果树的生命周期一般包括幼龄期、结果始期、盛果期和衰老期几个阶段。幼龄期是投资较多的时期,到了盛果期才开始大量结果。决定盛果期长短的因素很多,如立地条件、管理水平以及穗砧组合等。建国以来,我区果树发展较快。1981年全区苹果总产已达3200余万斤。但一些苹果树已有开始衰退 The life cycle of fruit trees generally includes several stages of young age, fruiting period, fruit-bearing stage and aging stage. Young age is a period of investment is more, to the full fruit period began a large number of results. There are many factors that determine the full fruit period, such as site conditions, management level, and combinations of ears and anvils. Since the founding of our country, fruit trees in our region developed rapidly. In 1981 the region’s total output of apple has reached more than 3200 kilograms. But some apple trees have begun to decline