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http://dx.doi.org/10.5532/KJAFM.2009.11.4.213

Geospatial Assessment of Frost and Freeze Risk in 'Changhowon Hwangdo' Peach (Prunus persica) Trees as Affected by the Projected Winter Warming in South Korea: II. Freezing Risk Index Based on Dormancy Depth as a Proxy for Physiological Tolerance to Freezing Temperature  

Kim, Jin-Hee (Department of Ecosystem Engineering, Kyung Hee University)
Kim, Soo-Ock (Department of Ecosystem Engineering, Kyung Hee University)
Chung, U-Ran (Department of Ecosystem Engineering, Kyung Hee University)
Yun, Jin-I. (Department of Ecosystem Engineering, Kyung Hee University)
Hwang, Kyu-Hong (STA Inc.)
Kim, Jung-Bae (Fruit Research Division, National Institute of Horticultural and Herbal Sciences)
Yoon, Ik-Koo (Fruit Research Division, National Institute of Horticultural and Herbal Sciences)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.11, no.4, 2009 , pp. 213-220 More about this Journal
Abstract
In order to predict the risk of freeze injury for 'Changhowon Hwangdo' peach trees, we used the dormancy depth (i.e., the daily chill unit accumulation during the overwintering period) as a proxy for the short-term, physiological tolerance to freezing temperatures. A Chill-days model was employed and its parameters such as base temperature and chilling requirement were optimized for peach trees based on the 12 observational experiments during the 2008-2009 winter. The model predicted the flowering dates much closer to the observations than other models without considering dormancy depth, showing the strength of employing dormancy depth into consideration. To derive empirical equations for calculating the probabilistic freeze risk, the dormancy depth was then combined with the browning ratio and the budburst ratio of frozen peach fruit branches. Given the exact date and the predicted minimum temperature, the equations calculate the probability of freeze damages such as a failure in budburst or tissue browning. This method of employing dormancy depth in addition to freezing temperature would be useful in locating in advance the risky areas of freezing injury for peach trees production under the projected climate change.
Keywords
Peach trees; Dormancy depth; Freezing risk; Chill-days model; Climate change;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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