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RESEARCH PRODUCT

Analyse spatiale de l’évolution du risque de gel sur la vigne en Bourgogne-Franche-Comté

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The warming undergone by the global climate does not necessarily entail a decrease in frost risk in agriculture/viticulture. Since both plant and climate are likely to evolve under changing environmental conditions, plant vulnerability and the meteorological phenomenon (frost) should be considered jointly when assessing the evolution of frost risk. This study aims at documenting the spatial and temporal frost risk changes in the winegrowing subregions of Bourgogne-Franche-Comté. The period between budburst and the last spring frost occurrence date has been considered as the most vulnerable for grapevines. We considered a plant as being stressed by a frost event when the temperature drops below -1°C after budbreak. Three quantitative parameters are used to spatially quantify frost risk: the number of frost events after budbreak, the frequency of years with at least one frost event after budbreak and the intensity of the frost stress. According to our results frost risk in the vitivinicultural subregions of Bourgogne-Franche-Comté tends to either maintain or increase by 2050.