Dynamically simulating spruce budworm in eastern Canada and its interactions with wildfire

Sato Hiromitsu, Chaste Emeline, Girardin Martin P., Kaplan Jed O., Hély Christelle, Candau Jean-Noël, Mayor Stephen J.. 2023. Dynamically simulating spruce budworm in eastern Canada and its interactions with wildfire. Ecological Modelling, 483:110412, 13 p.

Url - jeu de données - Entrepôt autre : https://doi.org/10.5281/zenodo.6941561

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Economie-gestion

Résumé : Eastern Spruce Budworm (ESBW) is a major agent of disturbance in Eastern Canada's boreal forests. Outbreaks have historically led to widespread defoliation of its preferred host trees, fir and spruce species, leading to high rates of mortality. This in turn can result in significant economic losses and enhancement of fire potential in the region. Representation of such biotic disturbance has rarely been included in Dynamic Global Vegetation Models (DGVM), which have become essential tools in understanding and predicting forest dynamics in present and future contexts. We present novel representation of host-specific defoliation in a DGVM (LPJ-LMfire), to better represent disturbance regimes in the boreal forest of eastern Canada. Using host foliage density to trigger outbreak, we were able to calibrate and simulate general spatial patterns of defoliation relative to historical aerial sketch map data. Return intervals were thus sensitive to the growth rates of host trees. Modeled return intervals tended to be significantly longer than 30 years, the approximate observed return interval. A factorial experiment was performed on the interactions of ESBW with wildfire, which was found to be slightly enhanced in terms of burned areas after outbreaks due to increased fuel loads. Interactions between ESBW and fire were found to have higher interaction strength in the drier Western region of the boreal forest. Our study demonstrates that biotic disturbance and its interaction with wildfire can be effectively simulated in a DGVM. We show that bottom-up climatic controls are sufficient to drive simulated spatiotemporal patterns of ESBW that can be calibrated to generally match historical observations.

Mots-clés Agrovoc : incendie spontané, Choristoneura fumiferana, forêt, forêt boréale, incendie de forêt, Choristoneura

Mots-clés géographiques Agrovoc : Canada

Classification Agris : H10 - Ravageurs des plantes
H50 - Troubles divers des plantes

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Agences de financement hors UE : Ontario Ministry of Natural Resources and Forestry

Auteurs et affiliations

• Sato Hiromitsu, Ontario Forest Research Institute (CAN) - auteur correspondant
• Chaste Emeline, CIRAD-PERSYST-UMR Eco&Sols (FRA) ORCID: 0000-0002-8985-7363
• Girardin Martin P., Natural Resources Canada (CAN)
• Kaplan Jed O., University of Hong Kong (CHN)
• Hély Christelle, Université de Montpellier (FRA)
• Candau Jean-Noël, Natural Resources Canada (CAN)
• Mayor Stephen J., Ontario Forest Research Institute (CAN)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/604962/)

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