梅花对温度极为敏感,花期受环境影响较大,不仅因地区不同而有差异,且同一地区不同年份也有差异。一般暖冬天气开花早,花期长,冷冬天气开花晚,花期短。根据积温学说,每种植物都有其生长的生物学下限温度即生物学零度,当温度高于下限温度时植物才能开始生长发育。当日平均气温低于下限温度时,为无效温度。高于下限 Plum flower is very sensitive to temperature and its flowering period is greatly influenced by the environment. It not only varies from region to region, but also varies from year to year in the same region. Generally warm winter flowering early flowering, long flowering, cold winter flowering late flowering short. According to the theory of accumulated temperature, each plant has its biological growth limit biological temperature that is zero, when the temperature is lower than the minimum temperature of the plant began to grow. The average temperature of the day is lower than the lower limit temperature, the invalid temperature. Above the lower limit