Search results for: Stéphane Ponton

Items from 1 to 8 out of 8 results

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Cutting tree rings into time slices: how intra‐annual dynamics of wood formation help decipher the space‐for‐time conversion

Gonzalo Pérez‐de‐Lis, Cyrille B. K. Rathgeber, Laura Fernández‐de‐Uña, Stéphane Ponton

Tree‐ring anatomy, microdensity and isotope records provide valuable intra‐annual information. However, extracting signals at that scale is challenged by the complexity of xylogenesis, where two major processes – cell enlargement and wall thickening – occur at different times and rates. We characterized the space‐for‐time association in the tree rings of three conifer species by examining the...

article

Short- and Long-term Influence of Litter Quality and Quantity on Simulated Heterotrophic Soil Respiration in a Lowland Tropical Forest

Laëtitia Bréchet, Valérie Dantec, Stéphane Ponton, Jean-Yves Goret, more

Ecosystems > 2017 > 20 > 6 > 1190-1204

Heterotrophic soil respiration (SR_H) alone can contribute up to 50% of total ecosystem respiration in tropical forests. Whereas the abiotic controls of SR_H have been extensively studied, the influence of plant traits is less well characterised. We used field experiments and a modelling approach to test the relative influence of plant traits on SR_H in lowland tropical forest in French Guiana. We measured...

article

Evidence for strong seasonality in the carbon storage and carbon use efficiency of an Amazonian forest

Lucy Rowland, Timothy Charles Hill, Clement Stahl, Lukas Siebicke, more

Global Change Biology > 20 > 3 > 979 - 991

The relative contribution of gross primary production and ecosystem respiration to seasonal changes in the net carbon flux of tropical forests remains poorly quantified by both modelling and field studies. We use data assimilation to combine nine ecological time series from an eastern Amazonian forest, with mass balance constraints from an ecosystem carbon cycle model. The resulting analysis quantifies,...

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Leaf functional response to increasing atmospheric CO₂ concentrations over the last century in two northern Amazonian tree species: a historical δ¹³C and δ¹⁸O approach using herbarium samples

DAMIEN BONAL, STÉPHANE PONTON, DIDIER LE THIEC, BÉATRICE RICHARD, more

Plant, Cell & Environment > 34 > 8 > 1332 - 1344

We assessed the extent of recent environmental changes on leaf morphological (stomatal density, stomatal surface, leaf mass per unit area) and physiological traits (carbon isotope composition, δ¹³C_leaf, and discrimination, Δ¹³C_leaf, oxygen isotope composition, δ¹⁸O_leaf) of two tropical rainforest species (Dicorynia guianensis; Humiria balsamifera) that are abundant in the Guiana shield (Northern Amazonia)...

article

Does spatial distribution of tree size account for spatial variation in soil respiration in a tropical forest?

Laëtitia Bréchet, Stéphane Ponton, Tancrède Alméras, Damien Bonal, more

Plant and Soil > 2011 > 347 > 1-2 > 293-303

We explored the relationship between soil processes, estimated through soil respiration (R _soil), and the spatial variation in forest structure, assessed through the distribution of tree size, in order to understand the determinism of spatial variations in R _soil in a tropical forest. The influence of tree size was examined using an index (I _c) calculated for each tree as a function of (1) the...

article

Root exclusion through trenching does not affect the isotopic composition of soil CO₂ efflux

Nicolas Chemidlin Prévost-Bouré, Jérome Ngao, Daniel Berveiller, Damien Bonal, more

Plant and Soil > 2009 > 319 > 1-2 > 1-13

Disentangling the autotrophic and heterotrophic components of soil CO₂ efflux is critical to understanding the role of soil system in terrestrial carbon (C) cycling. In this study, we combined a stable C-isotope natural abundance approach with the trenched plot method to determine if root exclusion significantly affected the isotopic composition (δ¹³C) of soil CO₂ efflux (R_S). This study was performed...

article

Do tree species characteristics influence soil respiration in tropical forests? A test based on 16 tree species planted in monospecific plots

Laëtitia Bréchet, Stéphane Ponton, Jacques Roy, Vincent Freycon, more

Plant and Soil > 2009 > 319 > 1-2 > 235-246

The high spatial variability of soil respiration in tropical rainforests is well evaluated, but influences of biotic factors are not clearly understood. This study underlines the influence of tree species characteristics on soil respiration across a 16-monospecific plot design in a tropical plantation of French Guiana. A large variability of soil CO₂ fluxes was observed among plots (i.e. 2.8 to 6...

article

Differing nitrogen use strategies of two tropical rainforest late successional tree species in French Guiana: Evidence from 15N natural abundance and microbial activities

Heidy Schimann, Stéphane Ponton, Stephan Hättenschwiler, Bruno Ferry, more

Soil Biology and Biochemistry > 2008 > 40 > 2 > 487-494

Previous studies in lowland tropical rainforests of French Guiana showed that, among non-N ₂ -fixing trees, two groups of late successional species contrasting in their leaf ¹⁵ N natural abundance coexist, suggesting two different main ways of nitrogen acquisition. Two abundant late-successional species typically co-occurring in rainforests in French Guiana, namely Eperua falcata and...

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INFONA - science communication portal

Search results for: Stéphane Ponton

Cutting tree rings into time slices: how intra‐annual dynamics of wood formation help decipher the space‐for‐time conversion

Short- and Long-term Influence of Litter Quality and Quantity on Simulated Heterotrophic Soil Respiration in a Lowland Tropical Forest

Evidence for strong seasonality in the carbon storage and carbon use efficiency of an Amazonian forest

Leaf functional response to increasing atmospheric CO₂ concentrations over the last century in two northern Amazonian tree species: a historical δ¹³C and δ¹⁸O approach using herbarium samples

Does spatial distribution of tree size account for spatial variation in soil respiration in a tropical forest?

Root exclusion through trenching does not affect the isotopic composition of soil CO₂ efflux

Do tree species characteristics influence soil respiration in tropical forests? A test based on 16 tree species planted in monospecific plots

Differing nitrogen use strategies of two tropical rainforest late successional tree species in French Guiana: Evidence from 15N natural abundance and microbial activities

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