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DOI : 10.60527/fjpt-5p77
Citer cette ressource :
AU. (2020, 27 janvier). [COLLOQUE] GENTREE Final Conference 27-31 January 2020 séance 12 , in GENTREE Scientific Conference - Genetics to the rescue : managing forests sustainably in a changing world. [Vidéo]. Canal-U. https://doi.org/10.60527/fjpt-5p77. (Consultée le 18 septembre 2024)
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[COLLOQUE] GENTREE Final Conference 27-31 January 2020 séance 12

Réalisation : 27 janvier 2020 - Mise en ligne : 27 janvier 2020
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GENTREE Final Conference :

Alexandre CHANGENET - INRAE Bordeaux · France

 

GENTREE Final Conference 'Genetics to the rescue - managing forests sustainably in a changing environment'

27-31 January 2020, Avignon, France

http://www.gentree-h2020.eu/

Alexandre CHANGENET - INRAE Bordeaux · France : Increaseddrought-induced tree mortality occurrence in the rear edge butmortality abundance did not show clear patterns on European treespecies

Tree mortality is increasing worldwide, which can alter foreststructure and dynamics and hence alter functioning and biodiversity.

Yet, the multi-factorial nature and stochasticity of tree mortalitychallenge its understanding at global scales.

Die-back mortality canbe triggered by extreme events such as droughts or insect outbreaks,whereas background or regular mortality can be attributed tonon-extreme abiotic and biotic factors.

However, patterns ofmortality at the species distribution scale and changes in theirunderlying drivers remain unclear.

Here, we analysed tree mortalityoccurrence and abundance of 19 major forest species from almost 2million of trees recorded from National Forest Inventories of Spain,France, Germany, Belgium, Sweden and Finland to understand the mainpatterns and drivers of tree mortality.

To this aim, we develophurdle models of mortality to separate the amount of mortality andthe occurrence of mortality.

Our objectives were to i) assess themain drivers of the amount and occurrence of tree mortality and ii)evaluate tree mortality patterns across species distribution ranges.

Our results show that patterns of European mortality patterns varybetween mortality occurrence and amount, which could be due todifferent underlying drivers from background to die-back mortalityevents.

Furthermore, mortality occurrence was mostly related todrought whereas the amount of mortality depended on many otherdrivers in addition to drought.

The highest mortality occurrence wasmostly found in the trailing edge of the species ranges whereasmortality abundance was patchily distributed across species ranges.

 

 

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