Experts share why leaves change and predict when to hit the road for the colorful show.
Athy Mathews loves to watch the sugar maples turn yellow, orange and red at Great Smoky Mountains National Park near her home. “Sometimes you’ll see all three colors on the same leaf,” she says. An associate professor of biology at Western Carolina University, Kathy has spent 10 years studying and predicting peak viewing time for fall colors. She still marvels at the magic of fall, when green leaves transform into brilliant eye-catching copper shades.
This phenomenon occurs when trees stop producing chlorophyll, a green substance in leaves that interacts with sunlight throughout spring and summer to make food for trees to grow. Changing weather conditions in fall tell the trees it’s time to store sugars in the roots for next year’s growth. As the cool temperatures approach, daylight hours shorten and the chlorophyll breaks down, revealing the bright hidden hues.
“It is more efficient for the tree to do this than to maintain its leaves year-round,” Kathy says. Some trees, including maples, even create a new pigment—a deep rich red.
この記事は Birds & Bloom の October/November 2018 版に掲載されています。
7 日間の Magzter GOLD 無料トライアルを開始して、何千もの厳選されたプレミアム ストーリー、9,000 以上の雑誌や新聞にアクセスしてください。
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この記事は Birds & Bloom の October/November 2018 版に掲載されています。
7 日間の Magzter GOLD 無料トライアルを開始して、何千もの厳選されたプレミアム ストーリー、9,000 以上の雑誌や新聞にアクセスしてください。
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