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Evolution in climate and berry composition for the main grape varieties cultivated in the Loire Valley Grapevine physiology and berry composition are related to the physical environment. For this reason, climate change is raising many questions concerning viticulture and consequently the quality and typicity of wine. The analysis of meteorological data of several weather stations situated throughout the Loire Valley clearly depicts a significant increase of temperature during the last 60 years. However, this increase has not been uniform over time, neither among the different weather stations. The bioclimatic indices, which characterise the viticultural potential of a region in terms of temperature, have increased significantly. The Huglin Index indicates that the Loire Valley has shifted to a warmer climate. As a result, grapevine physiology and berry composition of the main grape varieties cultivated in the Loire Valley are impacted. Harvest dates have advanced by two weeks during the last 40 years. Furthermore, even though different grape varieties are cultivated in different sub-regions of the Loire Valley, the same tendencies of an increase in sugar concentration and a decrease in titratable acidity are observed.

Évolution du climat et de la composition des raisins des principaux cépages cultivés dans le Val de Loire