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Et demain? Robustesse des stratégies innovantes de gestion des adventices face au changement climatique

Abstract : To evaluate the resilience of innovative weed management strategies, the impact of climate change was investigated with a regionalized simulation approach. First, we checked that the protocol for dynamic regionalisation correctly mimicked the climate observed over 1980-2016. Then, the protocol was applied to two periods (2010-2040 and 2069-2099). Finally, we compared existing and prospective cropping systems in terms of weed management and impacts on crop production and biodiversity, with these two climate trajectories. To do so, 44 cropping systems from 5 regions were simulated with the weed dynamics model FlorSys. Our results show that surface temperature will increase in average by approx. 4°C at the end of the century with the RCP8.5 trajectory. Three cropping system types were identified in response to these climate changes, those whose weed harmfulness for crop production (1) decreased, (2) increased, particularly with trajectory RCP8.5 from 2069-2099, (3) was average but whose weed contribution to biodiversity increased. The study allowed identifying the management levers essential for innovative cropping systems that are robust relatively to climate change.
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Nicolas Cavan, Thierry Castel, Julien Pergaud, Frédérique Angevin, Nathalie Colbach. Et demain? Robustesse des stratégies innovantes de gestion des adventices face au changement climatique. Innovations Agronomiques, INRAE, 2020, 81, pp.209-225. ⟨hal-03105517⟩

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