Why can trees stop sandstorms?

Why can trees stop sandstorms? Trees can conserve water, improve surface vegetation, reduce land desertification, stop sandstorms and filter air.

Why can planting trees resist sandstorms? Planting trees and greening the motherland is a basic national policy of our country. Every spring, men, women and children carry out afforestation activities, covering our land with green vegetation and becoming a green land. First of all, afforestation can beautify the environment and eliminate air pollution. According to scientific statistics, one hectare of forest can absorb one ton of toxic gas carbon dioxide and release 750 kilograms of oxygen every day. According to experts' calculation, a person needs about 10 square meter of green area to ensure enough fresh air. The oxygen people need is that green plants absorb carbon dioxide in the air and release it through photosynthesis. According to calculation, an adult needs about 0.75 kg of oxygen and distributes 0.9 kg of carbon dioxide every day. Forests can absorb toxic gas sulfur dioxide; Sabina przewalskii can secrete bactericide, which can kill tuberculosis, typhoid fever, diphtheria, dysentery and other germs. Due to the continuous development of industry and mining, sulfur dioxide, nitrogen and hydrogen compounds and hydrocarbons in the air have increased greatly, which is very harmful to human health, while trees and flowers have a strong absorption effect on toxic gases in the air. The absorption of sulfur dioxide by forest is 5 10 times that of non-forest land. In a word, trees have the functions of sterilization, vacuuming and detoxification. Such as Ginkgo biloba, Betula platycladi, Elm, Platycladus orientalis, Pine and other trees, which can secrete strong aromatic volatile substances and have bactericidal effect, are called "phytoncide". Woods can shade the sun, cool down, adjust the climate and absorb sunlight. The summer temperature in the building area is lower than 8℃ 10℃. It can also reduce noise. The noise on the street without trees is five times higher than that on the street with lush trees. In this way, afforestation can not only beautify the environment and make the natural environment very pleasant, but also purify the air and ensure people's physical and mental health. Afforestation can reduce noise, maintain ecological balance, and provide an ideal place for human beings to study, work, travel, entertain and live, which is very beneficial to improving health. Secondly, afforestation can keep water and soil. In many areas of our country, due to low vegetation coverage, poor soil and water conservation and loose land, when the rainy season comes, a large amount of sediment is washed by rain and brought into the river, which makes the river turbid, silts up the river bed, causes siltation, and sometimes flash floods and river banks burst, causing incalculable losses to people's lives and property. Therefore, in order to control soil erosion, planting trees is necessary. Because the root system of the forest is as big as a crown. The roots of these trees extend in all directions, grasping the soil like giant hands. The water in the trapped soil is continuously absorbed and stored by the roots. In forest areas, 70% of precipitation seeps into the ground. Therefore, forests are called "green reservoirs". According to statistics, an acre of forest stores 20 tons more water than no forest area. This can conserve water and soil for afforestation. Afforestation can prevent wind and sand, and eradicate sandstorms. Sandstorm disasters are brave and powerful, whether by the sea or in the desert. Every time there is a strong wind, the sand flies with the wind. The stronger the wind, the greater the momentum of the sand. Wherever the wind and sand blow, fields are buried and towns and villages are in ruins. For example, in Dongdao, the sandstorm disaster in old China was serious, which flooded 12 villages and tens of thousands of acres of farmland, making people's lives miserable. After the founding of New China, under the leadership of Gu Wenchang, secretary of the county party committee, trees were planted and the roots of sandstorms were carved out, making it an "oasis in the East China Sea". In order to resist the attack of sandstorm, it is necessary to build shelterbelts to weaken the wind. Once the wind meets the shelter forest, the speed will be reduced by 70% to 80%. If multiple forest belts are arranged in parallel at a certain distance, the sand blown by wind energy will be greatly reduced, which will play a role in preventing wind and fixing sand. In addition, afforestation provides all kinds of useful goods for human beings. For example, in terms of eating, there are sweet fruits, nutritious tea oil, fragrant tea leaves and precious medicinal materials that nourish the body; In terms of use, rubber is an industrial raw material, wood can be used to build houses, bridges and railways, charcoal forests can be used as fuel, and wood can be used to make paper. In a word, wood is very useful and contributes to mankind. Forests can also protect wild birds and animals. If there are no trees in the world, it is something that everyone needs to protect. It is good for human beings, and it has many benefits for us, and its disadvantages are almost impossible to find. Throughout the ages, people have always been "overgrown with vegetation and rich in herbs". However, as you can imagine, people can't live without trees. If there were no trees in the world, what situation would we face? In life, even if everything is so perfect, if there is no green, life seems to be missing something, and you will never see the embellishment of life. Everyone likes nature, but without trees, it is like a vibrant painting. Without colorful colors, this painting is very monotonous. If there are no trees in the world, hateful tornadoes and sandstorms will take away our houses, damage beautified roads, cities and many other places, and bring people a lot of inconvenience. If there are "tree soldiers" to defend our home, those tornadoes can't destroy our lovely home at will. Trees are not only soldiers who guard their homes, but also good helpers who beautify the city and don't let the smog emitted by cars smell so bad! If there were no trees in the world, how monotonous the world would be and how sad Mother Nature would be!

Why can trees resist sandstorms? Two functions: First, a tree crown with a certain density can effectively block the progress of dust, just like filtering. In addition, the forest blocked the airflow near the ground and the dust settled. Secondly, trees themselves and their associated vegetation are effective means to fix water and soil, which can prevent desertification again.

Why is there a sandstorm in Shenyang and how to control it? Due to the long-term drought in northwest China, overgrazing grassland has deteriorated and desertification has intensified. Under the influence of the northwest monsoon, sandstorms have a tendency to spread to Shenyang, North China and other northeast regions.

Governance measures:

1. Plant plants suitable for desert arid areas, such as Hippophae rhamnoides, to form a ground cover plant layer, thus improving the ground cover environment, fixing soil, reducing wind speed, increasing air humidity and improving the microclimate environment.

2. Planting native low shrubs and small trees on the edge of desert to improve vegetation distribution.

3. Planting trees on a large scale to prevent soil erosion in areas affected by sandstorms.

4. Protect the environment in an all-round way and expand the afforestation area on the premise of ensuring basic farmland. The state implements compulsory afforestation laws and regulations, strengthens law enforcement and severely punishes deforestation.

Why is it a sandstorm? Why is it a sandstorm? First of all, why air? Air is a molecular particle formed by gaseous substances, but molecules also have gravity, so why did it run into space to form air? This is because the rotation of the earth makes the gravitational magnetic lines of force of the earth and the gravitational magnetic lines of force of the sun convection, which produces buoyancy and makes molecular particles run into space to form air. But at high latitude and low latitude, the linear speed of rotation is very different. The buoyancy produced by this convection is very different, which leads to the great difference in the formation conditions and air volume. This difference makes the latitude different and the height of the air different. In particular, air also has mass and inertia, so that under the influence of other factors, air will accumulate certain energy. Because the accumulated parameters are restricted by various factors, sometimes the accumulated energy will reach the energy of sandstorm. In other words, in order to balance the air at high and low latitudes, when the accumulated energy reaches the level of blowing dust, sandstorms will occur. If you are a student, the answers in the book and online shall prevail. What I said is just for discussion.

What trees can resist sandstorms? Sandstorm is caused by desert or semi-desert area, and controlling sandstorm means controlling desert. The difficulty of sand control is water shortage. Without water, plants can't grow, and the trees planted can't survive, even nothing grows. So the question first becomes: Why has the weather become so bad? In desert or semi-desert areas, is there always little rain and nothing grows? That's not true. According to historical records, many places in Inner Mongolia were rich in water plants and abundant in rainfall decades ago. Until recent decades, due to overgrazing, semi-desertification occurred and the climate became dry. Another example is the ancient country of Loulan, which used to be a prosperous country, but it no longer exists because of a large number of desertification and serious water shortage. It seems that lack of water is the main cause of desert formation. So the question boils down to: what is the relationship between climate drying and vegetation, and what is the relationship with forests? Did the desert appear because the vegetation was destroyed or because the desert destroyed all the vegetation? Now let's analyze these problems.

First of all, we should understand that in nature, no plant or animal will consume water in the process of water flowing back to the enclosure: almost 100% of the drinks and foods we drink or contain water are discharged from our bodies. Every grass and tree in nature, on the one hand, contains water, on the other hand, constantly absorbs and excretes water, so it will not consume any water. We say there is drought and little rain here. In fact, what we lack is only the water circulating in animals and plants, and the water in rivers, which seeps into the ground, is not used by us. This is the problem. Rich vegetation is easy to form moist air, and once it is cooled or combined with cloud and steam, it is easy to form rainfall, which is the water needed by vegetation. On the contrary, it is difficult to store water in desert areas-it either pours thousands of miles or seeps into the ground, so it can't evaporate evenly and form moist air continuously. Most of the air above it is very dry, and it is difficult to form effective rainfall even if wet clouds and steam pass through it. This is the main reason why rainfall is scarce once a desert is formed or vegetation is scarce. China belongs to the tropical climate of Southeast Asia. Even if typhoons can't bring rain, if water can circulate effectively between biospheres, we are not short of water. Someone has done such an experiment. In a completely sealed container, it is light-transmitting but can't penetrate any water vapor, and there are plants, air and necessary water inside, forming a biosphere. Plants live in this biosphere for a long time, and the water is always sufficient, and plants can get enough water, because the water needed by plants is the circulation of water, and it does not really consume water. From this point of view, surface vegetation needs available water. As long as it can be replenished in time or regularly, the ground is not short of water. In other words, even if the rainfall on the ground is less, it is not necessarily less in terms of the whole water cycle. As long as the ground and air are constantly adjusted, there will be no shortage of water. Drought and lack of rain usually refer only to the surface drought, which means that the water that plants can absorb is insufficient.

If so, what is the function of vegetation? What does the forest do? The usual saying is to conserve water, maintain soil and water, and adjust climate. Vegetation first plays a role in preventing wind, fixing sand and protecting the surface. As long as you observe it a little, you will find that when the rainstorm comes, the place with vegetation is often clear spring, and the vegetation obviously plays the role of sand fixation and filtration, while the place without vegetation is easy to form sediment and flood. Although sediment absorbs water, if there is no vegetation on the surface of sediment, it is easy to be washed away by water, resulting in soil erosion and flood disaster. When a large amount of sediment-laden water or debris flow flows into the river bed, it is easy to cause siltation and flooding. Judging from the situation in the Yangtze River basin, the flood caused by the flood level of 1998 meters and the loss of 1000 billion yuan are much smaller than the flood of 1955, but the harm is much greater and the water level is much lower, which cannot but show that this is the result of riverbed siltation.

Another function of vegetation is to regulate climate and increase rainfall. As pointed out earlier, no plant will consume water. Even though typhoons bring the same amount of water from the ocean every year, whether it rains or not is related to the ground temperature and air humidity. If the air humidity on the ground is high, it is easy to form rain once the temperature drops, but if the air humidity is low, it not only dilutes the humid air, but even if it rains, it may evaporate in the air before reaching the ground, so the rainfall is scarce. Only rich vegetation can discharge water evenly and continuously, keep the air moist, and thus play a role in regulating the climate.

In this case, water saving and air humidity are effective ways to solve the problem. Therefore, planting trees, building water conservancy projects and carrying out large-scale greening work are the primary problems to attract rainfall and prevent desertification. Generally speaking, however, the influence of forest vegetation on climate comes from the general environment. To do this, we need vegetation and tree planting in the whole region and even in China to play a role. In order to bring rainfall to arid and semi-arid areas, if vegetation and forests are developed nationwide, it will bring abundant rainfall. In other words, it is not enough to control sandstorms only by one household. Greening work must be carried out nationwide to promote precipitation in semi-arid and semi-desert areas and create conditions for greening in these areas.

The harm of sandstorm is holistic. Although sandstorm has its causes, its formation is also determined by the overall factors. Instead of struggling to find the origin, it is better to carry out tree planting and grass planting activities nationwide. Because even if we find the origin, drought, lack of rain, lack of water and huge area, there is still no way. Just as you know there are many deserts in China, what would it be? Therefore, carrying out greening and tree planting in an all-round way will play a huge supporting role in desertification control in arid and semi-arid areas, thus further realizing desert control and marching into the desert. In our country, many places threatened by desert are trying to prevent desertification, but trees often die because of lack of rain, which makes us consider the Great Green Wall behind us. Therefore, it is equally important to do a good job in greening in areas that are not threatened by desert.

Some people may ask: We plant trees to control desertification every year. Why are sandstorms increasing? This is because, on the whole, not only the situation of abandoned land, overgrazing and deforestation is still serious, but also there are many intangible damages, such as the damage to vegetation caused by road construction and urban expansion, so that the speed of artificial tree planting and vegetation can not keep up with the speed of logging and other damages, and the vegetation is gradually decreasing, which is also the root cause of sandstorms. Therefore, in addition to planting trees, cherishing green and protecting our forests, vegetation and pastures, it is the only correct choice.

Why are there sandstorms? Sandstorm refers to a serious sandstorm phenomenon in which strong winds blow a large amount of dust substances on the ground into the air, making the visibility less than 1km. Sandstorm refers to a sand-laden storm formed by strong winds blowing a large amount of sand near the stratum; Sandstorm is a storm formed by strong winds, which brings a lot of dust and other particles into the sky.

Causes of dust weather formation

First of all, we must understand the necessary conditions for the formation of sandstorms. These are dust sources, strong winds and unstable atmospheric stratification. It is easy to understand that strong wind is the driving force of sandstorm and the source of sandstorm is its material basis. In spring, cold air and cyclone activities are frequent, and the accompanying strong wind is the starting factor of sandstorm; Drought and lack of rain in spring is a major climate feature in northern China, and the continuous dry and warm climate has caused soil looseness, which has the material basis for sandstorms. Under the condition of partly cloudy clear sky and strong radiation from the sun, the near-surface gas layer is heated around noon, which is in a state of thermal instability, which is very beneficial to the development of air convection and the exchange of momentum and energy, and makes the dust particles in the atmosphere rise higher and spread faster. If the cold and warm air masses cross the front, the strong uplift near the front area can exchange energy and momentum, and the thermal uplift of the gas layer is easy to form strong sandstorm weather. Therefore, in spring, especially in the afternoon to evening in spring, sandstorms often form.

What is sandstorm, what is its harm and how to prevent it? Sandstorm is the general name of sandstorm and sandstorm.

It refers to a serious sandstorm weather phenomenon in which strong winds blow up and drag a large amount of sand and dust on the ground into the air, making the air particularly turbid and the horizontal visibility less than 100 meters.

Among them, sandstorm refers to a sand-laden storm formed by strong winds blowing a large number of sand near the ground; Sandstorm is a storm formed by strong winds, which brings a lot of dust and other particles into the sky.

Hazards: (1) strong wind, (2) sand burial, (3) soil wind erosion and (4) air pollution.

Prevention:

● Close the doors and windows in time, and seal the doors and windows with tape when necessary.

● Wear a mask when going out and cover your head with a scarf to avoid dust invading your eyes and respiratory tract. Special attention should be paid to traffic safety.

● Motor vehicles and non-motor vehicles should slow down, pay close attention to road conditions and drive carefully.

● Properly arrange outdoor items that are easily damaged by sandstorms.

● It is not advisable to go out when the sandstorm weather is strong, especially for the elderly, children and patients with respiratory allergic diseases.