ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Characteristics of Major Agricultural Meteorological Disasters for Rice under new periodical Climate Change in China
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Abstract:
Based on rice phenological stages and meteorological observations from nationwide single-season and double-season rice regions, combined with major agro-meteorological disaster indicators, disaster intensity and hazard indices were constructed to analyze the changing characteristics of heat stress, cold stress, drought, and compound heat and drought stresses from 1991 to 2024. The results indicate that in the period of 1991-2024, heat stress in single-season rice has significantly intensified, with the peak observed in 2022 while the area percentage exposed to heat stress. Meanwhile, early rice heat stress has shown fluctuating changes and has been gradually increasing since 2017. Obstruction-type chilling injury in rice in Northeast China has been weakened, while it weakens after 2017 and merely occurs in recent two years. The intensity of cold dew wind in late rice has been stronger after 2017 and peaked in 2020 after that it decresed. Drought has exhibited large fluctuations, with the most severe conditions occurring in single-season and late rice in 2022, and the area percentage exposed to drought in single-season ric and late rice is higher than that in early rice. The compound heat and drought stresses in single-season rice has been more severe than in early rice. At the spatial scale, areas for severer heat stress in single-season rice have been concentrated in northeastern Sichuan, central Chongqing, and eastern Hubei, while for early rice, they have been located in southeastern Hunan central Zhejiang, central-southern Jiangxi, and central Fujian where the heat stress intend to intensify. The obstruction-type chilling injury in Northeast China have been identified from southwest to northeast, and cold dew wind for late rice tends to increase from south to north. The drought in single-season rice is severe in Northeast China in comparison with that in southern areas, and that in early rice decreases from south to north which is opposite in late rice. High intensity for compound heat and drought stresses in single-season rice have been concentrated in northeastern Sichuan, central Chongqing, eastern Hubei and western Hunan, while for early rice, they have been located in northern Zhejiang and southeastern Jiangxi. In these areas exposed to high intensity of disasters, the hazard is generally heavy, which can help guide for taking prevention of specific disasters. Keywords: rice, heat stress, cold stress, drought, combined disaster, intensity index
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