1, photosynthesis, absorption of carbon dioxide, release of oxygen.
2, transpiration, regulating air humidity.
3. Fix the soil to prevent soil erosion.
4, barrier function, wind and sand prevention.
5. Increase greening and beautify the environment.
6. Appreciate the value of beauty and increase the artistic content.
7. Industrial value, wood products such as wood and woodcarving.
8, medicinal value, made into medicinal materials.
9. Trees can reduce noise pollution. A 40-meter-wide forest belt can reduce noise10-15db.
10, tree secretions can kill bacteria. There are 30,000 to 40,000 bacteria per cubic meter of air in the open space, and only 300 to 400 bacteria in the forest.
Extended data:
The tree kingdom can improve the quality of the environment on which human beings depend. The tree kingdom and green plants continue to carry out photosynthesis, consuming carbon dioxide and producing fresh oxygen; More than 60% of the oxygen in the air comes from trees and green plants on land, so people compare trees and green plants to "oxygen factories" and "fresh air treatment factories". There are many trees in the tree kingdom that can secrete fungicides to kill all kinds of germs in the air; It can also absorb toxic gases discharged in industrial production, intercept dust that pollutes the atmosphere, and eliminate noise pollution harmful to human beings.
In summer, people feel very different under the shade of trees and direct sunlight. People will feel cool in the shade of trees in summer. This is because the green leaves in the dense tree crown can block the sun and absorb the radiant heat of the sun, thus reducing the temperature in the small ring. Trees are like giant water pumps, constantly absorbing water from the soil into trees, and then diffusing most of the water absorbed by roots into the atmosphere in the form of water vapor through transpiration of leaves, thus improving and regulating the relative humidity in the air.
In addition, the tree kingdom can also play an important role in protecting the environment on which human beings depend. We know that strong wind will increase soil evaporation, reduce soil moisture and cause soil wind erosion. In severe cases, sandstorms can bury towns and farmland.
According to the statistics of 1984, 6 million hectares of land are buried by sand every year, and13 of the land in the world is in danger of desertification, calling on the international community to fight to stop desertification in some parts of the world. "If you want to live in a sandstorm, you must plant more trees." The effective ways to prevent wind and fix sand are to plant trees, set up shelterbelts, reduce the wind speed and stop the erosion and migration of sandstorms.
References:
Trees _ Baidu Encyclopedia