Color: green, red after autumn.
Cause of discoloration: Leaves contain a lot of chlorophyll, so the color is green. In autumn, the weather gets cold, the growth rate of trees slows down, and the chlorophyll in leaves is gradually decreasing. Finally, only lutein is left, and the leaves turn yellow. Maple leaf contains a special substance-anthocyanin, which is just the opposite of chlorophyll. As the weather turns cold, the number gradually increases, making the maple leaves turn red.
Extended data
The use of maple trees
1, wood
Platanus acerifolia is one of the most valuable high-grade timber. Yellow or white, although the annual rings can be distinguished, sapwood and central part are difficult to distinguish because of the same color. Wood with moderate weight, elasticity, toughness and firmness is not easy to shrink. Strong buckling resistance. Maple has been used only for internal expansion projects and furniture. Its surface processing is easy, but polishing, pickling and coloring are difficult. Drawing is also easy.
2.maple syrup
Acer saccharum is rich in juice and can be boiled to make maple syrup or maple syrup or maple sugar. It takes 40 liters of sugar maple syrup to make one liter of maple syrup. Close relatives of sugar maple can also be made into syrup, but the yield is not as good as that of sugar maple.
3. food
Maple seeds are sometimes boiled in water to remove bitterness and then added to coffee.
Baidu encyclopedia-maple tree