What do you mean by stagnant dust?

What are the dust retention and soil consolidation of plants in question 1: 1? Plants put their roots into the soil and tightly connect with the topsoil, which inhibits the generation of dust. 2. The leaves of some plants have the function of absorbing dust.

Question 2: What does it mean to suck dust? Smoking means inhaling smoke (fine solid particles) into alveoli, which contains smoke tar. When it gathers to a certain amount, the fine particles become massive and adsorb on the walls of alveoli and primary and secondary bronchi.

Question 3: What is a tree species with strong dust retention ability? Ailanthus altissima, Populus alba, Photinia, Ginkgo biloba, Quercus acutissima, Pittosporum, Coral Tree, Pu Shu, Ulmus pumila, Platanus orientalis, Magnolia grandiflora, Zelkova schneideriana, Robinia pseudoacacia, Banyan, Holly, Osborne, Gleditsia sinensis, Cinnamomum camphora, Camphor Tree, Platanus acerifolia, Ligustrum lucidum, Sophora japonica, Cyclobalanopsis glauca, willow, etc.

Question 4: Five kinds of green plants with good dust retention effect, are there any plants that can purify smog? Guanyin: It can remove air and dust. African jasmine: It can relax people, help them sleep and improve work efficiency. White palm: It can inhibit the exhaust gas exhaled by human body and filter benzene, trichloroethylene and formaldehyde in the air. Silver Queen: The higher the concentration of pollutants in the air, the more it can exert its purification ability!

Question 5: A forest of 10000 square meters can retain dust about 686 times a week. A park has planted 40,000 square meters of trees, and this forest can keep dust in September.

Question 6: A suburban forest park has 124 hectares of forest. 1 hectare of forest can retain 32 tons of dust a year and absorb 85 tons of water from underground in one day. (1) This solution: (1) 124×32=3968 (tons) A: The forest in this park can retain about 3968 tons of dust a year. (2) 124× 85 = 10540 (.

Question 7: What does the dust retention ability of furniture mean? Wood in furniture materials belongs to porous organic materials, and its interior is full of ducts and cells. After the moisture of wood is lost in the drying process, a multi-cavity structure is formed inside.

Under this structure, sound waves can be absorbed in the cavity, so it has certain noise elimination ability.

The dust retention ability of furniture is not well understood, but should refer to the dust retention ability of furniture surface.

Question 8: I ask for your help. Using equation or equation to solve practical problems, it is known that the average dust retention of a ginkgo leaf in one year is greater than that of a Sophora japonica leaf in one year. A: Let's assume that the average dust retention of a Sophora japonica leaf in one year is xmg, and that of Ginkgo biloba leaves is ymg.

According to the meaning of the question, y=2x-4.

1000/y=550/x

Then x=22 y=40 can be calculated.

Therefore, the average annual dust retention of Sophora japonica leaves is 22 mg.

Question 9: l The benefits of green cities and the role of greening

People's living conditions are suitable, unsuitable and bad. People's survival and longevity are closely related to these conditions. By planting trees, planting flowers and grass, improving soil, improving water quality, ensuring fresh air and creating good environmental conditions, we can improve the physical quality of all the people and build a vibrant motherland.

Landscaping is an important part of urban construction. It has a close relationship with city people, and its function is various.

(A) beautify the environment

Landscaping is an important means to beautify the city. The beauty of a city, besides being good at using the topography, roads, rivers and buildings of the city to match the environment in urban planning, design and construction, can also reflect the beauty of the city flexibly and skillfully, and can also use the different shapes, colors, uses and styles of trees and flowers to configure colorful green spaces all year round. Trees, shrubs, flowers and turf are embedded in the buildings of cities and factories in layers. It not only makes the city wear green clothes, but also its magnificent colors are accompanied by fragrant flowers, dotted among trees, lush, which can play the role of finishing touch and icing on the cake, creating a beautiful, fresh and comfortable environment for the broad masses of people's work, study and life.

(2) Purify the air

Garden plants play a unique role in purifying air. They can absorb soot dust, harmful gases, carbon dioxide and release oxygen, all of which play a good role in purifying the air.

1. Dust in the air and dust flying out of factories are harmful substances that pollute the environment. Although the weight of these dust particles is very small, their total weight in the atmosphere is amazing. The average amount of dustfall per square kilometer in many industrial cities is about 500 tons, and some cities with very concentrated industries even reach 1000 tons or more. Every time a city burns 1 ton of coal, it will emit 1 1 kg of dust. In addition to coal dust, there are dusts produced by crushing industrial raw materials, including metal dust, mineral dust, plant dust and animal dust. Dust not only contains particles such as carbon and lead, but also sometimes contains pathogenic bacteria. When it enters the nasal cavity and trachea, it is easy to cause rhinitis, bronchitis, asthma and other diseases. Some dust enters the lungs, which will cause serious diseases such as silicosis and pneumonia. After planting trees, trees can greatly reduce the dust and dust in the air. The role of trees in absorbing and filtering dust is manifested in two aspects: on the one hand, because trees have dense branches and leaves, they have a powerful role in reducing wind speed, and with the decrease of wind speed, the large dust carried in the airflow decreases. On the other hand, because the leaves of some trees are rough and fluffy, they secrete viscous oil or juice, which can absorb a lot of dust and floating dust in the air. After being washed away by rain, dusty trees can restore their dust retention function. The total leaf area of trees is very large. According to statistics, the sum of forest leaf area is dozens of times of forest area. Therefore, it has a great ability to absorb trapped smoke and dust. According to the preliminary determination of general industrial areas in China, the concentration of floating dust in the air in green areas is less than that in non-green areas 10%-50%. It can be seen that trees are natural filters of air.

Lawn plants also have a good dust retention effect, because the leaf area of lawn plants is 22-28 times that of lawn. According to the test, the dust content over the football field with lawn is 2/3 to 5/6 less than that over the football field without lawn.

2. Absorbing toxic gases produced in industrial production, such as sulfur dioxide, is the main harmful gas produced by smelting enterprises, which is abundant, widely distributed and harmful. When the concentration of sulfur dioxide in the air reaches 0.00 1%, people will have difficulty breathing and cannot work for a long time; When it reaches 0.04%, people will die soon. Hydrogen fluoride is another highly toxic gas produced by kilns, phosphate fertilizer plants and glass factories, which is 20 times more harmful to human body than sulfur dioxide. Many trees can absorb harmful gases. For example, Cryptomeria fortunei 1 hectare can absorb 60 kilograms of sulfur dioxide every month. The sulfur absorption of some common greening plants in Shanghai was measured at 1975. It is found that Ailanthus altissima and oleander not only have strong resistance to sulfur dioxide, but also have strong absorption ability of sulfur dioxide. Under the condition of sulfur dioxide pollution, the sulfur content of Ailanthus altissima leaves can reach 29.8 times of normal sulfur content and 8 times of oleander. Others such as coral tree, Lagerstroemia indica, pomegranate, cinnamon, Magnolia grandiflora, palm, Elaeagnus Elaeagnus, Ginkgo biloba, Sabina vulgaris, Cephalotaxus grandiflora and so on. , also has strong resistance to sulfur dioxide, while Robinia pseudoacacia, Ligustrum lucidum, Paulownia, Platanus acerifolia, Buxus macrophylla and other tree species have strong resistance to fluorine. In addition, hibiscus, acacia, poplar, bauhinia, wisteria, Amorpha fruticosa and so on have strong resistance to chlorine and hydrogen chloride gas; Lagerstroemia indica can be absorbed ... >>

Question 10: What do the slogans in the green belt mean? It means to take care of the green belt and don't trample it at will.

The separated traffic of green belt has safety function. Green belts can beautify cities and eliminate drivers' visual fatigue. Planting arbor green belts can also change the spatial scale of roads and make the road space have a good width-height ratio. In addition, it also has the function of purifying the environment, which can retain dust, reduce noise, absorb harmful gases and release oxygen.