Cultivar Characteristics of Last Frost during Apple's Flowering Period in Xigaze,Xizang from 2002 to 2023
[Objective]The study of frost climate risk in apple's flowering period provides scientific and technological sup-port for effectively preventing the impact of frost disaster on local apple production.[Methods]Taking the daily minimum tem-perature as the frost index,the linear tendency estimation,Mann-Kendall test and R/S analysis were used to analyze the culti-var characteristics and climate risk index of the final frost of apple flowering period in Xigaze from 2002 to 2023.[Results]The flowering period of apple in Xizage showed a delay trend,with a rate of 1.58-6.69d per decade,which was most obvious at the full bloom date.The mutation of later flowering period occurred in the middle and late of the 2000s,and the possibility of continuous delay of flowering period in the future was higher.The frequency of each grade of last frost during the apple flower-ing period was 54.5%to 95.5%,and the climate risk index of final frost during the flowering period reached 4.41,which was significantly higher than that of the main apple producing areas in the north of China.[Conclusion]Under the background of global warming,the date of the final frost in Xizage was advanced,the apple's flowering period delayed,and the climate risk of the final frost in flowering period would be reduced.
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