Repeated droughts and fires mutually increase their impact on forest ecosystems - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement
Poster De Conférence Année : 2010

Repeated droughts and fires mutually increase their impact on forest ecosystems

Sécheresses et incendies répétés accroissent mutuellement leur impact sur l'écosystème

M. Vennetier
L. Cecillon
J.L. Boichard
  • Fonction : Auteur
T. Curt
Sonia Czarnes
Nathan Faivre
G. Favier
  • Fonction : Auteur
Raphaël Gros
B. Juvy
  • Fonction : Auteur
Xavier Le Roux
A. Masion
  • Fonction : Auteur
Vincent Pignot
  • Fonction : Auteur
F. Poly
  • Fonction : Auteur
Stéphane Ruy

Résumé

In a recent research project performed in South-Eastern France on the impact of repeated fires on many components of forest environment (vegetation, fauna, microbiology, soil physics, chemical properties, organic matter, nutrients) we showed a strong interaction between repeated droughts and repeated fires. Each disturbance significantly increases the impact of the other one. Repeated droughts can stop and even reverse the recovery process after fire, and delay this recovery when they occurred before fire. Repeated fires lessen the resistance and resilience of the ecosystem to drought. Forest regeneration processes are threatened even in usually fire-prone environments usually resilient. Soil biological activity is severely affected, and particularly some key groups as earthworms and bacteria contributing to nitrogen cycle. Soil physics and chemical properties appear to be degraded as a habitat, and indirectly the reduction of biological activity limits their recovery, including a negative carbon balance. Four successive years appear to be the critical threshold for drought and four times in 50 years the critical threshold for fires. As climate change may lead to higher drought frequency and fire occurrence is tied to drought, the drought/fire interaction may degrade forest ecosystems more rapidly than expected from separate assessment of drought and fire impacts.
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Dates et versions

hal-02593447 , version 1 (15-05-2020)

Identifiants

Citer

M. Vennetier, L. Cecillon, René Guénon, A. Schaffhauser, A. Vergnoux, et al.. Repeated droughts and fires mutually increase their impact on forest ecosystems. XXIII IUFRO world congress, Aug 2010, Seoul, South Korea. pp.57-58, 2010. ⟨hal-02593447⟩
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