Changes of plants in autumn

Most plants shed their leaves in autumn. This is an adaptation of plants to spend the cold season. In late autumn or early winter, due to the temperature drop, the root absorption is weakened, and the water supply for plants is difficult, which affects the photosynthesis and transpiration of plants. At this point, the leaves enter a state of aging. On the one hand, the amount of auxin that inhibits leaf abscission is reduced, on the other hand, a large amount of abscisic acid that can make leaves abscission is formed.

So in autumn, with the cold weather, the leaves of plants gradually fall off. Deciduous leaves are a good adaptive phenomenon for plants to keep water and survive the winter safely.

In China, traditionally, "beginning of autumn" in the 24 solar terms is taken as the starting point of autumn. Entering autumn means that rainfall and humidity tend to decrease or decrease. In nature, the qi of Yin and Yang began to change, the yang gradually declined, the yin gradually emerged, the climate changed from hot to cold, and everything was born with cold and gradually declined.

According to modern meteorology, autumn in north temperate zone is from August 23rd to165438+1October 22nd. Autumn in the south temperate zone is from February 19 to May 2 1.