In autumn, this poetic season always attracts people's attention with its unique charm. In this wonderful season, trees gradually change into golden autumn attire, leaves turn from green to yellow, and eventually fall off. When do trees start shedding leaves? This article will unveil the mystery for you.
The timing of tree leaves fallingAccording to China's climatic characteristics, trees generally start shedding leaves from September to November each year. The specific timing varies depending on factors such as region, species, and climate. Here are the falling times of some common trees:
1. Poplar: Generally starts shedding leaves in mid-September.
2. Willow: Usually starts shedding leaves from the end of September to early October.
3. Birch: The falling time is generally from mid-October to early November.
4. Zelkova: The falling time is roughly from the end of October to early November.
Reasons for tree leaves fallingTree leaves falling is a normal phenomenon in nature, and the reasons are multifaceted:
1. Climatic factors: As the temperature gradually decreases, trees reduce photosynthesis and slow down growth to conserve nutrients. Trees shed leaves to reduce water evaporation and lower water consumption.
2. Light factors: In autumn, the angle of sunlight decreases and the intensity weakens. Trees adapt to the change in light by shedding leaves to reduce the intensity of photosynthesis.
3. Nutrient distribution: As trees absorb nutrients from the soil during growth, they transfer most of the nutrients to the roots in autumn to store energy for the next year. The nutrient content in leaves gradually decreases, causing the leaves to turn yellow and eventually fall off.
4. Reproductive needs: Some trees, such as pine and cypress, reproduce in autumn. To ensure seed maturity, trees shed leaves to reduce water evaporation and ensure seeds germinate smoothly in a dry environment.
The significance of tree leaves fallingAlthough tree leaves falling bring certain inconveniences to people, it has the following important significance in nature:
1. Ecological balance: Tree leaves provide organic matter for the soil, which is beneficial for improving soil fertility and providing a food source for other organisms.
2. Water conservation: Leaves can reduce water evaporation, which is conducive to maintaining water sources.
3. Climate regulation: Tree leaves falling can lower surface temperature and regulate the climate.
Trees start shedding leaves from September to November, which is a normal phenomenon in nature. Understanding the reasons and significance of tree leaves falling helps us better protect the ecological environment and enjoy the beautiful autumn. In daily life, we should pay attention to the growth of trees and create a good growing environment for them to jointly maintain the ecological balance of our planet's home.