一、引言 柑桔是典型的亚热带植物,在中亚热带地区栽培,生长良好,基本上无冻害。在北亚热带地区栽培,易遭冻害。浙江省钱塘江口以北地区,属北亚热带季风气候,由于冬季温度低,柑桔经常受冻,所以栽培极少。但是,海盐县澉浦乡南北湖村,栽培柑桔已有五百多年历史,冻害较轻,近几年来,年产柑桔三百吨左右(即六千担),主要是利 I. INTRODUCTION Citrus is a typical subtropical plant cultivated in the subtropical region with good growth and basically no frost damage. Cultivation in the northern subtropics, vulnerable to frost damage. The area north of Qiantang River estuary in Zhejiang Province belongs to the northern subtropical monsoon climate. Due to the low temperature in winter, citrus is often frozen, so cultivation is extremely rare. However, the Nanbeihu Village, Xupu Township, Haiyan County has a history of more than 500 years of citrus cultivation and relatively low frost damage. In recent years, it has produced about 300 tons of citrus per year (ie 6,000 tons)