What is the reason why the forest is warm in winter and cool in summer?

1. In summer, the trees are densely covered with branches and leaves, so the sunlight can't shine directly under them. Some trees are gray or light-colored, and some have a layer of wax, which is beneficial to the reflection of light. Some plants have the function of reflecting infrared rays, and infrared rays have the strongest thermal effect. So it's cooler in the forest than outside in summer.

2. The temperature in the forest is higher than that outside the forest in winter and lower than that outside the forest in summer, which makes the annual variation of the temperature in the forest less than that outside the forest, and the temperature changes smoothly. Warm in winter and cool in summer is a remarkable feature of forest microclimate.

3. The daily and annual changes of forest temperature are similar. The highest temperature in the forest is lower than that outside the forest, and the lowest temperature is higher than that outside the forest. The daily temperature range is smaller than that outside the forest, and the temperature changes gently.

Extended data:

Forest is the "dispatcher" of nature, regulating the circulation of air and water in nature, affecting climate change, protecting soil from wind and rain, and reducing the harm caused by environmental pollution.

In addition, forests also have the function of regulating microclimate. According to the measurement, the temperature of forest land is 3℃-5℃ lower than that of non-forest land in high temperature summer. In the cold and windy winter, the forest can reduce the wind speed and increase the temperature, thus playing the role of warm in winter and cool in summer. In addition, the leaves of plants in the forest have transpiration, which can increase the humidity of the surrounding air.

Forests are also buffers to control global warming. Due to the recent extensive use of fossil fuels, forests have been reduced on a large scale, and the concentration of atmospheric carbon dioxide has increased rapidly, resulting in a "greenhouse effect" and a global warming trend.

The results show that the reduction of forest area accounts for about 30 %-50% of the total effect of all factors in the current increase of atmospheric carbon dioxide concentration.

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