毛竹的新竹第2年春季换叶,以后每2年换叶1次(称为一度或一届)。竹株换叶年其竹鞭生长旺盛,非换叶年则发笋成竹,这种生长发育特点交错进行。在正常情况下,竹株的年龄分布均匀,竹株中换叶与不换叶的数量大体相等(称为花年竹林或均年竹林),养分的积累不存在多——少——多的年变化规律,故不会出现发笋成竹的大小年现象。如遇气候反常(如夏秋持 Phyllostachys bamboo for the second year in spring leaf replacement, every 2 years after leaf replacement 1 (known as once or a session). Bamboo leaves for its strong whip whip growth, non-leaf year bamboo shoots, this growth and development characteristics staggered. Under normal circumstances, the age distribution of bamboo plants evenly, the number of leaf replacement and no leaf replacement in bamboo is roughly equal (called the annual bamboo or bamboo), the accumulation of nutrients does not exist more - less - more Year changes in law, it does not appear the size of bamboo shoots year phenomenon. In case of climate anomalies (such as summer holding