柑桔喜温暖湿润的气候，是热带、亚热带常绿果树，也是我国南方重要果树之一。安徽为柑桔北缘地区，由于近些年来南果北移的步伐加快，安庆市辖的几个县从1077年以来陆续引进温州蜜柑等耐寒品种进行栽培。为减轻和避免柑桔遭受冻害，有必要探明柑桔冻害原因，寻求防寒对策。一 Citrus like a warm and humid climate, tropical, subtropical evergreen fruit trees, but also one of the important fruit trees in southern China. As the northern margin of citrus, Anhui has accelerated its pace of moving northward in recent years. Several counties under the jurisdiction of Anqing have successively introduced hardy varieties such as Wenzhou Satsuma for cultivation since 1077. In order to reduce and avoid citrus suffered frost damage, it is necessary to identify the causes of citrus frost damage and seek cold measures. one