The Complete Book of 100,000 Reasons Why
Favlit. ten thousand reasons why
为什么树叶秋天变黄？
1、树叶中的叶绿素在秋天会分解，因为光照减少，植物为了节省能量，停止合成叶绿素。
2、叶绿素分解后，叶黄素和胡萝卜素等黄色色素会显露出来，使树叶呈现黄色。
3、温度下降会加速叶绿素的分解，这是秋天树叶变黄的一个主要原因。
4、水分减少也会影响树叶的生理活动，导致叶绿素提前分解，黄色更加明显。
5、不同树木的叶绿素分解速度不同，因此秋天树叶变黄的时间和颜色也会有差异。
总之，树叶秋天变黄是由于叶绿素分解、黄色色素显露、温度和水分变化等多种因素共同作用的结果。
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