【摘 要】
：
1999年冬到 2 0 0 0年春 ,由于气候多变 ,致使葡萄发生不同程度的冻害 ,造成严重损失 ,通过调查仅涿鹿县受冻面积达 2 0 0多ｈｍ2 ,整株死亡达 1 0 0ｈｍ2 ,给果农造成很大的经济损失
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1999年冬到 2 0 0 0年春 ,由于气候多变 ,致使葡萄发生不同程度的冻害 ,造成严重损失 ,通过调查仅涿鹿县受冻面积达 2 0 0多ｈｍ2 ,整株死亡达 1 0 0ｈｍ2 ,给果农造成很大的经济损失。1 发生冻害的原因1 1 低温 低温是造成冻害的主要原因。据涿鹿县气象局资料 ,从 2月下旬
In the winter of 1999 and the spring of 2000, due to the changing climate, grapes suffered various degrees of frost damage and caused serious losses. Only the frozen area of Zhuolu County reached more than 200 hm2 and the whole plant died down to 100hm2 , Causing great economic losses to the farmers. 1 causes of frost damage 1 1 low temperature is the main cause of frost damage. According to Zhuolu County Meteorological Bureau data, from late February
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