果树冻害在我国北方高寒区常有发生,给果树生产带来一定影响和损失,轻者影响树势,降低果实品质、产量,重者全株死亡。现将果树冻害的表现、影响因素,防止方法简述如下,供广大栽培者参考。 一、冻害的表现 1.花芽。花芽比叶芽抗冻能力弱,当冬季气温急剧下降或早春气温回暖之后又遇低温时,花芽最易受冻,花芽的抗冻能力与其分化程度有关,分化得越完善,抗冻能力越差。比如顶花芽比腋花芽分化完善,受害就重;短枝比长枝重,内膛枝比外 Frozen fruit trees in northern China often occur in alpine areas, fruit trees produce a certain impact and losses, the light affect the tree potential, reduce fruit quality, yield, severe death of the whole plant. Now fruit frost damage performance, influencing factors, to prevent the method outlined below, for the majority of cultivated reference. First, the performance of frost damage 1. Flower buds. Flower buds are weaker than leaf buds. When the winter temperature drops sharply or the early spring temperatures get warmer, the flower buds are more susceptible to freezing. The flower buds are related to the degree of differentiation, and the better the differentiation, the worse the frost resistance ability. For example, top flower bud differentiation better than the axillary buds, the victim is heavy; short branches than the long branch weight, bore than the outside branch