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Why Leaves Change Color?
As the seasons change from summer to winter, the leaves gradually changes to red, purple, orange and yellow. It is the result of chemical process which occur on the leaf. During the spring and summer, the cells on the leaf that contains cholophyll are responsible for food-manufacturing process. The leaf absorbs chemical energy from the sunlight, and then it transform carbon dioxide and water to carbohydrates, such as sugar and starch. The chlorophyll, which gives the leaf its green color, covers other colors such as yellow to orange, carotenes, and xanthophyll pigments. In the fall, because of the change in temperature and the lenght of the daylight the leaf stop the food-making process and the chlorophyll breaks down. As the green color disappears, and the yellow to orange colors become visible. In addition, chemical changes also occur, which gives additional colors such as red anthocyanin pigments, reddish and purplish or brilliant orange. Some trees show only yellow foliage because of the mixing amount of the chlorophyll residue and other pigments in the leaf during the fall season;furthermore,the weather affects the color intensity of the leaf. There are factors that affects the degree and lenght of fall color. Low temperature above freezing develope anthrocyanin produces bright reds in maple;however, early frost will weaken the bright red color. while rainy and overcast days tend to intensify the fall color, clear, dry and cool not freezing will give the perfect the Autum colors.