Benefits of greening

1, supplement the oxygen in the air. Adults need to consume 0.75 kg of oxygen and discharge 0.9 kg of carbon dioxide day and night. Many factories also emit carbon dioxide into the atmosphere. Oxygen in the atmosphere should be replenished in time, and carbon dioxide should be continuously removed to maintain the normal composition of the air.

Greening plants absorb carbon dioxide in the air and release oxygen in photosynthesis. Plants on the earth treat nearly 1000 billion tons of carbon dioxide for human beings every year. 60% of the oxygen in the air comes from forests and green spaces.

2. Absorb harmful gases in the atmosphere. Many plants have a strong ability to absorb and filter harmful gases in the atmosphere. For example, greening can effectively reduce nitrogen oxides in automobile exhaust, thus reducing the amount of ozone in the atmosphere and preventing the formation of photochemical smog.

3, dustproof. Some plants have leaves and stems covered with fluff, while others can secrete mucus or oil. Therefore, it can intercept, filter, adsorb or attach various suspended particles in the atmosphere. According to statistics, in the green area, the amount of particulate matter in the atmosphere is 50 ~ 70% less than that in the non-green area.

4, windproof. Greening is one of the effective measures to prevent wind, especially in dense forests. Because trunks, branches and leaves can block the airflow, the airflow will slow down after passing through the forest.

Its weakening degree is related to the height and number of trees, the types of trees and the width of forests. For example, when the airflow passes through the forest with the width of 120 ~ 240 meters, the wind speed can be reduced to almost zero, so afforestation has become an important windproof measure.

5. Noise reduction. Sound travels at a speed of 340m/s in the open area. When encountering obstacles from plants, it immediately changes from linear transmission to dispersed transmission, and the intensity becomes weak.

The measurement results show that moderate forest can reduce the noise intensity 10 ~ 13 dB, dense forest can reduce 18 ~ 20 dB, and ordinary street garden can also reduce the noise by 4 ~ 7 dB. So trees and plants can act as sound barriers and silencers. Planting more trees and shrubs on both sides of roads and around houses can effectively prevent noise pollution.

6. Sterilization. Many plants can not only secrete bacteria trapped in the air by mucus, but also release phytoncide with bactericidal effect, so planting more trees and flowers can reduce some airborne diseases.

7. Improve local microclimate. Plants can improve microclimate by blocking solar radiation and adjusting air temperature and temperature. The dense canopy can block the radiation of the sun, and at the same time, some sunlight can be absorbed and reflected by trees and other plants;

Therefore, the sunlight penetrating into the ground through the blade gap is obviously reduced, and generally only penetrates 5-40%. The solar radiation temperature in the green area is about 14% lower than that in the non-green area, thus reducing the degree of heat and severe sun exposure.

8. Various plants, especially trees, have the function of evaporating water. When the surface of green leaves evaporates water, it needs to absorb the heat in the air, so the temperature in the forest is 3 ~ 5℃ lower than that in the city. In winter, the branches and leaves in the green area absorb the heat of the sun and release it at night, so the temperature in the forest area in winter is 0.5 ~ 1℃ higher than that in the non-forest area. Greening has the regulation function of being warm in winter and cool in summer.

9. Plants, especially broad-leaved trees, can evaporate a lot of water every day and night during their growth. Generally, the atmospheric humidity in forest areas is 7 ~ 14% higher than that in non-forest areas.

10, clean water. Trees can absorb dissolved substances in water. Experiments show that after colored, odorous, turbid and bacterial sewage flows through the forest, the chromaticity of the water decreases, the odor weakens or disappears, the transparency increases and the bacterial content decreases obviously. Therefore, the environmental pollution caused by sewage is greatly reduced.

1 1, keep the ground dry. In swampy areas and areas with high groundwater level, the ground is usually very wet. The wet environment on the ground is not good for health. Trees have a strong ability to absorb groundwater and hidden water, so afforestation has become an effective measure to keep the ground dry.

Extended data:

To promote land greening, we must vigorously promote the traditional creative transformation and innovative development of the Chinese nation's love for trees, planting trees and protecting trees. The Chinese nation has always respected and loved nature, and the Chinese civilization that has lasted for more than 5,000 years has given birth to a rich ecological culture. In the long-term production and life, our ancestors formed a series of unique and effective environmental protection customs, such as strictly protecting trees in important ecological nodes such as water conservation areas and fields.

Clear sea water and lush mountains are priceless wealth. China believes that increasing forest coverage is one of China's "national independent contributions" to climate change. Paying equal attention to mitigation and adaptation, and further promoting large-scale land greening actions have become important measures for China to improve the environment and cope with climate change.

From "a pine tree" to the endless beautiful sea, Saihanba people have made unremitting efforts for a long time, changing the small environment with heavy wind and bitter cold in the past, making Saihanba a a solid ecological barrier in northern China. Moreover, China will continue to adhere to the principle of "benefiting the people, benefiting the people and serving the people" and launch a large-scale land greening campaign, and more "Saihanba" will appear.

For example, the protection of Sanjiangyuan National Park, Northeast Tiger and Leopard National Park, Giant Panda National Park and other national parks with large natural ecosystems as their main features, and the establishment of a nature reserve system with national parks as the main body will protect precious natural heritage for the Chinese nation and all mankind, which will effectively enhance China's ability to supply more high-quality ecological products.

Baidu encyclopedia-greening

People's Daily Online-Guangming Daily: Promoting land greening has continuously achieved tangible results.