Where can I know the red leaf index of Xiangshan?

The red leaf index of Xiangshan can be seen on the website of Xiangshan. According to the influence of temperature on red leaves, the discoloration period of red leaves is calculated and released to the public through various media to guide citizens to choose the best time to watch red leaves.

The released red leaf index * * * is divided into five grades: 1 grade means it is very suitable for viewing red leaves, and all red leaves in Beijing basically enter the best viewing period; Level 2 means that it is more suitable for viewing red leaves in mountainous areas above 200 meters above sea level; Level 3 means it is suitable for viewing red leaves, and the viewing effect is better in mountainous areas above 400 meters above sea level; Grade 4 indicates that it is not suitable for viewing red leaves, and the discoloration rate of red leaves is low on cloudy days or sporadic rain; Level 5 means that it is not suitable for viewing red leaves, foggy or windy weather, and the mountain road is slippery.

The influence of temperature on red leaves is very important. Every autumn, the weather turns cold. When the temperature drops to a certain extent, the chlorophyll synthesis of leaves of Acer truncatum, Torch Tree and Octagonal Maple is blocked, their leaves begin to turn into bright colors such as red, yellow and orange. Due to seasonal changes, the red leaf index is a special seasonal index, which is only released in autumn and ends in winter.