High Temperature Heat Damage Grade Index of Tea Plants and Its Distribution Characteristics in Southern Yangtze River and South China

Li Xin; Wang Peijuan; Tang Junxian; Wang Qi; Li Yang; Huo Zhiguo

doi:10.11898/1001-7313.20240105

Vol.35, NO.1, 2024

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Li Xin, Wang Peijuan, Tang Junxian, et al. High temperature heat damage grade index of tea plants and its distribution characteristics in Southern Yangtze River and South China. J Appl Meteor Sci, 2024, 35(1): 57-67. DOI: 10.11898/1001-7313.20240105.

Citation:

Li Xin, Wang Peijuan, Tang Junxian, et al. High temperature heat damage grade index of tea plants and its distribution characteristics in Southern Yangtze River and South China. J Appl Meteor Sci, 2024, 35(1): 57-67. DOI: 10.11898/1001-7313.20240105.

Citation:

Li Xin, Wang Peijuan, Tang Junxian, et al. High temperature heat damage grade index of tea plants and its distribution characteristics in Southern Yangtze River and South China. J Appl Meteor Sci, 2024, 35(1): 57-67. DOI: 10.11898/1001-7313.20240105.

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High Temperature Heat Damage Grade Index of Tea Plants and Its Distribution Characteristics in Southern Yangtze River and South China

DOI: 10.11898/1001-7313.20240105

Li Xin¹,
Wang Peijuan^{1
,
,},
Tang Junxian^{1, 2},
Wang Qi¹,
Li Yang¹,
Huo Zhiguo^{1, 2}

1.
Chinese Academy of Meteorological Sciences, Beijing 100081
2.
Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing 210044

Received Date: 2023-09-02
Rev Recd Date: 2023-11-14
Publish Date: 2024-01-31

Abstract

Abstract

With the trend of global climate change, it is important to study the high temperature heat damage of tea plants and analyze the spatial and temporal distribution characteristics to warn damage early and reduce production losses. An index is established based on daily maximum air temperature and historical heat damage disaster records at 510 meteorological stations over tea regions in Southern Yangtze River and South China from 1961 to 2022, to determine and verify the extent of high temperature heat damage, using methods of disaster inversion and K-means clustering analysis method. The spatial and temporal distribution characteristics of high temperature heat damage are analyzed. The total days with moving average of 14-consecutive-day maximum temperature above 34.5 ℃ are statistically analyzed, and for mild, moderate and severe high temperature heat damage, the value is in the range of 1-17 d, 18-38 d and above 38 d, respectively. The accuracy rate of complete compliance with the validation sample is 73.9%, and the accuracy rate of basic compliance is 91.3%. The total number of heat damage on tea plants in Southern Yangtze River and South China shows fluctuating changes from 1961 to 2022. The total number of heat damage on tea plants in tea regions of Southern Yangtze River and South China is the lowest in 1999 and 1997, respectively, while numbers are the highest in 2021 for both tea regions. Compared to tea regions of Southern Yangtze River, there are more high temperature heat damages in South China, especially mild high temperature heat damages. Moreover, the number of high temperature heat damage on tea plants in South China shows a significant increasing trend in the past 62 years, but the trend of changes in the number of high temperature heat damage on tea plants in most tea regions of Southern Yangtze River is not significant.

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References(47)

Figures and Tables

Fig. 1 Target area and distribution of stations

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Fig. 2 Moving average of 14-day maximum temperature at Xiapu of Fujian and Pingyang of Zhejiang in 2022

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Fig. 3 High temperature heat damage frequency in tea region of Southern Yangtze River and South China from 1961 to 2022

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Fig. 4 Frequency distribution of different grades of high temperature heat damage in tea region of Southern Yangtze River and South China

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Fig. 5 Frequency trend of different grades of high temperature heat damage in tea region of Southern Yangtze River and South China

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Table 1 Description and classification of high temperature heat damage of tea plants(from Reference [36])

等级	灾情描述
轻度	部分受灾、受损, 受害茶树仅部分叶片出现变色、枯焦，茶枝上部芽叶仍呈现绿色
中度	成灾、部分绝收，受害茶树多数叶片变色、枯焦或脱落，但茶枝顶端叶片或茶芽虽变色但尚未完全枯死
重度	大量减产、绝收，受害茶树叶片变色、枯焦脱落，且蓬面枝条已出现干枯甚至整株死亡

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Table 2 Number of validation samples and verification results of grade index of high temperature heat damage of tea plants

灾情等级	验证结果			样本量
灾情等级	完全符合	基本符合	与实际灾情不符	样本量
轻度	5	0	0	5
中度	3	1	1	5
重度	9	3	1	13
样本量	17	4	2	23

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