The Characteristics of Chilling Requirement and Limit Temperature of Jujube in the Middle Section of Taihang Mountains in Hebei Province

doi:10.11923/j.issn.2095-4050.cjas2023-0052

Abstract

Abstract:

Based on the daily temperature data from 1991-2021 of the 11 counties in the middle section of the Taihang Mountains, using the trend analysis and Pearson coefficient, the limit temperature of 7.2℃ for dates entering dormancy and the chilling requirement during dormancy of the jujube in the middle section of the Taihang Mountains were analyzed. The results showed that the average date of the initial day when temperature steadily dropped to 7.2℃ in the middle part of Taihang Mountains was November 10^th, the earliest date was November 9^th, the latest date was November 11^th, and the changes were insignificant. The average date of the initial day when temperature steadily rose to 7.2℃ was March 18^th, the earliest date was March 15^th and the latest date was March 20^th, which was a significant change in trend of 4.2 d per 10 years. The average days of the temperature steadily dropped to 7.2℃ was 128.8 d, the minimum number of days was 125.1 d, and the maximum number of days was 132.3 d. The change in trend was 5.1 d/10 a, which was a significant change. For the temperature dropped steadily to 7.2℃ throughout the day, Quyang and Fuping were the earliest area; among the initial days when the temperature rosed steadily to 7.2℃, Luquan and Zanhuang were the earliest area. The consecutive days which the temperature fell steadily to 7.2℃ were the least in Luquan, western Yuansi and Zanhuang. The change in trend of consecutive days in Quyang decreases by 4.0d per 10a; there was a low value area of the chilling requirement in Luquan, Zanhuang and Lincheng when the temperature steadily dropped to 7.2℃. There was a low value area of the chilling requirement in Quyang and the north of Fuping, when the temperature steadily dropped between 0℃ and 7.2℃. This study can provide a clearer understanding about chilling requirement of the jujube in the middle part of the Taihang Mountains in Hebei Province, which can provide scientific guidance for planting different varieties of jujube trees in this region.

Key words: the middle section of Taihang Mountains, jujube, dormancy, chilling requirement, change

LIANG Chunwang, ZHANG Kejia, YANG Lina, JIA Qiulan, HAN Xiangyang, WU Yunlong. The Characteristics of Chilling Requirement and Limit Temperature of Jujube in the Middle Section of Taihang Mountains in Hebei Province[J]. Journal of Agriculture, 2023, 13(8): 81-88.

Figures/Tables 16

References 20

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项目	阜平	井陉	临城	灵寿	平山	曲阳	唐县	行唐	元氏	赞皇	鹿泉
终日日序	312.7	313.2	314	313.6	313.7	312.1	313.2	313.2	313.3	314.3	314.4
终日趋势	0.07	0.10	0.10	0.10	0.09	0.04	0.09	0.07	0.09	0.13	0.12

项目	阜平	井陉	临城	灵寿	平山	曲阳	唐县	行唐	元氏	赞皇	鹿泉
终日日序	312.7	313.2	314	313.6	313.7	312.1	313.2	313.2	313.3	314.3	314.4
终日趋势	0.07	0.10	0.10	0.10	0.09	0.04	0.09	0.07	0.09	0.13	0.12

项目	阜平	井陉	临城	灵寿	平山	曲阳	唐县	行唐	元氏	赞皇	鹿泉
初日日序	77.9	76.8	76.3	75.9	76.3	78.9	76.6	78.3	76.7	75.3	73.7
初日趋势	-0.40*	-0.38*	-0.44*	-0.46*	-0.41*	-0.36*	-0.49*	-0.45*	-0.37*	-0.44*	-0.47*

项目	阜平	井陉	临城	灵寿	平山	曲阳	唐县	行唐	元氏	赞皇	鹿泉
初日日序	77.9	76.8	76.3	75.9	76.3	78.9	76.6	78.3	76.7	75.3	73.7
初日趋势	-0.40*	-0.38*	-0.44*	-0.46*	-0.41*	-0.36*	-0.49*	-0.45*	-0.37*	-0.44*	-0.47*

项目	阜平	井陉	临城	灵寿	平山	曲阳	唐县	行唐	元氏	赞皇	鹿泉
持续日数	130.8	129.4	128.1	127.9	128.4	132.3	129.2	130.6	128.8	126.8	125.1
持续日数趋势	-0.46*	-0.48*	-0.55*	-0.55*	-0.50*	-0.40*	-0.59*	-0.51*	-0.45*	-0.57*	-0.59*