Why Do Leaves Change Color

Why do leaves change color? Written by Kira Fried.

树叶为什么会变颜色呀？ 作者：基拉·弗里德

So many colors One of nature's most beautiful sights is a forest full of bright fall colors Imagine making art with all those colors of paint

好多好多颜色呀 大自然最美的景色之一，就是满林都是亮闪闪的秋日色彩 想象一下用这些颜色的颜料来画画呀

Leaves in their fall colors are beautiful. Did you ever wonder why a tree's leaves change color? To answer this question, you need to understand the important job that leaves do.

换上秋日色彩的树叶可漂亮啦。 你有没有好奇过，为什么树上的叶子会变颜色呀？ 要回答这个问题，你得先了解树叶的重要工作哦。

Making food. Leaves make food so the tree can grow and have energy. This process is called photosynthesis. Leaves need four things to do their job. One. Leaves need water, which they get from the tree through their stems.

制造食物。 树叶制造食物，这样大树才能生长，才有能量。 这个过程叫做光合作用。 树叶完成这项工作需要四样东西。 第一，树叶需要水，它们通过叶柄从大树那里获得水分。

Two, leaves also need a gas called carbon dioxide. They take in carbon dioxide from the air around them. Three, all plants use a chemical called chlorophyll for photosynthesis. Chlorophyll gives leaves their green color. Many parts of green plants have some chlorophyll in them. Leaves have the most chlorophyll of all the parts.

第二，树叶还需要一种叫做二氧化碳的气体。 它们从周围的空气中吸收二氧化碳。 第三，所有植物都会用到一种叫做叶绿素的化学物质来进行光合作用。 叶绿素让树叶呈现出绿色。 绿色植物的很多部位都含有少量叶绿素。 其中树叶的叶绿素含量是最高的。

4. Leaves need sunlight for photosynthesis. Sunlight and chlorophyll work together. They turn water and carbon dioxide into a kind of sugar. This sugar is the food that gives plants energy. When they make food, trees also give off a gas called oxygen. Animals need oxygen to live.

4. 树叶进行光合作用需要阳光。 阳光和叶绿素协同工作。 它们把水和二氧化碳转化成一种糖。 这种糖就是给植物提供能量的食物。 树木制造食物的时候还会释放一种叫做氧气的气体。 动物生存都需要氧气哦。