Éric Dufrêne
A5061141147- Plant Water Relations and Carbon Dynamics
- Forest ecology and management
- Remote Sensing in Agriculture
- Tree-ring climate responses
- Plant and animal studies
- Remote Sensing and LiDAR Applications
- Species Distribution and Climate Change
- Horticultural and Viticultural Research
- Plant responses to elevated CO2
- Leaf Properties and Growth Measurement
- Ecology and Vegetation Dynamics Studies
- Oil Palm Production and Sustainability
- Atmospheric and Environmental Gas Dynamics
- Forest Management and Policy
- Insect and Arachnid Ecology and Behavior
- Insect and Pesticide Research
- Soil Carbon and Nitrogen Dynamics
- Plant Parasitism and Resistance
- Urban Heat Island Mitigation
- Botany and Plant Ecology Studies
- Fire effects on ecosystems
- Forest Biomass Utilization and Management
- Climate variability and models
- Land Use and Ecosystem Services
- Peatlands and Wetlands Ecology
Aix-Marseille Université
2024
Écologie, Systématique et Évolution
2013-2022
Centre National de la Recherche Scientifique
2011-2022
Université Paris-Saclay
2009-2022
AgroParisTech
2011-2022
Université Paris-Sud
2009-2020
Observatoire de la Côte d’Azur
2008-2020
Ecologie et Ecophysiologie Forestières
2012
Université de Bourgogne
2010
Université Paris Cité
1997-2004
Abstract The FLUXNET2015 dataset provides ecosystem-scale data on CO 2 , water, and energy exchange between the biosphere atmosphere, other meteorological biological measurements, from 212 sites around globe (over 1500 site-years, up to including year 2014). These sites, independently managed operated, voluntarily contributed their create global datasets. Data were quality controlled processed using uniform methods, improve consistency intercomparability across sites. is already being used...
Monitoring cambial phenology and intra-annual growth dynamics is a useful approach for characterizing the tree response to climate change. However, there have been few reports concerning wood formation in lowland temperate forests with high time resolution, especially comparison between deciduous coniferous species. The main objective of this study was determine how timing, duration rate radial change species as related leaf non-structural carbohydrates (NSC) under same climatic conditions....
Abstract Heatwaves exert disproportionately strong and sometimes irreversible impacts on forest ecosystems. These remain poorly understood at the tree species level across large spatial scales. Here, we investigate effects of record-breaking 2018 European heatwave growth water status using a collection high-temporal resolution dendrometer data from 21 53 sites. Relative to two preceding years, annual stem was not consistently reduced by but stems experienced twice temporary shrinkage due...
Abstract 1. We present measurements of CO 2 fluxes over years above and within a young Beech stand in the east France. This site is part Euroflux network set up to monitor representative European forests. 2. The net ecosystem carbon (C) exchange was derived from continuous eddy flux measurements. Major components total (i.e. soil above‐ground biomass respiration assimilation leafy branches) were measured independently using chambers. main C stocks root, stem branch biomass) also quantified....
• The exhaustive distribution of total carbohydrate reserves was investigated in oak and beech trees that were approx. 40 yr old felled at two dates (October 1999 June 2000) to estimate variations reserve amounts the tree level. nonstructural (TNC) content highest twigs coarse roots, reaching 10 g 100 g−1 dry matter 12 for twigs, 13 16 respectively. Similar carbohydrates observed both species date, but with contrasting starch/sugar sharing. Scaling-up level performed extensive organ biomass...
Two types of physiological mechanisms can contribute to growth decline with age: (i) the leading reduction carbon assimilation (input) and (ii) those modification resource economy. Surprisingly, processes relating allocation have been little investigated as compared research on governing assimilation. The objective this paper was thus test hypothesis that decrease related age is accompanied by changes in benefit storage reproductive functions two contrasting broad-leaved species: beech...
Understanding the relationships between climate and carbon exchange by terrestrial ecosystems is critical to predict future levels of atmospheric dioxide because potential accelerating effects positive climate–carbon cycle feedbacks. However, directly observed CO2 with atmosphere across biomes continents are lacking. Here we present data describing net ecosystem (NEE) factors as measured using eddy covariance method at 125 unique sites in various over six a total 559 site-years. We find that...
Summary Although the analysis of flux data has increased our understanding interannual variability carbon inputs into forest ecosystems, we still know little about determinants wood growth. Here, aimed to identify which drivers control growth in a mesic temperate deciduous forest. We analysed 9‐yr time series fluxes and aboveground (AWG), reconstructed at weekly time‐scale through combination dendrometer density data. Carbon AWG anomalies appeared be uncorrelated from seasonal scales. More...
In this study, the potential of Sentinel-1 data to seasonally monitor temperate forests was investigated by analyzing radar signatures observed from plots in Fontainebleau Forest Ile de France region, France, for period extending March 2015 January 2016. Radar backscattering coefficients, σ0 and amplitude temporal interferometric coherence profiles relation environmental variables are shown, such as situ precipitation air temperature. The high frequency acquisitions (i.e., twelve days, or...
A Correction to this paper has been published: https://doi.org/10.1038/s41597-021-00851-9.
Annual time-series of the two satellites C-band SAR (Synthetic Aperture Radar) Sentinel-1A and 1B data over five years were used to characterize phenological cycle a temperate deciduous forest. Six metrics start (SOS), middle (MOS) end (EOS) budburst leaf expansion stage in spring, (SOF), (MOF) (EOF) senescence autumn extracted using an asymmetric double sigmoid function (ADS) fitted ratio (VV/VH) backscattering at co-polarization VV (vertical–vertical) cross polarization VH...
Abstract Pollinators play a crucial role in ecosystems globally, ensuring the seed production of most flowering plants. They are threatened by global changes and knowledge their distribution at national continental levels is needed to implement efficient conservation actions, but this still fragmented and/or difficult access. As step forward, we provide an updated list around 3000 European bee hoverfly species, reflecting current distributional status level (in form present, absent,...