How to protect forests in third grade writing essay

1. How to write an essay on protecting forests and protecting the environment

Forests are the source of life. Without forests, we would have no home, no fire, and we would not be able to eat cooked food. If there were no forests, the breath we exhale would not be able to become oxygen, and we would die from lack of oxygen. So trees are essential in our lives. We can't live without trees.

Trees can absorb carbon dioxide and produce oxygen, allowing organisms to survive better. If trees are cut down indiscriminately, birds will have no home; if trees are cut down indiscriminately, ecological balance cannot be maintained, and this place will become desert. We need trees in our lives. Trees are resources that humans must have. It is okay to cut down trees reasonably. In order to express our apology for the trees, we set March 14 as Arbor Day.

There are many pests, so every animal has a natural enemy, and the pest also has its natural enemy, which is the woodpecker. If humans cut down trees indiscriminately, the woodpeckers will not be able to eat enough, and the birds will have no home. In order to prevent the trees from being eaten by pests, the trees can grow better and contribute to mankind. However, humans cut down trees indiscriminately and bring harm to the trees. There was once a story: There was a man who came to a large forest to chop down a tree with a cigarette in his mouth. When he was about to chop down, a woodpecker flew over and pecked his head. This shows that this man's mind There are insects. After reading this story, we should protect trees and not let humans destroy the environment. Some factories discharge some dirty water into the river for convenience, causing pollution to the mother river. Now our capital Beijing has more and more sandstorms. If the environment is not protected, our capital will become a desert.

Therefore, we must plant more trees so as not to cause harm to ourselves, and let us become good friends with trees. 2. Third-grade composition "What to do if a fire breaks out in the forest

We can often see some news about forest firefighting on the Internet and on TV: Fires often break out because of people going to the mountains to worship ancestors during the Qingming Festival. What happens in the forest? In fires, animals in the forest have been injured or even died; the renewal capacity of the forest has been reduced; the ecological environment has also been imbalanced, so I would like to appeal: Don't let forest fires happen again. Forests are the most important natural resources in the world. Once we lose our forests, our world will be doomed. Forests were once affectionately called the lungs of the earth. What are the lungs of the earth? To put it simply, it is equivalent to the lungs of our human body. Once bad things enter the lungs, the whole body will be bad, so the same goes for the forest. We must protect the forest so that we can survive. Our lives and Forests have a lot to do with it. For example, the wooden pencils, tables, and chairs we use are all made of wood that is transported back from the mountains and then processed. How can we humans live without these things? There are many precious resources in the forest, where there is a lot of fresh air. Once it is destroyed, the most beautiful place in the world will be destroyed. The forest is also the home of many animals, such as: rhinos, golden monkeys, Siberian tigers... some Animals are now on the verge of extinction, so preventing forest fires can also protect my country's rare animals. If the forest suffers from fire, the trees will be burned, which will cause some sandstorms. In many countries, how many people have lost their lives because of sandstorms? , think about who caused these! There are many trees in the forest. Once a fire breaks out, it is difficult to extinguish it, and then it will spread to the city, with disastrous consequences. Fire is originally a very scary thing, but if it happens in the forest, the scene will be even more serious. It is difficult to control. How many people lost their lives due to fires from 2013 to 2014, and how many villages were engulfed by fire "tiger". Think about it if we also lived in small villages near the edge of the forest, if we were to save some of our own small If a fire breaks out due to interests, then we are the ones who will be harmed. The fire is really terrible. It will come as soon as we say it, and it will become more and more fierce. By then, no matter how many firefighters we have, they will not be able to resist it. For ourselves, for Our homes must sound the alarm and don’t let forest fires happen again.

3. How to write a third-grade essay on environmental protection

1.

Sound the warning bell for environmental protection

The earth is our human being The homeland and the mother of mankind. We rely on it and explore it.

This blue planet is so beautiful, but we have to know: there is only one Earth!

Unfortunately, many people turn a blind eye to this simple and easy-to-understand truth and continue to do whatever they want, regardless of the safety of their home planet. Environmental scientist Qu Geping once said: "Only change can save the fate of mankind, and only change can enable our descendants to survive for generations to come." The "change" here refers to environmental protection. You are right, so today there are many people holding signs and shouting empty slogans on the streets, but they have not seen much action. Will the pollution get better in this way? No!

Look, the rivers in our cities are black and smelly; the long queues of cars emit a lot of exhaust gas; the vast green spaces have turned into "concrete forests"; and the crisp bird calls have disappeared. Without a trace. If this continues, China will continue to be short of water resources, the air will become increasingly turbid, and 10% of bird species will disappear this century. We humans are the culprits for the above-mentioned things!

Everyone knows that trees can absorb carbon dioxide, emit oxygen, and purify the air, which are necessary conditions for our human survival. However, some people cut down trees indiscriminately for money, causing excessive water and soil erosion, causing serious damage to the vegetation on the earth, and desertification of oases and cities. Our human survival is threatened. The disposable chopsticks we usually use consume dozens of acres of forest every day. In the eyes of those people, trees seem to have no value except for being used as furniture and building materials.

2.

The afternoon before yesterday, I saw this scene on my way home from school.

A little boy wearing a black sportswear and carrying a brown schoolbag saw an older sister in front of him eating melon seeds while walking and throwing melon seed shells everywhere, so he walked forward and took the melon seeds. Smiling, she said to the elder sister: "Sister, you shouldn't throw the melon seed shells away. Everyone says, 'The city is my home, and it depends on everyone to keep the environment clean.' So we live in this world and we should protect our beautiful city." "But you..." "What are you doing? I can do whatever I want! You don't have to worry about it." The elder sister was so angry that her eyebrows almost became a straight line. The little boy then said: "Sister, in short, you are wrong, please pick up the melon seed shells!". "Humph"'s sister then pushed the little boy to the ground, turned around and walked forward. And what about the little boy? He slowly got up, picked up the melon seed shells that the sister had thrown away, and then threw them into the trash can on the roadside. Composition website home.sanwen8.cn

When I saw this, my heart was filled with anger. That big sister was so abominable that she treated children younger than her like this, and the little boy even suggested it. She is wrong, she should know her mistake and she should... Students, let's protect our city from now on! 4. An essay on protecting the forest

Give me back this forest

Zhang Shilin, Class 69, Grade 3

It turns out that I am a carefree, fast Happy little brown bear, I have many good friends to keep me company.

In the morning, egrets dance on the canopy, larks sing in the trees, deer forage for food and run on the grass, and little monkeys lazily jump on the trees to start morning exercises? Only the hard-working woodpecker doctor is giving Every tree works hard to treat the sick; the stream is crystal clear, and the fish play quietly in the water. The dense bushes are a good place for us to hide and seek, the green grass is a soft bed for our games, and the tall trees tower into the sky. ?, this is our beautiful home.

But now, humans have driven machinery into this forest and cut down it unscrupulously. Our homes have been destroyed, and the dense forests have turned into pieces of bare wasteland.

Due to the destruction of the natural environment, the scene of the past has been lost. The cutting down of trees has caused a lack of rain, the rivers have begun to dry up, the grass has begun to wither and turn yellow, and my friends, brothers and sisters have been scattered in various places.

Let us wake up mankind together! Please stop the machinery in your hands, don't destroy our beautiful home, and replace this forest with me. It is also your home, and it has a unique name called "Earth Village". 5. How to write a third-grade essay about creating a forest in primary school

Forest must be a word that gets a lot of questions.

Many writers said: "Forests can not only green the environment, but also prevent wind and sand, prevent soil erosion, absorb carbon dioxide, and reduce environmental pollution. People praise them as 'nature's beauticians' and 'special doctors' , 'timber manufacturing factory', 'green product warehouse', 'cheap and high-quality fertilizers and dyes'..." and other information show that the earth cannot be separated from forests, and people cannot be separated from forests.

However, have you ever calculated the forest we consume in a year? According to statistics, in order to meet the paper demand of our country's 1.3 billion population, our country must cut down half of the trees in Daxingling every year. But the amount of trees used in a year is far more than this. The amount of trees consumed by a fire is immeasurable: On a sunny day, a little girl went up to the mountain to play.

Suddenly, a spark appeared there. In an instant, the mountain was filled with fireworks roaring in the wind, making it impossible to distinguish between day and night. Neither the little girl nor the residents on the mountain could escape the grasp of the fire demon, so they perished.

What will the residents at the foot of the mountain think of first when they see the fire? "119"——Fire alarm! The firefighters learned that they rushed to the scene and fought hard to put out the fire... In the early morning of the next day, the originally lush place turned into a large piece of charred black. If no firefighters go to put out the fire that night, the fire will spread, and one, two, three... or even fifty or one hundred mountains will suffer.

How many trees are there in one hundred mountains? More importantly: How many innocent lives will be tragically lost? There is a saying: A big tree can make hundreds of millions of matches, but one match can destroy an entire forest. Protecting forests is everyone’s responsibility; preventing forest fires is everyone’s responsibility.

A little spark may cause huge losses to the people: life, wealth, family affection, the environment... Therefore, protecting the forest means protecting yourself; protecting the forest means protecting countless living beings; Protecting the forest is everyone's obligation; protecting the forest is doing a very, very good thing; protecting the forest is... If everyone protects the forest, then there will be no fires, and the world will be more beautiful and happy. 6. Essay on protecting the forest

It has been almost six months since Arbor Day, but planting trees and protecting the forest still attracts people's attention.

Since the 1950s, China has created a miracle of artificial reforestation in the world. According to statistics, from 1981 to 2002, more than 39.8 billion trees were planted nationwide on a voluntary basis. However, the speed and quantity of human destruction of forests are even more alarming. In the 10 years of the 1990s, the world's forest resources decreased by approximately 90,000 square kilometers, accounting for 2.4% of the world's total forest resources.

Destruction, land reclamation and indiscriminate deforestation have seriously damaged our country’s already small forest resources. Fires and insect pests also add to the damage to forests.

Sandstorm is a disastrous weather phenomenon caused by the interaction of wind and sand. Its formation is inextricably linked to factors such as forest decline, species extinction, and climate abnormalities. Among them, over-exploitation of nature caused by population expansion, excessive cutting of trees and over-cultivation of land are the main reasons for frequent sandstorms. It only takes a few seconds to cut down a big tree, but how many years does it take to grow into a towering tree?

For the sake of our home, please protect the forest. 7. How to write "I walked into the forest" in the second volume of the third grade essay

The big forest is a place I have always wanted to go to in my dreams. Today, I finally came to the forest I have always longed for.

I rode on a thousand-mile horse and came to a forest with lush green trees. Before I entered, my nose smelled a fragrant fragrance.

I got off the horse, carried food and water on my back and walked deep into the forest. As I walked, a big python suddenly jumped up to the treetops, opened its mouth and pounced on me. . I'm an expert at dealing with snakes, so I pinched it by about seven inches, swung it back, and continued walking forward.

Ah! Unexpectedly, there is such a beautiful scenery deep in the forest - birds singing in groups; cool springs gurgling; monkeys collecting herbs for injured tigers... It is really a paradise on earth! Seeing this, I couldn't help but think of the world outside the big forest. What a bloody scene it was! People killed each other, drove away the flocks of birds, and built their tall buildings.

The world is warming!

In a trance, a group of executioners who hunted animals rushed into the forest. The harmonious and peaceful paradise just now was filled with sorrow...

Thinking of this, I want to appeal to the whole world: protect Big forest! Let people and animals live in harmony and make the world a better place! 8. Composition on protecting the forest

1. The forest is a purifier of the air.

With the rapid development of industrial and mining enterprises and the sharp increase in the use of fossil fuels for human life, polluted air is mixed with a certain amount of harmful gases, threatening humans. Among them, sulfur dioxide is widely distributed and harmful. Harmful gases. All living things have the ability to absorb sulfur dioxide, but the absorption speed and ability are different.

Plants have huge leaf areas and can absorb sulfur dioxide much larger than other species. According to measurements, the sulfur dioxide in forest air is 15-50% less than in open land.

In the summer when there is high temperature and humidity, the forest absorbs sulfur dioxide at a faster rate due to the vigorous physiological activities of the forest trees. When the relative humidity is above 85%, the forest absorbs sulfur dioxide 5-10 times faster than when the relative humidity is 15%.

2. Forests have natural epidemic prevention effects. Trees can secrete highly lethal fungicides, which kill germs and microorganisms in the air and have certain health effects on humans.

Someone has measured the amount of bacteria in cubic meters of air in different environments: 1,000 in parks where people flow, 30,000 to 40,000 in busy streets, and only 55 in forest areas. indivual. In addition, the amount of fungicides secreted by trees is also considerable.

For example, one hectare of juniper trees can secrete 30 kilograms of fungicides every day, which can kill diphtheria, tuberculosis, dysentery and other germs. 3. Forests are natural oxygen plants.

Oxygen is the basic condition for human beings to maintain life. The human body must breathe oxygen and emit carbon dioxide every moment. A healthy person will not be fatal if he does not eat or drink for three or two days, but he will die if he is deprived of oxygen for a few minutes. This is common knowledge.

According to literature, to survive, a person needs to inhale 0.8 kilograms of oxygen and emit 0.9 kilograms of carbon dioxide every day. During the growth process, forests absorb large amounts of carbon dioxide and release oxygen.

According to research, for every 44 grams of carbon dioxide absorbed by trees, they can emit 32 grams of oxygen; the leaves of trees produce one gram of glucose through photosynthesis, which can consume 2,500 liters of all carbon dioxide contained in the air. . According to theoretical calculations, every cubic meter of wood grown in a forest can absorb about 850 kilograms of carbon dioxide from the atmosphere.

During the peak growth season, one hectare of broad-leaved forest can absorb one ton of carbon dioxide and produce 750 kilograms of oxygen every day. According to the information, 10 square meters of forest or 25 square meters of grassland can absorb all the carbon dioxide a person breathes out and supply the required oxygen.

It is true that trees also absorb oxygen and emit carbon dioxide at night. However, because the amount of carbon dioxide absorbed during the day is very large, almost 20 times that at night, the side effects at night are very small in comparison. Globally, forest green spaces process nearly 100 billion tons of carbon dioxide for humans every year, provide 60% of clean oxygen for the air, and absorb suspended particulate matter in the atmosphere. They have the ability to greatly improve air quality and reduce greenhouse gases. , reduce thermal effects.

4. Forests are natural mufflers. The harm of noise to human beings has become more and more serious with the development of AD and transportation industry, especially in cities and towns.

According to research results, when the noise is below 50 decibels, it has no impact on people; when the noise reaches 70 decibels, it will have obvious harm to people; if the noise exceeds 90 decibels, people will not be able to work for a long time. Forests act as natural mufflers and have a very good anti-noise effect.

According to experimental measurements, parks or forests can reduce noise by 5-40 decibels, which is 5-25 decibels more effective than natural attenuation in open spaces at the same distance from the sound source; car tweeters can reduce noise by 5-40 decibels when passing through a 40-meter-wide area. A multi-layered forest belt composed of lawns, shrubs and trees can reduce noise by 10-20 decibels, which is 4-8 decibels more than the natural attenuation effect of open land. Planting trees on city streets can also reduce noise by 7-10 decibels.

To achieve good noise reduction effects, in the city, there must be a forest belt of at least 6 meters wide (forest canopy) and 10 and a half meters high. The forest belt should not be too far away from the sound source. Generally, the forest belt should be 6-15 meters wide. A meter is suitable.

5. Forests have a regulating effect on climate.

The dense canopy of the forest can absorb, scatter, and reflect part of the solar radiation in summer, reducing ground heating. Although most of the forest leaves have withered in winter, the dense branches can still reduce the wind speed blowing across the ground, reduce the air flow, and play a role in thermal insulation and moisturizing.

According to measurements, the temperature in the forest in summer is 2-4°C lower than that in urban open space, the relative humidity is 15-25% higher, and the temperature is 10-20°C lower than the temperature of asphalt concrete pavement. Because the roots of forest trees penetrate deep into the ground, they continuously absorb water from the deep soil for transpiration of the trees, causing the forest to form fog normally and increase precipitation.

Through analysis and comparison, the annual precipitation in forested areas is 10-30% more than that in non-forested areas. According to foreign reports, in order for forests to play a protective role in the natural environment, their green coverage must account for more than 25% of the total area.

6. Forests change low air currents, prevent sandstorms, reduce floods, conserve water sources, and maintain soil and water. Due to the obstruction and friction consumption of forest trunks, branches and leaves, the wind speed will be significantly weakened when entering the forest area.

According to information, dense tree crowns in summer can reduce wind speed by up to 50%. The wind speed does not change much beyond 200 meters before entering the forest; after passing through the forest, it takes about 500-1000 meters to resume the speed before passing through the forest.

Human beings use this function of forests to afforestation and control desertification. The rotting layer of litter on the forest floor continues to increase, forming a thick layer of humus, which is like a huge sponge that absorbs rainwater. It has strong functions of absorbing water, delaying runoff, and weakening flood peaks.

In addition, the tree crown has a intercepting effect on rainwater, which can reduce the impact of rainwater on the ground and preserve water and soil. According to calculations, the forest canopy can resist 10-20% of precipitation, most of which evaporates into the atmosphere, and the rest falls to the ground or penetrates into the soil along the trunks to become groundwater, so a forest is a reservoir.

The root system of forest vegetation can firmly fix the soil, protect the land from rainwater erosion, prevent soil erosion, and prevent land desertification. 7. Forests can remove dust and filter sewage.

Industrial development and emissions of soot, dust, and waste gas seriously pollute the air and threaten human health. The wrinkles and hairs on the leaves of tall trees, as well as the sticky oil and juice secreted from the stomata, can capture a large amount of dust and have obvious blocking, filtering and adsorption effects.

According to data, each square meter of spruce can absorb 8.14 grams of dust per day, the pine forest can absorb 9.86 grams, and the elm forest can absorb 3.39 grams. Generally speaking, the concentration of flying dust in the atmosphere in forest areas is 10-25% lower than in non-forest areas.

In addition, forests are also very capable of purifying sewage. According to foreign studies, sewage passes through about 40 meters of forest land.