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我国东北部无霜期较短,温度较低,生长季大于10℃的活动积温较少。高温年容易获得高产,低温年往往歉收,温度条件对农业生产影响很大,低温冷害是农业生产上的一个严重问题。建国以来,较大范围的低温冷害就发生过8次,近十多年里严重低温冷害发生的频率相当高。 实地考察表明,冷害程度的地区差异是很大的、分析冷害危险程度的分布规律,可以为因地制宜制定防御对策提供科学依据。
Frost-free period in Northeast China is relatively short, the temperature is lower, the growing season is greater than 10 ℃ less active accumulated temperature. It is easy to get high yield in high temperature, low temperature is often poor harvest, temperature conditions have a great impact on agricultural production, low temperature chilling injury is a serious problem in agricultural production. Since the founding of the People’s Republic of China, a large number of low-temperature chills have occurred eight times. In the past ten years, the frequency of serious chilling accidents has been quite high. The field investigation shows that there are great regional differences in the degree of chilling damage. Analyzing the distribution of the degree of chilling hazard can provide a scientific basis for formulating defense measures according to local conditions.