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The more the forest is really better?This big disaster 300 million years ago, the earth has told us the answer

The more the forest is really better?This big disaster 300 million years ago, the earth has told us the answer 最后更新:2024-02-28 20:22:35
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Unlimited expansion of forest area,Popular events maybe not a good thing?

Plants use carbon dioxide as "food". If the area of the forest is sufficient, it can solve the "greenhouse effect" caused by excessive carbon dioxide, and the air can make the air more fresh.It seems that there is no harm to humans.


But in fact, in the ancient history of the earth, it has happenedThe forest area is too large and eventually leads to "biostatic extinction".

How did this happen?How big should the area of the forest be reached the line of "great extinction"?


When does the forest appear

Scientists do not know where the first tree on the planet grew up, but now it is still basically judgedThe location and time of the first forest.

In 2017, Chinese paleontologists wrote in international academic journals and proposed aThe theory of trees grew up 70 million years ago.The theory is based on plant fossils unearthed in Tatsui, Xinjiang.

Those stones found in the ground were trees at least 370 million years ago. After changes in the vicissitudes of the sea, the dying trees were mineralized into stones.


(Tree fossils in the Tacheng area, 370 million years ago)

Except for our country, in my countryNew York, USAIn the region, a scientist has also discovered the fossils of treesEssenceAccording to the test,These trees were formed at least 385 million years ago.

The fossil trees at home and abroad were discovered, allowing scientists to form the earliest forest time,Dedicated between 390 million and 360 million yearsEssenceAccording to the geological period, this belongs to the earthMid -Pen Discipline mid -termEssence

Scientists believe that the gradual emergence of forests during this period and spread to various places eventually changed the structure of the earth's atmosphere.Prior to this, carbon dioxide concentration in the earth atmosphere was higher.Most animals are still living in the ocean, and some have four feet, and they can occasionally leave the sea ashore activities like the current amphibians.


With the emergence of forests, the atmosphere of the earth began to change, which directly affected the evolution of animals.Some animals began to leave sea water, moved in land for a long time, and eventually evolved into landlords.

How does the forest change the atmospheric structure of the earth

The inference of scientists now is that the plants that appeared at the time werefernHow did they affect and change the climate step by step?Scientists have proposed a theory.


At that time, the trees penetrated the ground deep underground and could break down the rock composition in the soil.In geology, this is called "weathering".

This process further caused a chain reaction, which caused carbon dioxide in the air to become carbonate ions in groundwater through transformation.These substances passed through the water and were eventually remitted into the sea.


(The painter imagines the forest of the Shi Charlene period)

As the content of carbon dioxide in the atmosphere decreases, the forest is continuously released oxygen, causing the oxygen content in the atmosphere to increase.The estimation of scientists is that more than 300 million years ago, the level of oxygen content in the atmosphere was about 35%.

The increase in oxygen content has also affected the evolution of animals.For example, at the time of insects, they were measured with current insects, they were all giant.Some giant dragonflies or other insects can reach 70 cm wide.


Giant dragonfly recovery model

Earlier scientists believed that it was because of the rise of oxygen content that the insects on the earth were huge.However, there are also theories that high oxygen levels are not the main causes of insect size.

At that time, some insects were large, but there were a large number of insects, and their body shape was basically the same as modern insects.


(Insect fossils in the coal seam)

More importantly, to the laterEnd of the DifielThe level of oxygen content on the earth fell at a level of about 15%. However, on the earth at the time, a large number of insects that can still be seen can still be seen.

This shows that the level of oxygen content in the atmosphere is not the only factor affecting the shape of the animal.While animals are evolved, the plants themselves are also evolving.And accidentally, he also made himself a small scale.


Charcoal Imagination Map

From prosperity to collapse

People know now,The coal on the earth is a plant body that has not been decomposed in ancient times., But the current plant will rot into slag after death. Why not the forest in ancient times?


This is mainly because,,,During a geological period, trees and even forests evolved too fast, so that the microorganisms that decomposed them had not yet appeared on the earth.

The geological period is about about350 million years agoCompared with the 390 million years ago, the earth has experienced more than 40 million years of evolution.


Now fern

After a long evolution, a new thing was produced in the cells of trees and other plants during this period-Wyin.You can simply understand it asPlants "bones"Because before there is no lignin, a large number of plants can only grow on the ground. After lignin, it can grow upright into trees.


The accumulation of lignin around the cells of the plant makes the plant itself hard, and it also helps plants to generate a pipeline of nutrients, which makes the body's body grow taller and higher.

The growth of plants needs to accept the sun to complete the photosynthesis. In order to win more sunlight, the body of various trees in the evolution is desperately increased.Some trees at that time could easily grow to a height of more than 30 meters or even 40 meters.

The higher the more you grow, the better you live. The low plants around you are blocked by the sun and lose photosynthesis.Then he was replaced by a large number of forests.In other words, from the early appearance of the trees to the later flourishing to the earth, it has evolved in the middle of at least 40 million years.


Ancient forest

Unfortunately, it will decline after Shengji.At that time, there were more and more trees, longer and higher, but participating in the decomposition microorganisms on the earth,Their evolution was overtaken by plants, and it was difficult to break down lignin in the tree.

In this way, the trees are desperately growing to absorb carbon dioxide. Even after some trees die, there is no way to break down.Those carbon (they are the predecessor of coal) are still locked in the body of the plants.


As a result, the carbon dioxide on the planet was sucked less and less,After more than 50 million years of evolution, the content of carbon dioxide on the earth's atmosphere finally reached a critical value.

As the carbon dioxide continues to decline, the greenhouse effect begins to weaken. In simple terms, it isThe carbon dioxide on the earth is getting thinner and thinner, and the heat that the sun is shining to the earth is not locked, and the overall temperature of the earth begins to decline.


Finally arrivedAt the end of the charcoal period,On the earthThe temperature is reduced to being covered by ice and snowEssenceA large number of forests disappeared before, and were always frozen underground.This process,Geological is called the crash of the charcoal and rain forest.

It is worth mentioning that this incident did not lead to the large -scale extinction of animals and plants, but just caused a small part of the species to disappear.The most affected is those fern trees with tall figures.


Tree fossil

The forest disappeared, and the content of carbon dioxide began to rise slowly.Especially after the microorganisms, after the microorganisms were gradually broken down, carbon returned to the atmosphere in the form of carbon dioxide gas, so the temperature of the earth began to rise slowly.

It's just that the previous species were replaced by new animals and plants.As for those trees that have not been decomposed, but have been buried deep in the ground, and after at least 300 million years of evolution, they have seen the sun in the form of coal.


After understanding this evolution, someone may exclaim: We can't grow trees now!

Will increase in forests make less carbon dioxide?

Some people may feel that in ancient times, because there were too many forests, it absorbed a large amount of carbon dioxide, which made the earth get cold.Now humans advocate large -scale breeding trees. Isn't this repeating the same mistakes?

This idea seems to be established, but in fact, the most critical point is that the carbon dioxide in ancient times is in a state of continuous consumption.On the earth, the content of carbon dioxide only increases.


Before the charcoal and rain forest collapsed, there were no large animals on the earth, and carbon dioxide was consumed by trees.Now on the earth,Each person keeps breathing 24 hours, and a carbon dioxide of about 40 grams is formed in an hour.

Every year in the world, the carbon dioxide that more than 7 billion people call out of 7 billion people will reach amazing.24.45 billion tons.If coupled with the carbon dioxide discharged from human industrial activities, the number of annual emissions has reached in 202136.3 billion tons.

While increasing carbon dioxide, the area of the forest continues to decrease.Since 1990, the area of forests around the world has decreased by 420 million hectares, accounting for 10%of the world's total forest area.


In the past 10 years, the process of decreased in the forest has been reduced in the past 10 years, butThe forest is still in a state of losses rather than growing.

So, there is no large number of forests to absorb carbon dioxide now. Too many forests will cause reduced carbon dioxide content?

in other words,Humans may not have seen that the day when there are too many forests that lead to a sharp decrease in carbon dioxide, first because the carbon dioxide content is too much, the greenhouse effect is intensified, and the destruction is under various extreme climate conditions.


Conclusion

Whether it is human activities or forest changes, this is a dynamic process.Similarly, the greenhouse effect that causes climate change on the earth is also a dynamic process.

The strong or weak of the greenhouse effect will cause the climate of the earth to become hot or cold. This change naturally depends on the activity level of humans and forests.

At present, human beings are proper gangsters, and various activities of human beings have caused carbon dioxide to increase.Because of this period, human beings should worry about the issue of strengthening the greenhouse effect.


Another point, we now talk about the evolution of ancient earth, it feels like a few words.It can be placed in a real environment, but it is a process of tens of millions or even hundreds of millions of years.The collapse of the rainforest of charcoal before, including the formation of coal, has changed hundreds of millions of years.

And how long we have appeared on this planet, especially the time when civilization has appeared. Compared with the evolutionary process of Earth, even Jiu Niu is not a hair.


That is,The various impacts of our active activities may be just the accumulation of climate change in the future, and we cannot see which change will happen in the future.Even when the real change has come, human beings have become extinct as a whole.

In this case, humans should consider climate change in the near future.The recent changes are that the forest is decreasing, and carbon dioxide is intensifying the greenhouse effect.


As for some people think that in the future, if there are too many trees on the earth, carbon dioxide will be absorbed in large quantities, which is the real worry.

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