植物开花结果是再寻常不过的事情。但是,竹子开花却极为罕见,几十年才会遇到一次,而且往往伴随干旱之年,尤其竹子通常同时开花,然后一片竹林全部死亡。为什么竹子开花后会死亡呢?植物的根、茎、叶叫做营养器官,它们的生长称为营养生长。植物的花、果实、种子叫生物器官,它们的生长称为生殖生长。植物的开花习性开分为两大类,多次开花植物,像苹果、梨每年都会开花结果,还有一类就是一次开花植物,例如竹子,一次开花植物一生就开一次花,其特点是生长前期营养生长占优势,当营养生长达到一定阶段后,生殖生长就渐渐转向优势,最后开花结果,因为开花结果要消耗掉大量的有机养料,而这些养料来自根、茎、叶,所以开花结果后营养器官中贮存的养料大部分被消耗,不能再生活下去,就逐渐枯死了。竹子开花的原因有的是因为年龄的自然衰老,是竹子生长发育从量变到质变的正常生理现象。还有是因为天气干旱,土壤水分缺乏,竹株体内糖类浓度增高,从营养生长转向生殖生长,加速衰老周期。竹子的果实是啮齿动物的主要食物,因为几十年只接一次籽,动物们不知道什么时间开始,竹子有效的避免了种子被吃掉的命运,这也是竹子在长期进化中演变而来的特性。
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