Why are pines and cypresses evergreen all year round, and why are pines and cypresses evergreen?

Ordinary deciduous trees turn yellow and lose their leaves in autumn and winter because the leaves are large and there is no waxy film on the surface when the climate is not suitable (such as cold and dry), which causes water to disperse quickly and is not easy to survive. Pine, holly, cypress, etc., because the leaves are either pointed and thin, or have a waxy layer on the surface, and the water is not easy to lose, so they can still survive normally in harsh environments, so they will not lose their leaves and remain evergreen.

Because the leaves of pine and cypress trees are needle-shaped, and the structure of the outer layer of the leaves can prevent water loss to the greatest extent, they themselves have a very strong water storage capacity and broad-leaved plants in autumn and winter can not keep up with the water, so they need to drop the leaves to reduce the amount of water loss

Because the leaves of the pine and cypress can be kept on the tree for two years, when the new ones have grown, all you see is green.

You are so cute; It's because it doesn't drop leaves;

If you look closely at the evergreen trees, you will find that although they do not lose their leaves in autumn, the old leaves of these trees are constantly falling, but not all the leaves at once, but gradually falling leaves, and at the same time new leaves are constantly growing. So it gives the impression that the ground will not fall leaves.

Its leaves have a long lifespan!

Because you're a fool, you don't know it!

They are different from ordinary trees in that they have a long growth period, and it takes 2 to 3 years from germination to grow into leaves, while it takes longer for leaves to fall off. At the same time, when the pine and cypress lose their leaves, new leaves always grow. Therefore, we feel that the pines and cypresses are like evergreen in all seasons and never lose their leaves.

1. The reason why pine trees are evergreen is mainly because the leaves of pine trees are relatively small, and there is a layer of wax protective film on the leaves, which can protect the leaves, make the leaves not easy to lose water, and also make themselves lush all year round.

2. The pine tree is evergreen in all seasons mainly because of the unique shape of its leaves, which are generally reduced to needle-shaped, linear or scale-shaped, and due to the small leaf area, water is not easy to evaporate and dissipate.

3. Some leaves have thick or waxy skin, and some have very thick fluff, such as taking a pine needle and observing it carefully, you can see that there are dense white fluff on it, and it feels very smooth when touched, and these structures effectively prevent the evaporation of water.

4. When the temperature drops, it can quickly increase the concentration of fine residual fluid, increase sugar and fat in order to prevent freezing, so that even in winter, pine trees will not lack water and dry up, ensuring the vitality of the trees forever, the growth cycle of pine leaves is relatively long, generally 3 to 5 years, and the leaves fall from time to time, so you will see pine trees evergreen in all seasons.

Pinus tabuliformis, Pinus massoniana, Korean pine, cedar, etc.

Since these plants continue to grow many new green leaves each year, although a small number of leaves are shed, many leaves remain on the plant. On the whole, the plant body is still covered with green leaves, so it is called an evergreen plant.

1. The leaves of pine and cypress trees are generally shrunk to be needle-shaped, linear or scale-shaped, and due to the small leaf area, water is not easy to evaporate and dissipate.

2. The leaves of pine and cypress trees also have thick or waxy skin, and some have thick hairs, which effectively prevent the evaporation of water. At the same time, the leaves of pine and cypress trees have less water and contain pine resin, which can quickly increase the concentration of cell fluid when the temperature drops, and increase sugar and fat in order to prevent freezing. Therefore, even in winter, the pine and cypress trees do not dry out due to lack of water, ensuring the vitality of the trees.

3. In order to survive on their own, trees reduce nutrient consumption by falling leaves. It can be said that deciduous leaves are beneficial for plants. The leaves of pine and cypress trees do not fall off because they live in a cold environment for a long time, forming a unique structure to protect them from the cold.