进入春季后气温逐渐回升,果树打破休眠,树液流动,花芽萌发,开始了新一年的生长。但春季气温的忽高忽低,特别是气温突然降至-4℃以下时常给果树花芽造成霜冻,直接影响到产量。果树花芽冻害的发生因树种与品种的不同,果园所处地形、小环境气候不同,栽培管理水平不同,物候期不同而存在差异。不同树种间,以杏树花芽受害最重,桃、梨、核桃次之,苹果较轻;同一树种,品种不同冻 Into the spring temperatures gradually picked up, fruit trees break dormancy, sap flow, flower buds, began a new year of growth. However, the temperature fluctuated in spring and autumn, especially when the temperature dropped suddenly below -4 ℃, which often caused frosts in flower buds of fruit trees and directly affected the output. Fruit flower bud frost damage occurs due to the different species and varieties of orchards in the topography, small climate, different levels of cultivation and management, there are differences in phenology. Among the different species, flower buds of apricot are the worst, peach, pear and walnut are the second, and apples are lighter. The same tree species with different frozen