Relationship between viticultural climatic indices and grape maturity in Australia

Article

Jarvis, C., Barlow, E., Darbyshire, R., Eckard, R. and Goodwin, I.. 2017. "Relationship between viticultural climatic indices and grape maturity in Australia." International Journal of Biometeorology: the description, causes, and implications of climatic change. 61 (10), pp. 1849-1862. https://doi.org/10.1007/s00484-017-1370-9
Article Title

Relationship between viticultural climatic indices and grape maturity in Australia

ERA Journal ID1968
Article CategoryArticle
AuthorsJarvis, C. (Author), Barlow, E. (Author), Darbyshire, R. (Author), Eckard, R. (Author) and Goodwin, I. (Author)
Journal TitleInternational Journal of Biometeorology: the description, causes, and implications of climatic change
Journal Citation61 (10), pp. 1849-1862
Number of Pages14
Year2017
PublisherSpringer
Place of PublicationNew York, United States
ISSN0020-7128
1432-1254
Digital Object Identifier (DOI)https://doi.org/10.1007/s00484-017-1370-9
Web Address (URL)https://link.springer.com/article/10.1007%2Fs00484-017-1370-9
Abstract

Historical temperature data and maturity records were analyzed for 45 vineyard blocks in 15 winegrowing regions across Australia in order to evaluate the suitability of common viticultural indices to estimate date of grape maturity. Five temperature-based viticultural indices (mean January temperature, mean growing season temperature, growing degree days, biologically effective degree days, Huglin Index) along with four springtime temperature indices (mean and maximum temperature summations for September, October, and November; growing degree days and biologically effective degree days modified to include September) were compared to maturity data in order to investigate index relationship to observed maturity timing. Daily heat summations for the months of September, October, and November showed the best correlation to day of year of maturity, suggesting that springtime temperatures are important relative to the timing of grape maturity. Mean January temperature, a commonly used index, had the poorest correlation with day of year of maturity of all the indices included in this study. Indices that included the month of April had poorer correlation than indices that shifted the months included in the growing season to be from September to March inclusive. Calculated index
values for the past 30 years for every region included in this study showed increasing temporal trends to various degrees, indicating that all regions studied are experiencing warming temperatures during the growing season. These results emphasize the need to reevaluate viticultural indices in the context of a changing climate.

Keywordstemperature, phenology, spring, climate variability, warming
ANZSRC Field of Research 2020300805. Oenology and viticulture
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Byline AffiliationsUniversity of Melbourne
Agriculture Victoria
Institution of OriginUniversity of Southern Queensland
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