Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Environmental control of land-atmosphere CO 2 fluxes from temperate ecosystems: a statistical approach based on homogenized time series from five land-use types

Abstract : (2020) Environmental control of land-atmosphere CO 2 fluxes from temperate ecosystems: a statistical approach based on homogenized time series from five land-use types, ABSTRACT We assembled homogenized long-term time series, up to 19 years, of measurements of net ecosystem exchange of CO 2 (NEE) and its partitioning between gross primary production (GPP) and respiration (R eco) for five different ecosystems representing the main plant functional types (PFTs) in France. Part of these data was analyzed to determine the influence of the main environmental variables on carbon fluxes between temperate ecosystems and the atmosphere, and to investigate the temporal patterns of their variations. A multi-temporal statistical analysis of the time series was conducted using random forest (RF) and wavelet coherence approaches. The RF analysis showed that, in all ecosystems, the incident solar radiation was highly correlated with GPP and that GPP was better correlated with the temporal variations of NEE than R eco. The air temperature was the second most important driver in ecosystems with seasonal foliage, i.e., deciduous forest, cropland and grassland; whereas variables related to air or soil drought were prominent in evergreen forest sites. The environmental control on CO 2 fluxes was tighter at high frequency suggesting an increased resilience to environmental variations at longer time spans. The spectral analysis performed on three of the five sites selected revealed contrasting temporal patterns of the cross-coherence between CO 2 fluxes and climate variables among ecosystems; these were related to the respective PFT, management and soil conditions. In all PFTs, the power spectrum of GPP was well correlated with NEE and clearly different from R eco. The spectral correlation analysis showed that the canopy phenology and disturbance regime condition the spectral correlation patterns of GPP and R eco with the soil moisture and atmospheric vapour deficit.
Type de document :
Article dans une revue
Liste complète des métadonnées

Littérature citée [103 références]  Voir  Masquer  Télécharger

https://hal.inrae.fr/hal-02900349
Déposant : Michèle Rocher <>
Soumis le : jeudi 16 juillet 2020 - 09:04:00
Dernière modification le : lundi 21 septembre 2020 - 17:10:07

Fichier

2020_moreaux_tellus.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Licence


Distributed under a Creative Commons Paternité - Pas d'utilisation commerciale 4.0 International License

Identifiants

Citation

Virginie Moreaux, Bernard Longdoz, Daniel Berveiller, Nicolas Delpierre, Eric Dufrêne, et al.. Environmental control of land-atmosphere CO 2 fluxes from temperate ecosystems: a statistical approach based on homogenized time series from five land-use types. Tellus B - Chemical and Physical Meteorology, Taylor & Francis, 2020, 72 (1), pp.1-25. ⟨10.1080/16000889.2020.1784689⟩. ⟨hal-02900349⟩

Partager

Métriques

Consultations de la notice

85

Téléchargements de fichiers

76