Why can forests adjust the temperature?

In summer, trees can carry out photosynthesis and transpiration faster, and can quickly release water into the air. The evaporation of water took away the heat and the forest became cold. In winter, photosynthesis and transpiration of trees slow down, so it is difficult to give off heat. Moreover, direct sunlight into the forest can also raise the temperature of the forest, so the forest will be warmer. Forests can not only adjust their own temperature, but also play the same role in the whole surrounding environment.

Other important functions:

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.

Forests are the lungs of the earth, and every tree is an oxygen generator and a carbon dioxide absorber. A linden tree can absorb 16 kg of carbon dioxide a day, and 150 hectares of broad-leaved forests such as poplar, willow and locust can produce 100 tons of oxygen a day. If urban residents own 10 square meters of trees or 25 square meters of grassland on average, their exhaled carbon dioxide will have a place to go and the oxygen they need will have a source. Will release 67 kilograms of carbon dioxide, enough for 65 adults to breathe.

Many trees can absorb harmful gases, such as camphor tree, oleander, clove, maple, Robinia pseudoacacia, Ailanthus altissima, Sabina chinensis, Ligustrum lucidum, oak, willow, hibiscus, elm, Pinus massoniana, Platanus acerifolia and so on.

Trees have a strong ability to absorb toxic and harmful gases such as sulfur dioxide, chlorine gas and hydrogen fluoride. These gases usually have 1/4, which can be purified or turned into oxygen when passing through the green belt.

Forest can conserve water and is a huge "reservoir", which plays an important role in the natural circulation of water. "Green mountains are always there, and green water is always flowing." Trees are always associated with water. Part of the precipitation rainwater is intercepted by the canopy, most of it falls into the litter under the tree and is stored in the loose and porous forest soil, some of it is absorbed by the roots of plants in the forest, and some of it returns to the atmosphere through evaporation. 1 hectare of forest can evaporate 8000 tons of water a year, which makes the air in the forest area moist, increases precipitation, and makes it warm in winter and cool in summer, thus playing a role in regulating climate. The leaves are like a big umbrella, which can prevent the rain from directly washing the ground; Both the moss on the tree and the litter under the tree can absorb some water.

Forests can prevent sandstorms and prevent soil erosion. As soon as the wind blows, it blocks the way with the crown of the tree, reducing the wind speed, and the roots are long and dense, so hold on to the soil to prevent the wind from blowing away. Heavy rain falls into the forest, seeps into the deep soil and rock crevices, and slowly flows out in the form of groundwater, which can't wash away the soil. According to the records of Kenya, Africa, when the rainfall was 500 mm in that year, the sediment loss of agricultural land was 100 times that of forest area, and that of pasture land was 3000 times that of forest area. Aren't we going to stop desertification and soil erosion? The most effective helper is the forest.

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.

If there is no forest, most of the life on land will be extinct, and most of the water will flow into the ocean; Oxygen in the atmosphere will decrease and carbon dioxide will increase; The temperature will rise obviously, and floods and droughts will occur frequently. Large-scale felling of forests, especially virgin forests, will undoubtedly affect and destroy the ecological function of forests, cause ecological imbalance and environmental deterioration in local and adjacent areas, and lead to frequent floods, intensified soil erosion, land desertification, river siltation and even enhanced global greenhouse effect.