The leaves of the tree turn yellow in winter, why do the leaves turn yellow and fall off in winter?

Place in a dark place, watering sparingly, watering sparingly.

The reason why the leaves are green.

It is because there is chlorophyll in the leaves. However, in addition to green pigment, the leaves also have many pigments such as yellow pigment, but the amount is very small. In autumn, as the temperature drops, the light becomes weaker, the chlorophyll synthesis is blocked, and the chlorophyll is unstable, and the light is easy to decompose, and the decomposed chlorophyll can not be supplemented.

Therefore, the proportion of chlorophyll in leaves decreases, while lutein is relatively stable and not easily affected by the outside world. As a result, the leaves show the yellow color of these pigments.

Plant mesophyll cells contain three main 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.

Specifically, all the trees of the maple family are of this type.

There are Acer truncatum, Acer pentagonalis, Sugar maple, Acer chalia, Acer occotics, Acer camphor leaves, Acer chinensis, Acer japonica, Acer fictitus, etc.

In addition, other tree species include:

Ginkgo biloba, torch tree, cog. cog. cog., cog. cog.

Yellow cypress tree, also known as: yellow kudzu tree, Latin name: ficus virens ait

var. sublanceolata (miq.) corner .

Nettle, Moraceae, and Ficus are deciduous or semi-deciduous trees [1], with thick stems, peculiar tree shapes, hanging roots and open claws, meandering and staggered, and full of antiquity. The leaves are dense and the leaves are green and shiny. The branches are dense, the large branches are stretched horizontally, and the small branches are obliquely curved.

The lifespan is very long, and large trees that are more than 100 years old abound. Referred to as the sacred Bodhi tree in Buddhist scriptures, in southwest China, the yellow cypress tree can only be planted in temples and public places, and is rarely planted in families.

In autumn, the green pigment slowly fades, and the red pigment and yellow pigment are revealed. All leaves contain green chlorophyll, which is used by trees to capture light energy and store it 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.

The leaves will turn yellow in autumn because the trees will stop growing in the fall, and the chlorophyll in the leaves will be broken down, leaving only yellow pigment or red pigment, so that the color of the leaves will change to yellow, and the trees will grow green leaves again after spring.

The green color of the leaves is due to the chlorophyll contained in the leaves, and the trees stop growing in the fall, and the leaves will decompose all the chlorophyll they contain before falling, leaving only the yellow or red pigment that cannot be decomposed, so that the color of the leaves will change to yellow or red.

When cultivating trees, it is necessary to prepare sharp scissors that have been disinfected, cut off all the wilted and yellowed branches and leaves of the plant, so as not to lose excess nutrients, and spray carbendazim or potassium permanganate solution to the fracture of the tree to disinfect and sterilize it to maintain the normal growth of the plant.

If you want the trees to survive the winter, you need to take warm measures for them, you can wrap cotton cloth or straw mats on the trunk of the plant to avoid frostbite of the tree, and use quicklime, sulfur powder and water to prepare a whitening agent, and then apply it to the trunk of the tree to avoid cracking the bark.

When breeding trees, it is necessary to apply fertilizer 2-3 times in the peak growth season of the plant, you can choose well-rotted organic fertilizer or nitrogen, phosphorus and potassium compound fertilizer, and dig a row ditch at the edge of the tree crown reflection, and then bury the fertilizer into the row ditch to promote the vigorous growth of trees.