Comprehensive risk assessment and zoning of low-temperature freezing damage for citrus in Ganzhou

This research evaluated the comprehensive risk of low-temperature freezing damage during the wintering period, so as to provide scientific basis for carrying out meteorological disaster risk management and optimizing planting layout of citrus according to local conditions. Based on the mechanism of meteorological disaster risk formation, hazard, exposure, vulnerability, disaster prevention and mitigation ability indices were constructed using meteorological data, distribution data of citrus planting areas in southern Jiangxi, citrus statistical data, and agricultural production data to conduct comprehensive risk assessment and zoning of low-temperature freezing damage during the wintering period for citrus in Ganzhou City. The results indicated that the hazard of low-temperature freezing damage for citrus showed a characteristic of being low in the middle and increasing from the middle to the northeast and southwest. High-risk areas were mainly concentrated in the areas near Wuyi Mountains and Jiulian Mountains, including Ningdu, Shicheng, Ruijin, and eastern Huichang in eastern Ganzhou and southeastern Quannan in southern Ganzhou. Citrus orchards in Ganzhou were mainly concentrated in the northeastern, southeastern, and southern areas, and the largest citrus planting area as well as its proportion in each county (district) were in Xunwu and Anyuan in southeastern Ganzhou. High vulnerability areas were concentrated in Chongyi in western Ganzhou, Anyuan and Xinfeng in central southern Ganzhou, and Quannan in southern Ganzhou. Low disaster prevention and mitigation ability areas were mainly located in Ningdu and Shicheng in northeastern Ganzhou, Shangyou in western Ganzhou, Anyuan in central southern Ganzhou, and Zhanggong in central Ganzhou. The comprehensive risk of low-temperature freezing damage for citrus was characterized by high risk in the northeastern and southeastern areas, and low risk in the central and central southern areas. The low comprehensive risk areas of low-temperature freezing damage for citrus were mainly located in Longnan, western Dingnan in southern Ganzhou, Xinfeng, Huichang in central southern Ganzhou, western Yudu, most of Ganxian, Nankang, Zhanggong in central Ganzhou, and Dayu in western Ganzhou. The high comprehensive risk areas were mainly located in most of Ningdu, Shicheng, Ruijin, Anyuan, and Quannan. The comprehensive risk zoning results in this research had good reliability and practicality, and had certain directive significance for design of citrus planting.