The basis of color change in winter cold weather

Basis: In winter, the green pigment gradually fades, and the red pigment and yellow pigment are exposed. All leaves contain green chlorophyll. Trees use chlorophyll to capture light energy and store it in the form of chemicals such as sugar with the help of other substances in leaves.

Besides chlorophyll, many leaves also contain other pigments, such as yellow, orange and red. Although these pigments can't carry out photosynthesis like chlorophyll, some of them can transfer the captured light energy to chlorophyll.

In spring and summer, the content of chlorophyll in leaves is much richer than other pigments, so the leaves show the green color of chlorophyll, while the colors of other pigments are invisible.

Winter is one of the four seasons. Traditionally, beginning of winter is the beginning of mid-winter in 24 solar terms. In winter, life is closed and everything enters a state of recuperation.

In winter, everything is collected. After beginning of winter, everything began to hide.

The division of four seasons embodies many characteristics such as climate and phenology. The division of four seasons is often based on the change of temperature, using the seasonal average temperature method proposed by modern scholar Zhang Bao _. According to the seasonal average temperature method, the four seasons are divided, and the average daily temperature for five consecutive days is equal to or lower than 10 degrees Celsius, which is regarded as entering winter.

In the middle of winter, the sun's spirit retreats to the yin, life closes, and everything begins to harvest. Autumn harvest and winter storage, everything is hidden in winter, and winter is the season to enjoy a bumper harvest and rest.

In many areas, winter means silence and desolation. When the cold current strikes, living things will reduce their life activities, many plants will shed leaves, animals will choose to hibernate, and some are called hibernation. Migratory birds will fly to warmer places for the winter.