Why do green leaves change color in autumn, and why do green leaves change color in autumn

Hello, the green leaves in autumn change color, it should be said that all leaves contain green chlorophyll, trees use chlorophyll to capture light energy and store light energy in the form of chemicals such as sugar with the help of other substances in the leaves. In addition to chlorophyll, many leaves contain other pigments such as yellow, orange and red. Although these pigments do not photosynthesize in the same way as chlorophyll, some of them are able to transfer captured light energy to chlorophyll.

In spring and summer, chlorophyll is much more abundant in the leaves than other pigments, so the leaves show the green color of chlorophyll, and the color of the other pigments is not visible.

When autumn arrives, the days are shortened and the nights are lengthened, which causes the trees to begin to lose their leaves. Before the leaves fall, trees no longer produce large amounts of chlorophyll as they do in spring and summer, and existing pigments, such as chlorophyll, gradually break down. In this way, as the chlorophyll content gradually decreases, the colors of other pigments will gradually appear on the leaf surface, so that the leaves will show yellow, red and other colors.

Why do the leaves change color every autumn? What are the factors that determine the discoloration of leaves?

Because there are four seasons.

Because it has to match everyone's mood.

You don't want to wear a padded jacket in winter.

Plants have life, can perceive the cycle of spring, summer, autumn and winter, spring and autumn, God's arrangement, the same 10 degrees, one is uphill, one is downhill, the same go to the middle of the slope, the feeling is different. The spring sprouts and spits green, which is the creation of nature and grows with Chang Sailing; The yellowing of the leaves in autumn is to accumulate strength, to overcome the cold winter, and to grow better in the coming year.

The world is magical, trees are no exception, in the spring, everything recovers, full of green, full of spring light, in the warm sunshine, the forest absorbs the rain and dew nutrients of the earth, and continues to thrive, from a small shoot, and finally grows into a towering tree. After the high temperature and strong sunlight in summer, the chlorophyll processing plant continuously absorbs carbon dioxide, exhales oxygen, and produces a large amount of sugar, which grows rapidly and robustly.

After the summer, in the autumn, the coniferous forests will not change color and continue to grow in the spring of the following year because of the waxy outer layer and the slow loss of energy and water in the winter. And which broad-leaved trees, the leaf surface has no wax protection, into the hail-resistant autumn, all the sugars produced by the leaves are stored by the trees, the sugars can lose energy, to ensure that the trees safely survive the chaos and cold of winter. If the trees do not shed their leaves and are still green, they need to breathe and waste a lot of energy, and the trees will not survive the winter safely.

In spring, the chlorophyll in the leaves gradually increases, and the leaves appear green. In autumn, the chlorophyll in the leaves decreases, lutein, lutein, and anthocyanins gradually increase, and the leaves appear yellow or red, which is a natural law. Spring is the germinal season, when everything recovers, grows, and multiples. This power comes from the nutritional accumulation of late autumn and early winter.

Autumn is the season of maturity and aging, and all things enter the period of maturity and aging, and this reality is the accumulation and transformation of nutrients in summer and early autumn. It has nothing to do with temperature, it has to do with the season. Why do the leaves turn yellow in autumn?

That's because after the tree has experienced the energy release from the spring budding to the summer leafy leaves, the nutrients and energy accumulated in the previous winter are depleted, and with the arrival of the bleak autumn, the leaves on the tree decay and turn yellow, gradually fall off, and continue to enter a dormant state to survive the long winter!

The reason for the discoloration of the leaves is related to the chemicals inside it – chlorophyll, carotenoids, anthocyanins, etc. It is also the result of the comprehensive effect of external temperature, temperature difference, light and other factors. In spring and summer, chlorophyll synthesis is greater than decomposition, and the leaves are green; Autumn is coming, the temperature drops, and the amount of chlorophyll synthesized is less than the amount of chlorophyll that is decomposed.

When its content decreases, other chemical pigments appear. If the ratio of carotenoids (lutein and carotene) is high, the leaves will appear yellow or orange; In late autumn, due to the low temperature, the ability of the leaves to transport sugar and water is weakened, and the concentration of glucose increases, and the increase in soluble sugars makes the cells acidic.

Under acidic conditions, anthocyanins turn red, as do leaves with a high proportion of anthocyanins. Of course, leaf discoloration is a complex process. When the cold air is strong, the temperature drops, causing low temperatures.

After that, the weather was sunny and the temperature difference was large. Such meteorological conditions promote the rapid conversion of chlorophyll into carotenoids and anthocyanins in the leaves. The external change is that the color of the leaves gradually changes from green to yellow, orange, red.

You should be familiar with chlorophyll, because almost all natural plant leaves contain chlorophyll. Through chlorophyll, the leaves absorb the energy needed by the sun and extract nutrients from water and carbon dioxide. Chlorophyll occupies a very important place in plants.

Chlorophyll is green and is the main chemical hidden in the leaves. In spring and summer, the color of the leaves is green.

With the arrival of autumn, the days become shorter and the plants photosynthesize less, so the leaves contain very little chlorophyll and will slowly change to other colors. Colors of many plants, fruits, vegetables, etc. All are related to anthocyanins, which are water-soluble natural pigments.

The color of anthocyanins is affected by a variety of factors, such as low temperature, lack of oxygen, etc., which will reduce the formation of anthocyanins. Anthocyanins can absorb green light, blue light, etc. In autumn, anthocyanins increase rapidly, showing more vibrant colors such as scarlet, purple, etc.

Because the proportions of the leaves are different, the color will also be different. In fact, there are many reasons for leaf discoloration, but the above three reasons are the main ones.

Leaf discoloration is also related to temperature, humidity, soil, pH, but light is important. Autumn is much less sunny than summer, so the leaves turn from green to yellow. As winter approaches, many changes take place in the plants.

Temperatures drop and daylight hours are shortened. The green tones of the leaves have disappeared, and other colors covered in chlorophyll can now be seen, replaced by the stunning splendor of autumn. Temperature can also affect the color of autumn leaves.

The higher the temperature, the brighter the color, and vice versa. Some trees shed their leaves, while others do not. In the north, winters are colder, forcing most tree species to lose their leaves, with a few exceptions.

Why do the leaves change color every autumn? What are the factors that determine the discoloration of leaves?

Poetry and clouds: frost leaves red in February flowers, it is to describe this phenomenon, the temperature in autumn and winter is lowered, the chlorophyll (showing green) in the leaves of plants is decomposed, lutein (yellow) and anthocyanins (red) are produced, so the evolution of plant leaves have a natural change of green to yellow or red.

There are four pigments in the leaves: chlorophyll a b, lutein, carotene, and the first two pigments break down in autumn, showing the color of the latter two pigments.

Leaves contain many pigments, including green chlorophyll, yellow carotene, and red anthocyanins. In spring and summer, the leaves contain the most chlorophyll, so the leaves are green. When the weather gets colder, the chlorophyll is destroyed and the stable carotene or anthocyanins are revealed, and the leaves turn yellow or red.

Why do the leaves change color every autumn? What are the factors that determine the discoloration of leaves?