What are the characteristics of the seasonal changes of maple leaves?

The green change of leaves comes from chlorophyll, which contains a lot of pigments and nutrients such as chlorophyll, lutein, anthocyanin and sugar.

In autumn, the weather gets cold, the temperature drops, the synthesis of leaf green is blocked, and the green pigment in leaves decreases, so lutein, carotene and anthocyanin will be displayed. For example, anthocyanin is very bright red and lutein is yellow, so the color of autumn leaves presents different colors in different shades of red and yellow, which is very beautiful. If we do an experiment, we cut a maple leaf in early autumn and put it in a dry place at home. After a few days, the water evaporates and the maple leaf.

Anthocyanins only appear red in acidic environment and blue in alkaline environment. If the leaves themselves do not contain acid, they will not turn red. According to the determination, only the cell leaves of a few plants such as maple and cotinus coggygria are acidic, and these trees will gradually change from green to red with the increase of anthocyanins in autumn. For most plants, anthocyanins are rare, or cell leaves are alkaline, so the leaves of these plants will not be affected by.

Just entering September, when most parts of China are still in the late summer, the leaves of the Northeast Plain and Changbai Mountain have turned red. With the passage of time, the temperature gradually decreased, most parts of China began to enter autumn, and the growth of red leaves gradually moved south. By 165438+ 10 and 65438+February, the leaves in the north have withered, and some areas in the south have already had red leaves.