The forest is a natural "sunshade" and a natural "humidifier". The protection and utilization of the forest will bring more benefits to human beings in spring. It is the right time to plant trees. Ten years to plant trees, a hundred years to enjoy the cool. Plant a sapling, and you can harvest a cool summer. So why do people feel cool when they are under trees or in the forest? First of all, the forest is a natural "sunshade". The leaves and branches of the forest canopy reduce the heat reaching the ground by reflecting and absorbing most of the solar radiation, so that the temperature inside the forest is significantly lower than that outside the forest. The canopy with different height and density has different weakening ability to solar radiation, resulting in different temperatures under the forest. The forest is also a natural "humidifier". The forest has strong transpiration. The high temperature promotes the plant roots to accelerate the absorption of soil water, which is transported to the leaves through ducts, and the water is lost to the atmosphere in the form of water vapor from the stomata of the leaves. Compared with the area without vegetation, the relative humidity in the area covered by vegetation can increase by 2.9% - 8.3%. During transpiration, the loss of water will absorb some energy and further reduce the temperature of the forest area. Under the dual functions of "sunshade" and "humidifier", forest vegetation regulates the temperature change in the forest by influencing solar radiation and transpiration. In fact, forest vegetation plays a role in regulating climate, ranging from a forest to the whole terrestrial ecosystem. It can not only regulate the temperature, but also affect the environmental humidity, precipitation and wind speed, and help maintain the climate suitability and stability. The climate in the area affected by forests is relatively complex. Forest vegetation mainly affects the climate by changing the surface water and energy balance. Generally speaking, large-scale afforestation will increase regional evapotranspiration, thus making the near-surface atmosphere more humid, enhancing the positive feedback between soil moisture, vegetation and precipitation, leading to stronger water vapor convergence and increased cloud cover, improving the precipitation recycling rate, strengthening the regional atmospheric water cycle, and playing a positive role in regional precipitation. Throughout the global climate change, glacier melting, sea level rise and extreme weather events caused by climate warming are increasingly prominent. The forest, which accounts for about 1/3 of the global land area, deserves to be the vanguard of the "climate protection war". The "sharp weapon" of forests to cope with climate change is their strong ability to capture and store atmospheric carbon. The forest absorbs light energy through photosynthesis, synthesizes carbon dioxide and water in the air into organic substances and "locks" them in the body, releasing oxygen to alleviate climate warming. At the same time, forest litter and root litter are decomposed by microorganisms, and carbon is transferred into soil storage, which can effectively slow down the process of climate warming. The climate regulation of forests is also closely related to our production and life. The farmland forest protection belt can adjust the farmland microclimate, reduce drought, dry and hot wind, typhoon and other disasters, improve the environmental humidity, provide suitable microclimate for crop growth, and is conducive to improving the grain yield. In addition, the humidification and cooling effect of forests can effectively alleviate the "heat island effect", providing planning ideas for the construction of livable park cities and green cities. Due to the unique forest landscape resources in many villages, rural tourism, forest health care and other projects continue to emerge
Edit：sishi Responsible editor：xingyong
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