关键词: 胡柚（Citrus paradisi cv.Changshanhuyou）, 冻害, 等级划分, 风险区划

Abstract: To evaluate the risk of freezing damage of Changshan Grapefruit（Citrus paradisi cv.Changshanhuyou）,and to provide scientific guidance for Grapefruit production in Changshan county and the prevention of freezing damage. Through the natural disaster risk index and the analytic hierarchy process,the dangerousness of freezing disaster-causing factors,the environmental susceptibility of the disaster,the vulnerability of the disaster-bearing body and the ability of disaster prevention and mitigation of freezing damage were studied. According to the risk division map of Grapefruit in Changshan county,it was found that the distribution of the freezing damage in Changshan county was uneven. The risk of freezing damage increases from southwest to northeast. The southwest region is the lowest risk area of freezing damage,and more suitable for the cultivation of grapefruit. In contrast,the northeastern and southern mountainous hills is a highly risk area of frost damage,so it is less suitable for the cultivation of Grapefruit. Results provide guidance for the Grapefruit cultivation and freezing disaster prevention and reduction for grapefruit.

Key words: grapefruit（Citrus paradisi cv.Changshanhuyou）, freezing damage, grading, risk zoning