To understand why and think back to photosynthesis and chlorophyll, photosynthesis is the process by which plants or trees create their own energy through sunlight, water and carbon dioxide, chlorophyll is a key component of this process and as the reason leaves have a green color photosynthesis comes to a halt as the amount of daylight shorts during fall telling the tree to shut down for winter, the chlorophyll breaks down when this happens.
要理解為什麼,請回想一下光合作用和葉綠素,光合作用是植物或樹木通過陽光、水和二氧化碳創造自身能量的過程,葉綠素是這一過程的關鍵組成部分,作為葉子具有綠色的原因,光合作用在秋季的日照時間短,告訴樹木要關閉過冬,葉綠素在這種情況下分解。