物候期不仅受遗传物质的制约,也受环境条件的影响。掌握梨各系统各品种的物候期,对于栽培者和育种者来说意义重大。关于梨物候期的研究,多着重于与气温的关系及各物候期间的相关性。小岛(1940)发现梨的开花早晚受3月份气温高低的支配;中川行夫(1972)研究果树开花前气温与开花早晚的相关表明, The phenophase is affected not only by genetic material but also by environmental conditions. It is of great significance to growers and breeders to master the phenology of all varieties of pear systems. The research on the phenophase of pear focuses more on the relationship with the temperature and on the correlation between the phenophases. Kojima (1940) found that pear flowering sooner or later subject to the temperature in March dominated; Nakagawa (1972) study of fruit trees before flowering temperature and flowering correlation shows that,