As soon as Liu Ya talks about it, spring will come. What can the leaves say?

Leaves are falling and talking, and winter is coming.

The leaves of plants have a certain life span. Generally speaking, the life span of leaves is only a few months, and some can live for two to several years. Leaves will fall off naturally when they live for a certain period of time. This phenomenon is called defoliation. There are two kinds of deciduous woody plants: one is that the leaves only live for one growing season and all fall off in winter. This kind of plant is called deciduous plant, such as willow;

The other is that leaves can live for two to many years, mostly in spring and summer. After the new leaves appeared, the old leaves fell off for the last time. As far as the whole tree is concerned, it is evergreen all year round. This is called evergreen plants, such as conifers and cypresses. Defoliation can reduce water loss, and defoliation in late autumn or dry season can be regarded as an adaptation of plants to avoid excessive transpiration.

Extended information, such as the needle-like leaves of pine trees, also called pine needles, reduces the transpiration area, and the epidermis is thicker and the cuticle is developed. These structures can reduce transpiration and adapt to arid environment, so they are evergreen all the year round.

The leaves of Buxus buxus and other plants have a thick cuticle with wax on it, so it can also reduce transpiration and be evergreen all year round.

In winter, many trees will lose their leaves. This is because most of the water in trees is emitted through the leaves, but in winter, the weather turns cold, the climate is dry and there is little water. In order to prevent water loss, trees will lose their leaves. But some leaves are evergreen in winter. Most of them are needle-shaped leaves, and the water in the leaves is concentrated. Moreover, there is a layer of wax on the surface of their leaves, which makes it difficult to evaporate water. Therefore, they don't need to shed leaves in winter.