Some scholars abroad have calculated the ecological value of trees: the cumulative value of a 50-year-old tree is about196,000 USD.

Whether this calculation is accurate or not is obvious from the practical value of trees. A tree can produce 200 kilograms of pulp. If these pulps are to produce toilet paper, there must be at least 750 rolls100g of toilet paper.

In the city, a tree can store the pollutants emitted by a car driving for one year 16 km. Many trees can absorb harmful gases, such as 1 hectare Cryptomeria fortunei forest, and can absorb 60 kilograms of sulfur dioxide every day. Others, such as Ailanthus altissima, oleander, Ginkgo biloba, Sycamore, etc., all have the function of absorbing sulfur dioxide.

When the urban green area reaches more than 50%, the pollutants in the atmosphere can be effectively controlled. Urban forests can increase air humidity, and an adult tree can evaporate 400 kilograms of water a day, so the air humidity in forests is obviously increased.

According to calculation, the local summer temperature can be reduced by 0. 1% for every increase in urban green area. Urban forest belts and hedges can reduce noise.

A 30-meter-wide forest belt can reduce noise by 6-8 decibels. There are 3.5 bacteria per cubic meter of air in forest areas, while there are 34,000 densely populated cities lacking greening.

Urban streets with trees contain about 80% less bacteria than urban streets without trees. Urban shelterbelt can slow down the wind speed, and its effective range is less than 40 times of the tree height, and the best effect is in the range of 10~20 times, which can reduce the wind speed by 50%.

In farmland forest network, wind speed usually slows down by 30%~40%, relative humidity increases by 5%~ 15%, and soil water content increases by 10%~20%. According to the measurement, the canopy can intercept about 20% precipitation, which greatly weakens the influence of raindrops. As long as there is litter with a thickness of 1 cm on the surface, the surface runoff can be reduced to less than 1/4 of the bare land, and the sediment can be reduced to less than 7% of the bare land.

Compared with bare land, a hectare of woodland can store at least 3000 cubic meters more water. The storage capacity of 1 10,000 mu of forest is equivalent to a reservoir with storage capacity of 1 10,000 cubic meters, and the construction of such a reservoir requires an investment of more than10,000 million yuan.

Some experts predict that if forests are lost on the earth, about 4.5 million biological species will cease to exist, 90% of fresh water on land will flow into the sea in vain, and human beings will face serious water shortage. The loss of forests will increase the wind speed in many areas by 60%~80%, and hundreds of millions of people will be killed by wind disasters.

2. Who has environmental protection knowledge about trees?

Four benefits

1. Trees can regulate climate and keep ecological balance. Through photosynthesis, trees inhale carbon dioxide and exhale oxygen, making the air clean and fresh. An acre of forest releases enough oxygen for 65 people to breathe.

2. Trees can prevent wind and fix sand, keep water and soil, and absorb all kinds of dust. An acre of forest can absorb 20-60 tons of dust a year.

3. Forests can reduce noise pollution. A 40-meter-wide forest belt can reduce noise 10- 15 decibels.

The secretions of trees can kill bacteria. There are 34,000 bacteria per cubic meter of air in the open space, while there are only 3,400 bacteria in the forest.

Planting trees is the obligation of every citizen, and the state has designated March 12 as Arbor Day. Planting trees is of great benefit to our study, work and life.

Afforestation can purify the air, beautify the environment and green the motherland. It can also make oxygen in the carbon dioxide exhaled by people for people to absorb and breathe. If a large number of trees are not planted, the oxygen on the earth will be difficult to meet the needs of human beings and all kinds of creatures.

Afforestation can also reduce noise. Noise pollution has caused great harm to human life, study, work and rest, and can be said to be people's "enemy". Therefore, we should pay more attention to afforestation. Noise can also lead to hearing loss, deafness and stupidity, as well as heart, blood pressure and nerve abnormalities in long-term life. Even, it can make people die under long-term noise. In this way, afforestation can reduce noise by four or five times.

Afforestation not only has very important environmental benefits for human survival, but also has great economic benefits for human production and life.

The unreasonable exploitation and utilization of natural resources by human beings is the main reason for ecological imbalance. Deforestation, deforestation, overgrazing, etc. It will destroy forests and grasslands, cause soil erosion and land desertification, and make sandstorms occur frequently. Unreasonable development and occupation of land make the cultivated land area decrease day by day.

Afforestation plays an important role in maintaining ecological balance, with the functions of producing oxygen, purifying air, conserving water, conserving soil and water, regulating climate, preventing wind and fixing sand, and eliminating noise. Now that we know so many benefits of afforestation, we should consciously fulfill the obligation of afforestation and lay the foundation for creating our beautiful home.

3. There is an urgent need for environmental protection knowledge about trees

Reducing the felling of forest trees and sowing green is sowing hope. In learning, we should try our best to save stationery and put an end to waste. Pencils are made of wood, and wasting pencils is equivalent to destroying forests.

Take care of flowers and trees, do not destroy urban greening, and actively participate in greening and tree planting activities. The sharp decline of forests is an important part of the ecosystem on which human beings depend. There used to be 7.6 billion hectares of forest on the earth, but it has been reduced to 5.5 billion hectares in this century and to 2.8 billion hectares in 1976. Due to the growth of the world population, the demand for cultivated land, pasture and wood is increasing day by day, which leads to excessive deforestation and reclamation, causing unprecedented damage to forests. According to statistics, about120,000 hectares of forests disappear every year in the world, most of which are tropical rainforests that are crucial to the global ecological balance. The destruction of tropical rainforests mainly occurs in developing countries in tropical areas, especially in the Amazon region of Brazil. Amazon forest ranks first in the world's tropical rain forest, but by the early 1990s, the forest coverage in this area had decreased by 1 1%, equivalent to 700,000 square kilometers. On average, a forest the size of a football field disappears every five seconds. In addition, rainforests in the Asia-Pacific region and Africa are also being destroyed.

4. Who has knowledge about environmental protection of trees?

1. I believe everyone wants to spend their old age in a good living environment! If you want to create a good living environment for yourself and others, you should pay attention to the life around you.

Due to the poor environmental protection and sanitation in the world, these are manifested in the treatment of domestic garbage, which will bring environmental pollution to human beings. So I sincerely make the following suggestions: 1. Don't litter and spit. 2. Save paper: printing paper is used as draft paper; Print on the back of the printing paper.

3. Contribute to environmental protection: all kinds of flowers and trees. 4. Take care of your surroundings.

5. Turn off the water or power supply in time. I know that these small measures are not enough to represent my patriotism, so I decided to write more proposals for my motherland. I hope you can accept my opinion, and I hope more people will be patriotic.

From now on, start from me, don't litter, don't spit everywhere, and be a good example for young master. From now on, from me, wherever I go, I will not litter, spit, be a small guest and not be teased.

Let's take action, starting from me and starting now. In the new century, we are eager for a beautiful earth, a green home, a blue sky and fresh air.

However, due to human wanton destruction, pollution and waste, the earth has become riddled with holes. Mankind has been punished by nature and gradually realized the importance of environmental protection.

In my hometown of Luchuan, a Kyushu River runs through the county seat. According to the old man, in the past, the water in the Kyushu River was crystal clear, and hot springs kept pouring out from the beaches along the river, attracting tourists from all directions. In summer, people often go swimming in rivers.

Now, Kyushu River has become a "sewage river". The river is muddy and smelly. All kinds of garbage float on the river, and the number of hot springs is greatly reduced. It needs a pump to pump it up. People dare not swim in the river anymore.

Isn't this the result of people destroying the environment? We should learn lessons, protect the environment, clean the environment and beautify the environment, starting from me, starting from now, for the earth, for the future of mankind, and for us to have a beautiful living environment forever. I sincerely send you the following proposal: 1. * * * Let's build a "conservation-oriented society", saving a drop of water, saving electricity and saving a piece of paper. Save water, tighten the faucet in time after use, avoid opening it, and advocate washing hands and faces with washbasin; Save electricity, turn off the power supply when electrical appliances are not in use; Save paper, use handkerchiefs and rags, and try to use paper on both sides.

2. In order to reduce air pollution and save energy, try to use public transportation, bicycles or walking. 3. In order to protect natural resources such as forests and minerals, try to buy commodities made of renewable materials that can be used for many times and for a long time; Reduce the use of disposable paper cups, disposable wooden chopsticks and lunch boxes.

Reduce the use of plastic bags, which are the culprit of white pollution. Developing economy should not be at the expense of destroying the environment, but should be placed in the same position as protecting the environment.

6. Strengthen environmental publicity and education, cultivate environmental awareness from an early age, and actively participate in environmental protection activities. 7. Consciously protect the ecological environment and actively participate in greening and beautifying activities.

There is only one earth, and her life is fragile. We can't lack "degree" because of our rampant behavior, for the sake of immediate development and small interests, and make our already fragile body more fragile! Remember, protecting the earth means protecting ourselves! I care about campus environmental protection: I am willing to actively participate in school environmental protection activities and maintain the campus environment. Second, to achieve a balanced diet: I want a balanced diet, advocate drinking boiled water, and avoid eating packaged drinks and snacks.

Third, save water and electricity: I will save water and form a good habit of turning off the lights. Fourth, be a green consumer: I advocate green consumption, bring my own lunch tableware and reduce the use of disposable tableware.

Verb (abbreviation for verb) Shopping with your own shopping bag: I would like to shop with my own shopping bag and use less plastic bags or products that are over-packaged and difficult to recycle. Sixth, public transportation is good: I am willing to use public transportation.

Seven, * * pollution small ads: I am willing to * * spam ads, and will not post posters to advertise pollution. Eight, etiquette, environmental protection, quiet: I want to tell my parents to worship their ancestors on the first day of the New Year, use less paper bags and firecrackers, and don't make noise pollution.

9. Treat animals and plants with love: I will refuse to eat, buy or raise wild animals and plants and products, and care for flowers and trees. X. Green leisure is beautiful: I would like to advocate green leisure life and reduce the load of the natural environment.

Start from yourself, start from your side, please put your garbage into the sorting bucket in turn; Tree resources in China is extremely scarce. To protect tree resources, please reduce the use of disposable chopsticks. Please turn off the tap consciously when you leave the bathroom, and turn off the lights when you leave the room. Please put your used waste batteries into the nearest battery recycling box, and don't let them sleep in the soil; Protecting the environment is everyone's responsibility. Protecting the environment means protecting yourself. Do you love yourself? Although today's developed earth environment looks optimistic, there are very serious hidden dangers, which are all man-made: cutting down trees at will, setting up chemical plants, and discharging harmful liquids at will. "The annual emissions of gases that pose a greater threat to mankind in the world exceed 600 million tons ...; It is estimated that by the middle of the next century, one third of the earth's surface will be in danger of desertification, and 6 square kilometers of land will be desertification every year, threatening more than 60 countries ... "What do people think of these shocking figures? From 23 million years ago to the appearance of forest apes180 thousand years ago, and then to the highly developed civilization era of human beings, nature has always been "responsive" to everyone, which has further bred human greed.

For example, the Mulan River in China was originally a crystal clear river in the early 1950s, but now it has become a polluted river, and fish and shrimps have disappeared, adding another scar to our mother earth. Isn't this a wake-up call for mankind? Therefore, I solemnly suggest to those who haven't realized it: First, if human beings want to conquer the terrible nature, they must respect it.

We should be cautious in transforming nature, but we should also be bold, brave in practice and brave in improvement.

5. Green tips

Some scholars abroad have calculated the ecological value of trees: the cumulative value of a 50-year-old tree is about196,000 USD. Whether this calculation is accurate or not is obvious from the practical value of trees.

A tree can produce 200 kilograms of pulp. If these pulps are to produce toilet paper, there must be at least 750 rolls100g of toilet paper.

In the city, a tree can store the pollutants emitted by a car driving for one year 16 km. Many trees can absorb harmful gases, such as 1 hectare Cryptomeria fortunei forest, and can absorb 60 kilograms of sulfur dioxide every day. Others, such as Ailanthus altissima, oleander, Ginkgo biloba, Sycamore, etc., all have the function of absorbing sulfur dioxide. When the urban green area reaches more than 50%, the pollutants in the atmosphere can be effectively controlled.

Urban forests can increase air humidity, and an adult tree can evaporate 400 kilograms of water a day, so the air humidity in forests is obviously increased. According to calculation, the local summer temperature can be reduced by 0. 1% for every increase in urban green area.

Urban forest belts and hedges can reduce noise. A 30-meter-wide forest belt can reduce noise by 6-8 decibels.

There are 3.5 bacteria per cubic meter of air in forest areas, while there are 34,000 densely populated cities lacking greening. Urban streets with trees contain about 80% less bacteria than urban streets without trees.

Urban shelterbelt can slow down the wind speed, and its effective range is less than 40 times of the tree height, and the best effect is in the range of 10~20 times, which can reduce the wind speed by 50%.

In farmland forest network, wind speed usually slows down by 30%~40%, relative humidity increases by 5%~ 15%, and soil water content increases by 10%~20%. According to the measurement, the canopy can intercept about 20% precipitation, which greatly weakens the influence of raindrops. As long as there is litter with a thickness of 1 cm on the surface, the surface runoff can be reduced to less than 1/4 of the bare land, and the sediment can be reduced to less than 7% of the bare land.

Compared with bare land, a hectare of woodland can store at least 3000 cubic meters more water. The storage capacity of 1 10,000 mu of forest is equivalent to a reservoir with storage capacity of 1 10,000 cubic meters, and the construction of such a reservoir requires an investment of more than10,000 million yuan.

Some experts predict that if forests are lost on the earth, about 4.5 million biological species will cease to exist, 90% of fresh water on land will flow into the sea in vain, and human beings will face serious water shortage. The loss of forests has increased the wind speed in many areas by 60%~80%, and hundreds of millions of people will be killed by this wind disaster. ...

6. Information about environmentally friendly trees

Afforestation, returning farmland to forests and ecological reconstruction are extremely important. Harnessing desertified cultivated land, controlling soil erosion, preventing wind and fixing sand, and increasing soil water storage capacity can greatly improve the ecological environment and reduce the losses caused by floods. Moreover, with the economic forest entering maturity, the direct and indirect economic benefits are huge, which can provide a large number of labor.

Promote the sustainable development of local economy. The huge forest carbon sink will play an active role in protecting the global climate system and ecological environment.

Afforestation has many advantages.

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Automatic yarn trimming device

In summer, the temperature in the shade is about 10 degrees lower than that in the open space, and it is 2-3 degrees higher in winter.

Natural dust collector

There are many tiny hairs and mucus on the leaves, which can absorb harmful particles such as carbon and sulfide in the smoke and dust, as well as harmful substances such as germs and viruses, and can also greatly reduce and reduce the dust in the air. A hectare of lawn can absorb more than 30 tons of smoke and dust every year. Therefore, people call green plants "natural vacuum cleaners".

Oxygen factory

Leaves can absorb carbon dioxide from sunlight and make oxygen needed by human body. It is measured that one hectare of broad-leaved forest absorbs about one ton of carbon dioxide and releases 700 kilograms of oxygen every day. Therefore, people call green plants "oxygen factories".

Bacterial disinfection station

Trees such as pine, camphor and elm can secrete fungicides to kill mycobacterium tuberculosis and diphtheria.

Natural silencer

Greening can also absorb sound waves and reduce noise. In towns with concentrated population, rapid development of transportation, industrial and mining enterprises, noise is more and more harmful to human beings. According to the data, the noise is below 50 decibels, which has no effect on people. When the noise reaches 70 decibels, it will cause obvious harm to people. If the noise exceeds 90 decibels, people can't work for a long time. At present, in many cities in China, the noise in many environments exceeds 70 decibels. Therefore, noise, as a public hazard, has aroused widespread concern of mankind, and people have taken various measures to reduce noise, and greening and afforestation is a good way to achieve multiple goals.

From scientific experiments, it is known that the trees in the park can reduce the noise by 5-40 decibels, which is 5-25 decibels more than the natural attenuation in the open space at the same distance from the sound source; The car tweeter can reduce the noise 10- 15 decibels when it passes through the 40-meter-wide multi-level forest belt composed of lawns, shrubs and trees, which is more than 4 decibels more than the natural attenuation in the open space. Planting trees on urban streets can also reduce noise by 7- 10 decibels. Practice has proved that planting trees and flowers in urban streets, open spaces, houses and courtyards can reduce noise pollution.

Judging from the noise prevention effect of forest trees, the wider and denser the forest belt, the better. According to scientific research, in cities, there must be at least one forest belt with a width of 6m and a height of10m, and the noise reduction effect is obvious. Moreover, the forest belt should not be too far away from the sound source, generally between 6- 15 meters. In order to improve the perennial effect of greening and noise reduction, evergreen tree species should be selected as far as possible, mainly trees, and trees, shrubs and flowers should be combined to form a multi-level silent forest belt, which will have better effect.

How to protect trees

1. Apply lime at the bottom of the trunk near the ground about 1 m to prevent pests from climbing along the trunk and damaging trees;

2. Build nests in trees to attract birds to prevent pests;

3. In addition to man-made logging, fire damage to trees is also very great, and it takes a long time to recover itself;

I remember reading a book that it is best to mix tall trees and shrubs. Because shrubs are an excellent place for birds to live, if shrubs are cut down just for beauty, trees will be destroyed by insects as soon as birds leave.

7. Read the essay about caring for trees.

1. Use dots to explain the following meanings.

(1) Only with deep roots can it flourish. (From top to bottom, the longitudinal distance is large)

This cave is very deep. (From the outside to the inside, the lateral distance is large)

This kind of cloth is very dark. (strong color)

2. Sentence training.

if

Peel off the bark and the tree won't get food.

as soon as...

Will die.

if

Take exercise as dispensable, and your body can't get exercise.

You can't work and study better.

3. Write the sentences they see.

Exodus: When the trunk is broken, the tree will produce many side branches, which are neither beautiful nor useful.

If the body is decomposed, people will not have enough strength and spirit, neither can they live healthily and happily, nor can they better serve and contribute to society.

4. Find a phrase that can summarize the main content from the short passage and make a fuss on this basis.

If you plant trees, you should love them.

5. On the horizontal lines of the second, third, fourth and fifth paragraphs, add a central sentence that can summarize the content of this paragraph.

Water it often.

Don't shake.

Take care of Buck.

Protect the trunk.

6. Question and answer: Why do you say "trees are afraid of peeling"?

Because there are many small tubes conveying nutrients in bark, it is called "sieve tube". If the bark is stripped, the tree will die without nutrition. In addition, if the bark is broken, bacteria will invade the tree and the tree will get sick.

7. How can we guarantee to plant one or one new young tree?

Newly planted young trees should be watered frequently, not shaken, and the bark and trunk should be protected. In order to ensure that one species lives.

8. Little common sense of trees to human beings

Trees can adjust the climate, purify the air, prevent wind and reduce noise, and are the best friends of mankind. Trees are oxygen factories. One hectare of broad-leaved forest can absorb one ton of carbon dioxide and release 0.73 ton of oxygen in 1 day. Trees are dust filters. When the airflow with large dust content passes through the forest, with the decrease of wind speed, the dust with large particles in the air will fall rapidly. In addition, the epidermis of some trees has fluff or can secrete oil. They can stick dust to the body, thus greatly reducing the dust content in the airflow through the forest. Trees are experts in sterilization. Many trees secrete fungicides during their growth, killing all kinds of germs brought by dust. According to the survey, there are 4 million bacteria in the air per cubic meter in department stores, 580,000 in boulevards and 100 in parks. There are only 55 forest areas. The difference between forest areas and department stores is over 70,000 times. Trees are natural reservoirs and natural air conditioners, so we are committed to greening and cultivating all kinds of green seedlings, excellent varieties of seedlings, all kinds of high-quality and beautiful bonsai, flowers and so on.