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越冬期间的低温冻害是影响柑桔生产的主要农业气象灾害。解放以来,我国曾出现过三次影响范围较大的严重冻害。1977年全国1400万株柑桔受冻,占受冻地区株数的72.30％。造成柑桔周期性冻害的主要气象因子是冬季的极端最低温度强度、持续时间和降温速率以及平流降温形成的寒风。其中,极端最低温度发生的机率是柑桔生产的限制因子。如何根据北缘柑桔产区低温冻害特点,充分利用优越的环境条件,采取改良小气候等综合性保护栽培措施,使北缘地区柑桔生
Low-temperature frost damage during winter is the main agricultural meteorological disaster affecting citrus production. Since the liberation, China has witnessed three serious frost damage cases with a large impact. In 1977, 14 million citrus fruits were frozen in the country, accounting for 72.30% of the number of frozen areas. The main meteorological factors that cause citrus periodic frost damage are the extreme minimum temperature intensity in winter, the duration and cooling rate, and the cold wind formed by advection cooling. Among them, the probability of occurrence of extreme minimum temperature is a limiting factor for citrus production. How to make full use of superior environmental conditions according to the characteristics of low temperature frost damage in citrus producing areas in the north of the country, adopting integrated microclimate measures such as improving microclimate,