Nicolas Delpierre
A5022557344- Plant Water Relations and Carbon Dynamics
- Forest ecology and management
- Tree-ring climate responses
- Remote Sensing in Agriculture
- Species Distribution and Climate Change
- Horticultural and Viticultural Research
- Ecology and Vegetation Dynamics Studies
- Atmospheric and Environmental Gas Dynamics
- Plant and animal studies
- Climate variability and models
- Remote Sensing and LiDAR Applications
- Soil Carbon and Nitrogen Dynamics
- Hydrology and Watershed Management Studies
- Forest Management and Policy
- Leaf Properties and Growth Measurement
- French Urban and Social Studies
- Land Use and Ecosystem Services
- Plant responses to elevated CO2
- Fire effects on ecosystems
- Botany and Plant Ecology Studies
- Geophysics and Gravity Measurements
- Plant Ecology and Soil Science
- Soil Geostatistics and Mapping
- Animal Ecology and Behavior Studies
- African Botany and Ecology Studies
Université Paris-Saclay
2016-2025
Écologie, Systématique et Évolution
2015-2024
AgroParisTech
2015-2024
Centre National de la Recherche Scientifique
2015-2024
Institut Universitaire de France
2020-2024
Université Paris-Sud
2012-2024
Laboratoire des Sciences du Climat et de l'Environnement
2024
Centre for Research on Ecology and Forestry Applications
2023
Universitat Autònoma de Barcelona
2023
Consejo Superior de Investigaciones Científicas
2023
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...
Abstract Key message We demonstrate that, beyond leaf phenology, the phenological cycles of wood and fine roots present clear responses to environmental drivers in temperate boreal trees. These should be included terrestrial ecosystem models. Context In trees, a dormancy period prevents organ development during adverse climatic conditions. Whereas phenology leaves flowers has received considerable attention, date, little is known regarding other tree organs such as wood, roots, fruits,...
We apply and compare three widely applicable methods for estimating ecosystem transpiration (T) from eddy covariance (EC) data across 251 FLUXNET sites globally. All are based on the coupled water carbon relationship, but they differ in assumptions parameterizations. Intercomparison of daily T estimates shows high correlation among (R between .89 .94), a spread magnitudes T/ET (evapotranspiration) 45% to 77%. When compared at six with concurrent EC sap flow measurements, all EC-based show...
Uncertainties surrounding tree carbon allocation to growth are a major limitation projections of forest sequestration and response climate change. The prevalence extent which assimilation (source) or cambial activity (sink) mediate wood production fundamentally important remain elusive. We quantified source-sink relations across biomes by combining eddy-covariance gross primary with extensive on-site regional ring observations. found widespread temporal decoupling between growth, underpinned...
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. Plant transpiration links physiological responses of vegetation to water supply and demand with hydrological, energy, carbon budgets at the land–atmosphere interface. However, despite being main land evaporative flux global scale, its response environmental drivers are currently not well constrained by observations. Here we introduce first compilation whole-plant data from sap flow measurements (SAPFLUXNET, https://sapfluxnet.creaf.cat/, last access: 8 June 2021). We harmonized...
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...
Abstract Climate warming is substantially shifting the leaf phenological events of plants, and thereby impacting on their individual fitness also structure functioning ecosystems. Previous studies have largely focused climate impact spring phenology, to date processes underlying senescence associated environmental drivers remain poorly understood. In this study, experiments with temperature gradients imposed during summer autumn were conducted saplings European beech explore responses...
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...
Climate change affects the phenology of many species. As temperature and precipitation are thought to control autumn color in temperate deciduous trees, it is possible that climate might also affect colors. Using long-term data for eight tree species a New England hardwood forest, we show timing cumulative amount correlated with variation at specific times year. A phenological model driven by accumulated cold degree-days photoperiod reproduces most interspecific interannual variability We...
Abstract Plant transpiration ( T ), biologically controlled movement of water from soil to atmosphere, currently lacks sufficient estimates in space and time characterize global ecohydrology. Here we describe the Transpiration Estimation Algorithm (TEA), which uses both signals gross primary productivity evapotranspiration (ET) estimate temporal patterns use efficiency (WUE, i.e., ratio between ) is calculated. The method first isolates periods when most likely dominate ET. Then, a Random...
Abstract The phenology of wood formation is a critical process to consider for predicting how trees from the temperate and boreal zones may react climate change. Compared leaf phenology, however, determinism still poorly known. Here, we compared first time three alternative ecophysiological model classes ( threshold models, heat‐sum models chilling‐influenced models) an empirical in their ability predict starting date xylem cell enlargement spring, four major Northern Hemisphere conifers...
A Correction to this paper has been published: https://doi.org/10.1038/s41597-021-00851-9.
Abstract The relationships that control seed production in trees are fundamental to understanding the evolution of forest species and their capacity recover from increasing losses drought, fire, harvest. A synthesis fecundity data 714 worldwide allowed us examine hypotheses central quantifying reproduction, a foundation for assessing fitness trees. Four major findings emerged. First, is not constrained by strict trade-off between size numbers. Instead, numbers vary over ten orders magnitude,...
Abstract Temperate and boreal forests undergo drastic functional changes in the springtime, shifting within a few weeks from net carbon (C) sources to C sinks. Most of these are mediated by temperature. The autumn 2006–winter 2007 record warm period was followed an exceptionally spring Europe, making good candidate for advances onset photosynthetically active period. An analysis decade eddy covariance data six European stands, which encompass wide range types (broadleaf evergreen, broadleaf...