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 major meteorological disasters 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 County, Shicheng County, Ruijin City, and eastern Huichang County in eastern Ganzhou and southwestern Quannan County in southwestern Ganzhou. Citrus orchards in Ganzhou were mainly concentrated in the northeast, southeast, and southern areas, and the largest citrus planting area and proportion were in Xunwu County and Anyuan County in southeastern Ganzhou. High vulnerability areas were concentrated in Chongyi County in western Ganzhou and Anyuan County, Xinfeng County, and Quannan County in central southern Ganzhou. Low disaster prevention and mitigation ability areas were mainly located in Ningdu County and Shicheng County in northeastern Ganzhou, Shangyou County in northwestern Ganzhou, Anyuan County in central southern Ganzhou, and Zhanggong District in central western Ganzhou. The comprehensive risk of low-temperature freezing damage for citrus was characterized by high risk in the northeast and southeast, 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 City, western Dingnan County, Xinfeng County, Huichang County in southern Ganzhou, and western Yudu County, most of Ganxian District, Nankang District, Zhanggong District, Dayu County in central Ganzhou. The high comprehensive risk areas were mainly located in southern Ningdu County, Shicheng County, Ruijin City, Anyuan County, and Quannan County. The comprehensive risk zoning results in this research had good reliability and practicality, and had certain directive significance for design of citrus planting.