Why do the leaves turn yellow in autumn? Will it snow in winter?

It's because of the change in the weather, and some places don't turn yellow, and it doesn't snow in the winter.

The reason why the leaves turn yellow in autumn is that the roots and stems of the trees no longer deliver nutrients and water to the leaves in autumn.

The reason why the leaves turn yellow in autumn is that in autumn, the roots and stems of the trees no longer deliver nutrients and water to the leaves, and will break down the chlorophyll in the leaves, and transport nutrients to the roots of the tree as nutrients for the winter. The leaves also contain lutein, lutein, etc., and the leaves have no chlorophyll and nutrients, so only chlorophyll and lutein are left, so the leaves will show a yellow or red state.

Reasons for falling leaves in autumn

The fall of leaves is generally divided into two situations, one is that the leaves are already dead. Plants, like animals, are born, old, sick and die, and the other is a man-made "accident", such as a passerby picking off a leaf. Dead leaves have no physiological function and have to fall to dust.

The other is caused by the environment, and there are also two reasons for this: man-made and natural. In short, man-made is something man-made, such as a factory next to a tree or a nuclear power plant accident.

Leaves will choose to "actively fall in the face of adversity" to protect themselves. Natural environmental reasons are the most common situation, and the temperature drops sharply in autumn and winter, so it is impossible to carry out physiological activities, so it is necessary to hibernate people.

As the temperature drops, the stems have thickened bark, the roots are buried under the soil, and the thin leaves are left to fight alone. The impending cold also made these leaves, which were originally born for photosynthesis, at a loss. The wide leaf surface receives more sunlight, but it is less resistant to cold weather and is at risk of frostbite when the temperature is below zero.

The drop in temperature and the decrease in precipitation have directly made the process of not simply absorbing water "worse". There are many stomata on the leaves, and the tree loses a lot of water as it breathes. The leaves had no choice but to abandon them.

In autumn, the leaves turn yellow because the trees feel the climate change from the autumn, which slows down the growth rate, and the chlorophyll in the leaves will be decomposed, leaving only chlorophyllin and lutein in the leaves, so the leaves will turn yellow in the fall. The substances produced by the decomposition of chlorophyll are transported from the leaves to the tree as nutrients for the winter. <

In autumn, the leaves turn yellow because the trees feel the climate change from the autumn, which slows down the growth rate, and the chlorophyll in the leaves will be decomposed, leaving only chlorophyllin and lutein in the leaves, so the leaves will turn yellow in the fall. The substances produced by the decomposition of chlorophyll are transported from the leaves to the tree as nutrients for the winter.

The reason why the leaves turn yellow in autumn is that the leaves are devoid of chlorophyll and nutrients, and only chlorophyll and lutein remain, so the leaves will appear yellow or red.

When autumn comes, the trees feel the change in climate from the autumn, so that their own large amount of chlorophyll covers the green chlorophyll, and people naturally see the leaves turn red or yellow. In autumn, deciduous trees stop growing and only need a small amount of nutrients to survive. Before the leaves fall, the trunk of the tree decomposes the chlorophyll, and the substances produced by the decomposition are transported from the leaves to the tree as nutrients for the winter.

When chlorophyll is decomposed, chlorophyllin is left in the leaves, so you can see the leaves turn from green to yellow. The leaves are green because of the 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 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. In addition to chlorophyll, many leaves contain other pigments such as yellow, orange and red.

Although these pigments do not photosynthesize like 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.

Causes of leaf loss:

Defoliation is an adaptation of plants to unfavorable growth conditions in the natural environment, which can greatly reduce the transpiration of water, so that the plants can survive the cold of winter and the dryness of summer without dying. In fact, this is also a helpless move, in order to fight the ice and snow cold, I have to make a move to give up the car to protect the handsome.

The reason why the leaves turn yellow in autumn is that in autumn, the chlorophyll in the leaves decreases, and the color of the leaves themselves is revealed. The leaves contain leaf green, lutein, carotene, etc., which change depending on the temperature, and in autumn the temperature decreases, the light is weak, and the tree grows slowly, and the leaves turn yellow.

The reason why the leaves turn yellow in autumn.

The leaves of most trees turn yellow and fall in autumn, because the chlorophyll in the leaves will slowly decrease in autumn, and the original color of the leaves will slowly be revealed. In the spring, the leaves will photosynthesize, resulting in a large amount of chlorophyll, and in the autumn, when the light weakens and the growth of the tree slows down, the carotene in the leaves will emerge.

In fact, yellow is the original hidden color of the leaves, the reason why it appears green is because the leaves contain a lot of chlorophyll, but in addition to chlorophyll, the leaves also contain red pigment, yellow pigment, etc., when the weather turns cool in autumn, the infusion stops working, and the nutrients in the leaves cannot be transmitted to the branches and trunks, so they will slowly precipitate to the leaves and turn yellow.

There are many trees whose leaves turn yellow in autumn, and the common ones are sycamores, ginkgo, pomegranates, and acacias. Generally speaking, the leaves of plants mainly contain leaf green, lutein and carotene, and these three pigments will change due to the change of temperature, so the leaves will also show different colors.