为什么秋天树叶会变色?  

Why Do Leaves Change Color in the Fall?

出　　处：《时代英语（高三版）》2024年第4期4-5,共2页Times English

摘　　要：在温带和北方森林中,会落叶的乔木和灌木被称为落叶植物,包括杨树、棉白杨、枫树和橡树等。而不会落叶的植物包括松树、云杉、雪松和冷杉等针叶树或常绿树。这两种类型的树木在冬季产生的能量都较少,但针叶树适应性强,树叶的蜡质涂层可以减少水分流失,这有助于它们全年不落叶。Within temperate and boreal forests,trees and shrubs that drop their leaves are called deciduous plants;they include groups such as aspens,cottonwoods,maples and oaks.On the other end of the spectrum are plants that don't shed their leaves-for example,the pines,spruces,cedars and firs that make up the conifers,or evergreens.Both types of trees produce less energy in the winter,but conifers have adaptations,such as a waxy coating to minimize water loss,that help them keep their needles year-round.

关 键 词：水分流失 北方森林 落叶植物 常绿树 乔木和灌木 树叶 针叶树 两种类型 

分 类 号：I26[文学—中国文学]