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由于气候的变化无常,我国北方地区每年都有寒流发生,因其侵袭的范围和强度不同,所以经常程度不同地对果树造成冻害,轻则伤芽,重则死树,严重时可毁灭全园。近几年这种情况在我市葡萄生产上表现比较突出,尤其1999年冬季我市最低气温达-14.7℃,并且持续3～4天,因而造成近400hm~2葡萄发生冻害,直接经济损失达1500万元。针对发生的严重灾害,我们进行了认真的调查分析,认为以下几方面是引起冻害的主要原因。
Due to the climate change, cold spell occurs in the northern part of our country every year. Because of the different extent and intensity of invasion, the fruit trees often suffer from frostbite at varying degrees, while the dead trees at the worst and the dead trees at worst, . In recent years, the situation of grape production in our city more prominent, especially in the winter of 1999 the city minimum temperature of -14.7 ℃, and lasts 3 to 4 days, resulting in nearly 400hm ~ 2 grape freeze damage, the direct economic losses of up to 15 million yuan. In response to the serious disaster, we conducted a serious investigation and analysis, that the following aspects are the main cause of frost damage.