• Balandier, P., , M. Bonhomme, , R. Rageau, , F. Capitan, , and E. Parisot, 1993: Leaf bud endodormancy release in peach trees: Evaluation of temperature models in temperate and tropical climates. Agric. For. Meteor., 67 , 95113.

    • Search Google Scholar
    • Export Citation
  • Cesaraccio, C., , D. Spano, , R. L. Snyder, , and P. Duce, 2004: Chilling and forcing model to predict bud-burst of crop and forest species. Agric. For. Meteor., 126 , 113. Corrigendum, 129, 211.

    • Search Google Scholar
    • Export Citation
  • Chmielewski, F-M., , A. Muller, , and E. Bruns, 2004: Climate changes and trends in phenology of fruit trees and field crops in Germany, 1961–2000. Agric. For. Meteor., 121 , 6978.

    • Search Google Scholar
    • Export Citation
  • Chung, U., , J. Choi, , and J. I. Yun, 2004: Urbanization effect on the observed change in mean monthly temperatures between 1951–1980 and 1971–2000 in Korea. Climatic Change, 66 , 127136.

    • Search Google Scholar
    • Export Citation
  • De Melo-Abreu, J. P., , D. Barranco, , A. M. Cordeiro, , J. Tous, , B. M. Rogado, , and F. J. Villalobos, 2004: Modelling olive flowering date using chilling for dormancy release and thermal time. Agric. For. Meteor., 125 , 117127.

    • Search Google Scholar
    • Export Citation
  • Doi, H., 2007: Winter flowering phenology of Japanese apricot Prunus mume reflects climate change across Japan. Climate Res., 34 , 99104.

    • Search Google Scholar
    • Export Citation
  • Faust, M., 1989: Physiology of Temperate Zone Fruit Trees. John Wiley and Sons, 338 pp.

  • Jung, J. E., , E. Y. Kwon, , U. Chung, , and J. I. Yun, 2005: Predicting cherry flowering date using a plant phenology model. Korean J. Agric. For. Meteor., 7 , 148155.

    • Search Google Scholar
    • Export Citation
  • Kwon, E. Y., , J. E. Jung, , U. Chung, , S. J. Lee, , G. C. Song, , D. G. Choi, , and J. I. Yun, 2006: A thermal time–driven dormancy index as a complementary criterion for grapevine freeze risk evaluation. Korean J. Agric. For. Meteor., 8 , 19.

    • Search Google Scholar
    • Export Citation
  • Menzel, A., 2002: Phenology: Its importance to the global change community. Climatic Change, 54 , 379385.

  • Piao, S., , J. Fang, , L. Zhou, , P. Ciais, , and B. Zhu, 2006: Variations in satellite-derived phenology in China’s temperate vegetation. Global Change Biol., 12 , 672685.

    • Search Google Scholar
    • Export Citation
  • Seeley, S. D., 1996: Modelling climatic regulation of bud dormancy. Plant Dormancy: Physiology, Biochemistry and Molecular Biology, G. A. Lang, Ed., CAB International, 361–376.

    • Search Google Scholar
    • Export Citation
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Using Thermal Time to Simulate Dormancy Depth and Bud-Burst of Vineyards in Korea for the Twentieth Century

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  • 1 Department of Ecosystem Engineering, Kyung Hee University, Suwon, Korea
  • 2 Department of Applied Plant Science, Chung-Ang University, Anseong, Korea
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Abstract

A winter-season warming trend has been observed in eastern Asian countries during the last century. Significant effects on dormancy and the subsequent bud-burst of deciduous fruit trees are expected. However, phenological observations are scant in comparison with long-time climate records in the region. Chill-day accumulation, estimated from daily maximum and minimum temperature, is a reasonable proxy for dormancy depth of temperate-zone fruit trees. A selected chill-day model was parameterized for the Campbell Early grapevine, which is the major cultivar (grown virtually everywhere) in South Korea. To derive model parameters (threshold temperature for chilling and the chilling requirement for breaking dormancy), a controlled-environment experiment using field-sampled twigs of Campbell Early was conducted. The chill-day model to estimate bud-burst dates was adjusted by derived parameters and was applied using 1994–2004 daily temperature data obtained from the automated weather station in the vineyard at the National Horticultural Research Institute. The model gave consistently good performance in predicting bud-burst of Campbell Early (RMSE of 2.5 days). To simulate dormancy depth of Campbell Early at eight locations in South Korea for the last century, the model was applied using data obtained for each location from 1921 to 2004. Calculations showed that the chilling requirement for breaking endodormancy of Campbell Early can be satisfied by mid-January to late February in South Korea, and the date was delayed going either northward or southward from the Daegu–Jeonju line that crosses the middle of South Korea in the east–west direction. Maximum length of the cold tolerant period (the number of days between endodormancy release and the forced dormancy release) showed the same spatial pattern. Dormancy release for 1981–2004 advanced by as much as 15 days relative to that for 1921–50 at all locations except Jeju (located in the southernmost island with a subtropical climate), where an average 15-day delay was predicted. The cold-tolerant period diminished somewhat at six out of eight locations. As a result, bud-burst of Campbell Early in spring was advanced by 6–10 days at most locations, and interannual variation in bud-burst dates increased at all locations. The earlier bud-burst after the 1970s was due to 1) warming in winter that results in earlier dormancy release (Incheon, Mokpo, Gangneung, and Jeonju), 2) warming in early spring that enhances regrowth after breaking dormancy (Busan and Jeju), and 3) a combination of both (Seoul and Daegu).

Corresponding author address: Prof. Jin I. Yun, 203 Life Science, Kyung Hee University, Yongin 446-701, South Korea. Email: jiyun@khu.ac.kr

Abstract

A winter-season warming trend has been observed in eastern Asian countries during the last century. Significant effects on dormancy and the subsequent bud-burst of deciduous fruit trees are expected. However, phenological observations are scant in comparison with long-time climate records in the region. Chill-day accumulation, estimated from daily maximum and minimum temperature, is a reasonable proxy for dormancy depth of temperate-zone fruit trees. A selected chill-day model was parameterized for the Campbell Early grapevine, which is the major cultivar (grown virtually everywhere) in South Korea. To derive model parameters (threshold temperature for chilling and the chilling requirement for breaking dormancy), a controlled-environment experiment using field-sampled twigs of Campbell Early was conducted. The chill-day model to estimate bud-burst dates was adjusted by derived parameters and was applied using 1994–2004 daily temperature data obtained from the automated weather station in the vineyard at the National Horticultural Research Institute. The model gave consistently good performance in predicting bud-burst of Campbell Early (RMSE of 2.5 days). To simulate dormancy depth of Campbell Early at eight locations in South Korea for the last century, the model was applied using data obtained for each location from 1921 to 2004. Calculations showed that the chilling requirement for breaking endodormancy of Campbell Early can be satisfied by mid-January to late February in South Korea, and the date was delayed going either northward or southward from the Daegu–Jeonju line that crosses the middle of South Korea in the east–west direction. Maximum length of the cold tolerant period (the number of days between endodormancy release and the forced dormancy release) showed the same spatial pattern. Dormancy release for 1981–2004 advanced by as much as 15 days relative to that for 1921–50 at all locations except Jeju (located in the southernmost island with a subtropical climate), where an average 15-day delay was predicted. The cold-tolerant period diminished somewhat at six out of eight locations. As a result, bud-burst of Campbell Early in spring was advanced by 6–10 days at most locations, and interannual variation in bud-burst dates increased at all locations. The earlier bud-burst after the 1970s was due to 1) warming in winter that results in earlier dormancy release (Incheon, Mokpo, Gangneung, and Jeonju), 2) warming in early spring that enhances regrowth after breaking dormancy (Busan and Jeju), and 3) a combination of both (Seoul and Daegu).

Corresponding author address: Prof. Jin I. Yun, 203 Life Science, Kyung Hee University, Yongin 446-701, South Korea. Email: jiyun@khu.ac.kr

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