Why do some leaves turn red in autumn?

Because there is chlorophyll in the leaves. However, in addition to green pigment, there are many pigments such as red pigment and yellow pigment in the leaves, but the amount is very small. In autumn, the green pigment slowly fades and the red pigment comes out.

I think it's a characteristic of many trees that lose their leaves in autumn, but it's very, very beautiful.

I think the leaves turn red in autumn because the leaves fall to the ground and slowly oxidize and turn red.

Because autumn has arrived. The turning of the leaves red is the least respect for autumn. It is also a symbol of autumn.

Because the leaves contain anthocyanins, this pigment is usually produced by the leaves in autumn.

There is glucose produced by photosynthesis in the leaves, and in autumn there is not enough sunlight, and the nutrients from the trunk are not transmitted to the leaves, so only glucose remains, and glucose makes the leaves red.

Some tree species produce large amounts of red anthocyanins from their leaves, and the leaves turn red. The ability of a leaf to produce anthocyanins is closely related to changes in the environment around it.

In autumn, when the weather gets cooler, chlorophyll is not easily produced. In this way, chlorophyll can easily be destroyed faster than it can be produced.

In the fall, some of the leaves become very depressed and then the leaves fall off one after another.

The varieties of trees are not the same. The needs of the maple leaf itself are different from those of other tree species.

In autumn, many trees lose their leaves, and the leaves tend to turn yellow before the leaves fall, but there are a few species whose leaves turn scarlet, called "red leaves".

We know that leaves contain a lot of pigments, such as chlorophyll, lutein, carotene, etc. Chlorophyll is darker in color, often covering other pigments in summer and showing a strong green color, but when autumn comes, the sun is still strong, the temperature is slowly decreasing, chlorophyll will gradually disappear because of destruction, then yellow lutein, carotene will be displayed, autumn leaves turn yellow is this reason. There are also plants under strong light, low temperature, and drought conditions, and the leaves will produce a large amount of red anthocyanins before they fall, which is the reason for the formation of red leaves.

According to statistics, there are about a few thousand species of trees whose leaves can turn red. The leaves of most plants generally only have a lifespan of a few months from birth to death.

In autumn, there are many tree species whose leaves turn red, such as persimmon trees, Nantian bamboo, black tree and so on.

The reason for this is mainly related to the natural pigments contained in the leaves. Generally, the pigments contained in leaves are lutein, chlorophyll, carotene, anthocyanins, etc. Chlorophyll is a substance that uses carbon dioxide and water to synthesize nutrients in the presence of sunlight.

The red color of the leaves is mainly anthocyanins, and the leaves turn red when they encounter acidic conditions. In autumn, due to light and temperature, the water in the leaves gradually loses, and the acidity in the leaves gradually becomes thicker, and the leaves turn red. This is the reason why some leaves turn red.

The reason why some leaves turn red in autumn is that the leaves contain a lot of pigments, such as chlorophyll, lutein, carotene, etc.

Chlorophyll is darker in color and often covers other pigments in summer, giving it a dark green color.

But when autumn comes, when the sun is still strong and the temperature slowly drops, the chlorophyll will gradually disappear due to destruction.

At this time, the yellow lutein and carotene are displayed, and this is the reason why the leaves turn yellow in autumn.

There are also plants that produce a large amount of red anthocyanins before the leaves fall under strong light, low temperature, and drought conditions, which is the reason for the formation of red leaves.

1. Maple tree: The maple leaves are brilliant in color and unique in shape, which can be used to make bookmarks, specimens, etc., and turn into fiery red in autumn. When it falls to the ground, it becomes crimson and repentant, and the maple tree belongs to the maple family of the maple family, which is the common name for some species of maple trees.

2. Coggy: It is an important ornamental red leaf tree species in China, the leaves turn red in autumn, bright and eye-catching, and the famous red leaves of Beijing Xiangshan are the tree species.

3. Black tree: Black tree is a color-leaved tree species, the leaf color in spring and autumn is red and dazzling, not less than the red maple. It is a unique economic tree species in China and has been cultivated for more than 1,400 years.

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.

Maple leaves, black tree leaves, and persimmon leaves turn red in autumn because plant mesophyll cells mainly contain three pigments: chlorophyll, lutein, and carotene, and the synthesis of these three pigments is related to temperature. When the temperature drops in autumn, the secretion of carotene increases, and carotene is orange, so the leaves turn yellow or red.

The shape of the leaves: 1. Oval: the shape is like an oval, the middle is the widest, the tip and base are round, such as the leaves of camphor tree, rubber tree, wood rhinoceros, tea tree, black jujube tree, and primrose;

2. Heart-shaped: shaped like a heart, the base is wide and round and slightly concave, and the apex is gradually pointed, such as the leaves of sweet potato, morning glory, bauhinia, and hemp. If the heart is inverted, it is called an inverted heart, like the leaflets of sorrel;

3. Palm-shaped: the leaves are three-lobed or five-lobed, forming deep notches, and the whole shape is like the palm of the hand, such as the leaves of cotton, castor, grape, maple and sycamore;

4. Fan-shaped: shaped like a folding fan, the top is wide and round, and gradually narrows towards the base, such as the leaves of ginkgo.