiology
Additional affiliations
March 2022 - September 2024
French National Centre for Scientific Research
Position
  • PostDoc Position
October 2021 - February 2022
Université de Montpellier
Position
  • PostDoc Position
October 2016 - September 2021
University of Liège
Position
  • Research Assistant/PhD student
Education
October 2016 - June 2021
University of Liège
Field of study
  • Ecosystem ecology; soil science
September 2015 - June 2016
AgroParisTech
Field of study
  • Soil science

Publications

Publications (29)
Article
Full-text available
Terrestrial biogeochemistry of silicon Silicon is an important element in plant tissues and contributes to structural defenses against herbivores and other stresses. However, the terrestrial biogeochemical cycling of silicon is poorly understood, particularly the relative importance of geochemical and biological mechanisms in its regulation. de Tom...
Article
Full-text available
The resource availability hypothesis predicts that plants adapted to infertile soils have high levels of anti-herbivore leaf defenses. This hypothesis has been mostly explored for secondary metabolites such as phenolics, while it remains underexplored for silica-based defenses. We determined leaf concentrations of total phenols and silicon (Si) in...
Article
Full-text available
Background Silicon (Si) is increasingly recognized as a pivotal beneficial element for plants in ecology and agricultural sciences, but soil-plant Si cycling has been considered mostly through the prism of abiotic mineral weathering, whilst numerous biological processes have been overlooked. Leveraging ecological processes that impact soil-plant Si...
Article
Full-text available
Estimating plasticity of leaf silicon (Si) in response to abiotic and biotic factors underpins our comprehension of plant defences and stress resistance in natural and agroecosystems. However, how nitrogen (N) addition and intraspecific plant‐plant interactions affect Si concentration remains unclear. We grew 19 durum wheat genotypes (Triticum turg...
Article
Plants have evolved numerous strategies to acquire poorly available nutrients from soil, including the release of carboxylates from their roots. Silicon (Si) release from mineral dissolution increases in the presence of chelating substances , and recent evidence shows that leaf [Si] increases markedly in old phosphorus (P)-depleted soils, where man...
Article
Full-text available
Through their influence on microbial processes, carboxylates exuded by roots are key drivers of nutrient acquisition and organic carbon (C) storage in terrestrial ecosystems. However, the simultaneous interactions between environmental factors controlling the production and fates of carboxylates lead to uncertainty in understanding their role in te...
Article
Full-text available
Recent studies demonstrate a strong influence of soil age on long-term silicon (Si) dynamics in terrestrial ecosystems, but how variation in ecosystem water balance and soil parent material impact this trajectory is unknown. We addressed this by studying a 2-million-year dune chronosequence in southwestern Australia characterized by a positive wate...
Article
Full-text available
We introduce the AusTraits database - a compilation of values of plant traits for taxa in the Australian flora (hereafter AusTraits). AusTraits synthesises data on 448 traits across 28,640 taxa from field campaigns, published literature, taxonomic monographs, and individual taxon descriptions. Traits vary in scope from physiological measures of per...
Article
The amount of water available to leach solutes from soil is one of the major features determining mineral weathering, mineral neoformation and soil properties. It affects the fate of dissolved silicon (Si), which may follow four routes: leaching, mineral synthesis, adsorption, uptake by plants forming phytoliths. Here, we quantify the reservoirs of...
Thesis
Silicon (Si) is widely recognized as an important regulator of the global carbon (C) cycle via its effect on diatom productivity in oceans, and as a beneficial plant nutrient, improving resistance to herbivory and pathogens and mitigating the negative effects of several abiotic stresses. This thesis explores the long-term dynamics of Si in terrestr...
Conference Paper
Full-text available
Silicon (Si) is widely recognized as an important regulator of the global carbon (C) cycle via its effect on diatom productivity in oceans and the weathering of silicate minerals on continents. Si is also a beneficial plant nutrient, improving resistance to herbivory and pathogens and mitigating the negative effects of several abiotic stresses, inc...
Article
Full-text available
Aims Increasing the leaf silicification of cereal crops to ameliorate defenses against stresses and improve yields constitutes a major challenge in (sub-)tropical regions with highly desilicated soils. We tested the efficacy of different biochars – as readily available alternatives to commercial fertilizers – to increase leaf silicification and und...
Article
Full-text available
Silicon (Si) in plants confers a number of benefits, including resistance to herbivores and water or nutrient stress. However, the dynamics of Si during long-term ecosystem development remain poorly documented, especially the changes in soils in terms of plant availability. We studied a 2-million-year soil chronosequence to examine how long-term ch...
Article
Full-text available
AimsSilicon (Si) has beneficial effects in a variety of plant species and environments. Soil and climate affect silica accumulation in given plant species, but their roles on foliar silicification patterns and balance between silica and C-rich biopolymers as structural components is poorly known.Methods We studied silica deposition in situ in sugar...
Article
The ¹⁰Be, ¹³⁷Cs and ²¹⁰Pbxs radionuclide fallout has been used for the last several decades to quantify various soil and geomorphological processes on different time scales. However, a basic assumption of the studies relying on these radionuclides is that they have a strong affinity for soil particles and that their mobility in soil solution and lo...
Article
Leaf-litter is a significant source of biogenic Si, and differences among tree species in Si release rates during litter decomposition are important for quantifying Si cycles in forest ecosystems. We conducted two experiments to improve mechanistic understanding of Si release rates from dead leaves, using lowland tropical trees of Sarawak, Borneo....
Article
Studies of plant-silicon (Si) interaction benefit from safe, affordable and accurate methods to measure acid-insoluble silica (phytoliths) for a large number of plant samples. This study aimed to evaluate the comparability between two chemical methods to dissolve leaf silica, borate fusion and 1% sodium carbonate (Na2CO3) extraction, in combination...
Article
Phytoliths are fine silt-sized amorphous silica particles that form in living plant tissues. Once deposited in soils through plant debris, they may dissolve and increase the fluxes of silicon (Si) towards the biosphere and hydrosphere, thus enhancing positive Si impacts on e.g., plant health and carbon fixation by marine diatoms. Here we analyzed t...
Article
Full-text available
Environmental factors controlling silicon (Si) accumulation in terrestrial plant are key drivers to alleviate plant biotic stresses, including insect herbivory. While there is a general agreement on the ability of Si-enriched plant to better resist insect feeding, recent studies suggest that Si also primes biochemical defense pathways in various pl...
Poster
Full-text available
Silicon (Si) in plants confers a number of ecophysiological benefits, including resistance to herbivory, diseases, water stress and nutrient imbalances. However, the processes controlling Si availability to plants remain poorly understood. In this regard, numerous studies assume that phytogenic amorphous silicates (phytoliths) replenish Si in soil...
Conference Paper
Full-text available
Soil processes partly govern the terrestrial cycle of silicon (Si). The biological and physiological functions related to Si deposits in plants are increasingly studied. The understanding of tradeoffs between silicon and cellulose in leaf structure remains unclear and available studies are restricted to rice plants, mainly under controlled conditio...
Article
Full-text available
The limitations of conventional agriculture have accelerated the need for a transition to an environmentally and economically sustainable agricultural model. In this regard, the role played by soil organic matter (SOM) is key. Here, we aimed to study the impact of permaculture and biointensive micro-gardening practices, characterized by intensive c...
Research
Full-text available
Etude géologique, pédologique et floristique des coteaux de Seyssuel, Vienne et Chasse-sur-Rhône dans le cadre d'un stage de Master 1
Poster
Full-text available
Vertical matter transfer processes in soils and their dynamics are up to now poorly constrained although they are responsible for the temporal evolution of the ecosystem services of the soils through the redistribution of most of their components with depth, especially the finest ones responsible for the main properties of soil surface layers. In o...
Research
Full-text available
Les processus de transferts de matières verticaux dans les sols (bioturbation et lessivage) sont jusqu’à présent mal contraints. Afin de mieux contraindre ces processus, une méthode de quantification cinétique basée sur les profils verticaux de 210Pb (xs), 10Be et 137Cs a été développée pour les Luvisols, dans lesquels les transferts solubles peuve...

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Projects

Projects (3)
Project
This project aims to evaluate the effect of silicon on multitrophic interactions between plants- phytophagous insects and natural enemies by mediating herbivore-induced plant volatiles emission.
Project
Silicon (Si) is widely recognized as an important regulator of the global carbon (C) cycle via its effect on diatom productivity in oceans and the weathering of silicate minerals on continents. Si is also a beneficial plant nutrient, improving resistance to herbivory and pathogens and mitigating the negative effects of several abiotic stresses, including nutrient limitation. However, changes in Si sources and cycling during long-term development of terrestrial ecosystems remain poorly understood. In this project, we aim to study Si in soils and plants along three 2-Ma coastal dune chronosequences in southwestern Australia to understand the long-term dynamics of Si in terrestrial ecosystems from both a geochemical and ecological perspective.