AI Article Synopsis
- Climate significantly influences the terroir expression in viticulture, with thermal conditions affecting vine development and grape composition.
- A study was conducted in Bordeaux, France, using a network of 90 temperature sensors to analyze temperature variability over 19,233 hectares from 2012 to 2018, focusing on key phenological stages of the Merlot grapevine.
- Results highlighted substantial spatial temperature variability, especially in minimum temperatures, which impacted vine behavior and allowed for enhanced vineyard management through mapping and modeling local temperature effects.
Article Abstract
Climate is a major factor of the physical environment influencing terroir expression in viticulture. Thermal conditions strongly impact vine development and grape composition. Spatializing this parameter at local scale allows for more refined vineyard management. In this study, temperature variability was investigated over an area of 19,233 ha within the appellations of Saint-Émilion, Pomerol, and their satellites (Bordeaux, France). A network of 90 temperature sensors was deployed inside grapevine canopies of this area and temperatures were measured from 2012 through 2018. To determine the effect of temperature on vine development, the phenological stages (budbreak, flowering, and véraison) were recorded on 60 reference plots planted with L. cv. Merlot located near the temperature sensors. Results showed great spatial variability in temperature, especially minimum temperature, with an amplitude of up to 10°C on a given day. The spatial variability of the Winkler index measured in the canopy inside a given vintage was around 320 degree-days. This research explores the main factors affecting spatial variability in temperature, such as environmental factors and meteorological conditions. The impact of temperature on vine behavior was also analyzed. Observed phenological dates were compared to those estimated using the Grapevine Flowering Véraison model. Maps of temperatures and phenological observations were created over this area and provided a useful tool for improved adaptation of plant material and training systems to local temperature variability and change.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7251079 | PMC |
| http://dx.doi.org/10.3389/fpls.2020.00515 | DOI Listing |
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