Water uptake patterns in a tropical rainforest ecosystem and consequences on intra- and inter-annual variations in C flux and balance - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Accéder directement au contenu
Communication Dans Un Congrès Année : 2018

Water uptake patterns in a tropical rainforest ecosystem and consequences on intra- and inter-annual variations in C flux and balance

Damien Bonal
Bruno Hérault
Hans Verbeeck
Hannes de Deurwaerder
  • Fonction : Auteur
  • PersonId : 982664
Sabrina Coste
Clement Stahl

Résumé

Background/Question/Methods Tropical rainforest ecosystems are characterized by high annual rainfall. Nevertheless, rainfall regularly fluctuates during the year and seasonal soil droughts do occur. Over the past decades, a number of extreme droughts have hit tropical rainforests, not only in Amazonia but also in Asia and Africa. A great diversity and complexity of the response of tropical rainforest trees to drought has been found. We focus in this presentation on water uptake patterns in tropical rainforests and intra- and inter-annual variations in C flux and balance. Based on several studies conducted in a tropical rainforest ecosystem in French Guiana, we discuss the variability in depth of soil water uptake among trees and lianas during dry periods and the abiotic drivers (water limitation, radiation) of long-term variations in gross primary productivity (GPP), ecosystem respiration (RE) and net ecosystem exchange (NEE). Results/Conclusions A large variability in depth of water uptake among trees and lianas was found during dry seasons, which points to various ecological strategies in resistance and avoidance to drought. Global radiation was always the best predictor of annual and seasonal variations in GPP, RE and NEE, but soil water content did also influence carbon fluxes and balance. We conclude that the reduced precipitation expected in tropical rainforest areas under future climatic conditions will strongly influence carbon fluxes and carbon uptake. These results are essential to simulate the future of these ecosystems under diverse climate scenarios and to predict the future of the global earth carbon balance.
Fichier principal
Vignette du fichier
2018_BONAL_ ESA_1.pptx (3.01 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-02787187 , version 1 (05-06-2020)

Identifiants

  • HAL Id : hal-02787187 , version 1
  • PRODINRA : 442130

Citer

Damien Bonal, Maricar Aguilos, Benoît Burban, Bruno Hérault, Hans Verbeeck, et al.. Water uptake patterns in a tropical rainforest ecosystem and consequences on intra- and inter-annual variations in C flux and balance. ESA 2018 annual meeting, Ecological Society of America (ESA). USA., Aug 2018, New Orleans, United States. ⟨hal-02787187⟩
58 Consultations
35 Téléchargements

Partager

Gmail Facebook X LinkedIn More