树叶为什么在秋天会变色?  

Why Do Leaves Change Color in the Fall?

作　　者：Live Science 

机构地区：[1]不详

出　　处：《疯狂英语（初中天地）》2023年第11期53-54,共2页Crazy English

摘　　要：初秋时节,天气情况开始变化:天气变凉爽,夜晚温度下降,但尚未结冰,白昼缩短。总的来说,植物通过叶绿素从阳光中获取能量的机会减少了,因此落叶树开始减少生产叶绿素,以保持生命力。In early fall,the weather conditions start to change:It gets cooler-with crisp,but not freezing,nights-and the duration of daylight is reduced.1)Collectively,there’s less sunlight for plants to 2)harvest using the chlorophyll in their leaves,so 3)deciduous trees begin to pull back their investment in keeping them alive.

关 键 词：落叶树 叶绿素 天气情况 生命力 

分 类 号：I26[文学—中国文学]