A5103174688- Plant Water Relations and Carbon Dynamics
- Geology and Paleoclimatology Research
- Soil Carbon and Nitrogen Dynamics
- Microplastics and Plastic Pollution
- Groundwater and Isotope Geochemistry
- Tree-ring climate responses
- Soil and Unsaturated Flow
- Plant responses to water stress
- Groundwater flow and contamination studies
- Hydrology and Watershed Management Studies
- Soil and Water Nutrient Dynamics
- Isotope Analysis in Ecology
- Atmospheric and Environmental Gas Dynamics
- Peatlands and Wetlands Ecology
- Plant responses to elevated CO2
- Irrigation Practices and Water Management
- Recycling and Waste Management Techniques
- biodegradable polymer synthesis and properties
- Lichen and fungal ecology
- Cryospheric studies and observations
- Ecology and Vegetation Dynamics Studies
- Botany and Plant Ecology Studies
- Sustainable Supply Chain Management
- Forest ecology and management
- Meteorological Phenomena and Simulations
Institut d'écologie et des sciences de l'environnement de Paris
2015-2024
Sorbonne Université
2011-2024
Université Paris-Est Créteil
2010-2024
Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement
2022-2024
Institut de Recherche pour le Développement
2010-2024
Centre National de la Recherche Scientifique
2005-2022
AgroParisTech
2011-2020
Unité de Recherche Pluridisciplinaire Prairies et Plantes Fourragères
2019
Délégation Paris 7
2017
Stress Environnementaux et Biosurveillance des Milieux Aquatiques
2005-2010
Abstract We show that sapflow is a useful tool for studies of water fluxes in forest ecosystems, because (i) it gives access to the spatial variability within stand, (ii) can be used even on steep slopes, and (iii) when combined with eddy correlation measurements over forests, allows separation individual tree transpiration from total loss stand. Moreover, techniques are quite easy implement. Four currently coexist, all based heat diffusion xylem. found good agreement between three these...
Abstract In this study, we performed a partitioning of evapotranspiration (ET) under fully controlled conditions (climatic chamber) along growth tall fescue cover ( Festuca arundinacea ) into soil evaporation (Ev) and plant transpiration (Tr) by measuring their stable oxygen isotopic compositions (δ ET , δ Ev Tr ). We showed that it was possible, the chamber's particular conditions, to realize partition without (1) making hypothesis steady state usually done in field, nor (2) calculating as...
Recently available isotope ratio infrared spectroscopy can directly measure the isotopic composition of atmospheric water vapour (δ(18) O, δ(2) H), overcoming one main limitations mass spectrometry (IRMS) methods. Calibrating these gas-phase instruments requires vapourisation liquid standards since primary in principle are liquids. Here we test viability calibrating a wavelength-scanned cavity ring-down (CRDS) instrument with vapourised standards. We also quantify dependency measured values...
The effects of soil water depletion on sap flow, twig potential, stomatal and canopy conductance were analysed in 2 plots a 30-year-old stand Norway spruce.One was subjected to an imposed drought; the other watered by irrigation.Predawn potential trees from dry plot decreased -1.2 MPa.In plot, low between-tree variability flux density observed, with maximum values 1.2-1.9dm 3 •dm -2 •h -1 , corresponding about 0.5 mm•h .In showed higher variability, during summer mini- mum midday value 0.05...
Core Ideas An experimental setup was designed to observe and accurately locate hydraulic lift. Water stable isotope enrichment observed in topsoil layers. The results could be successfully reproduced using a 3D soil–root model. This study tested method quantify lift (HL, defined as the passive upward water flow from wetter dryer soil zones through plant root system) by combining an experiment 1 H 2 18 O tracer with soil–plant Our methodology consisted (i) establishing initial conditions for...
Stress effects induced on shoot photosynthesis and leaf water status by root hypoxia due to waterlogging have been assessed saplings of Quercus robur, Q petraea, rubra palustris in 2 successive experiments.Daily (first experiment) weekly (second measurements gas exchange were made during 7 wk with a ta- ble at 3 (1 st) 6 cm below the soil surface (2nd experiment).Net CO assimilation rate (A), conductance (g) rapidly strongly affected almost every case.CO diffusion analysis data revealed that...
— The tolerance of oak seedlings from 3 species (Quercus robur, Q rubra, palustris) to a 7-wk period waterlogging was tested under greenhouse conditions.The had comple- ted their height growth when treatments were applied.A permanent water table maintained at 6 cm below the soil surface.Shoot growth, root and mineral content xylem sap (P, K, Ca, Mg) leaf tissues (N, P, Mg, S, Mn) monitored weekly.Waterlogging strong consequences on development; flooded roots decayed, while...
Abstract. Isotopic labeling techniques have the potential to minimize uncertainty of plant root water uptake (RWU) profiles estimated using multisource (statistical) modeling by artificially enhancing soil isotopic gradient. On other end continuum, physical models can account for hydrodynamic constraints RWU if simultaneous and status data are available. In this study, a population tall fescue (Festuca arundinacea cv. Soni) was grown in amacro-rhizotron monitored 34 h long period following...
Concern exists about the suitability of laser spectroscopic instruments for measurement (18)O/(16)O and (2)H/(1)H values liquid samples other than pure water. It is possible to derive erroneous isotope due optical interference by certain organic compounds, including some commonly present in ecosystem-derived such as leaf or soil waters. Here we investigated reliability wavelength-scanned cavity ring-down spectroscopy (CRDS) measurements from a range waters, through comparison with ratio mass...
To maintain grassland productivity and limit resource depletion, scarce mineral P (phosphorus) fertilizers must be replaced by alternative sources. The effect of these amendments on plant growth may depend physicochemical soil parameters, in particular pH. objective this study was to investigate the pH biomass production, use efficiency, forms after amendment application (100 mg kg−1 P) using poultry manure compost (PM), rock phosphate (RP), their combination (PMRP). We performed a chamber...
Abstract The molecular composition of plant residues is suspected to largely govern the fate their constitutive carbon (C) in soils. Labile compounds, such as metabolic carbohydrates, are affected differently from recalcitrant and structural compounds by soil‐C stabilisation mechanisms. Producing 13 C‐enriched with specifically labeled fractions would help us investigate soils C these compounds. objective present research was test pulse chase labeling a method for enriching carbohydrate...
RATIONALE Plant tissues artificially labeled with 13 C are increasingly used in environmental studies to unravel biogeochemical and ecophysiological processes. However, the variability of C‐content has never been carefully investigated. Hence, this study aimed at documenting leaves. METHODS European beech Italian ryegrass were subjected long‐term C‐labeling a controlled‐environment growth chamber. The leaves obtained after several months labeling was determined by isotope ratio mass...
— Le flux hydrique circulant dans les troncs d'un perchis d'épicéa des Vosges a été direc- tement mesuré par sondes de fluxmètre radial au cours d'une saison végétation.Parallèle- ment, sèves xylémiques branches et ont extraites sur échantillons prélevés à intervalle régulier, respectivement pression parties feuillées déplacement une colonne d'eau.Ces analysées ICP pour principaux éléments minéraux (Ca, K, P, Mg, Si, Mn).Les d'éléments calculés produit hydriques concentrations comparés...