Swiss scientist: too much carbon dioxide does not help plants grow

Too much carbon dioxide does not promote the growth of trees. New discoveries by Swiss scientists have challenged the theory that increased CO2 concentration can promote tree growth.
Some people think that after the increase of carbon dioxide in the air, the important raw materials needed for plant photosynthesis are more abundant, which is more conducive to plant growth. When trees grow faster, they will also absorb large amounts of carbon dioxide from the air. However, the latest research data from Swiss scientists show that this theory may be wrong.
A few years ago, scientists created a forest environment in the forest near Basel, Switzerland, artificially increasing the carbon dioxide content. Through several years of continuous research data, the trees in the area did not grow faster than the trees in other areas.
The experimental team leader, Botanist Christian Koller, said that many academics and politicians tend to believe that with the increase in the concentration of carbon dioxide in the air, the future level of greening of the Earth will also increase, and now is the time for this theory Ask a challenge. The professor at the University of Basel, Switzerland, emphasized that the addition of carbon dioxide in the air will not bring any benefit to the human environment, except that it will cause the greenhouse effect. It is impossible to reduce excessive carbon dioxide in the atmosphere through the natural mechanism itself.
Corler introduced that the experiment was conducted in a forest of 500 square meters. Among them, dozens of mature deciduous trees have been planted. The experimental team has closed the area and injected pure carbon dioxide. Scientists sprayed 2 tons of CO2 collected from industrial waste every day during the tree growing season of 6 months per year. According to scientists, the carbon dioxide content in the region reached 530 ppm, which is 1.5 times normal.
In order to exclude other disturbing factors, the team was very careful about the choice of trees. They chose several tree species that were in the growing season, and the trees that were selected as experimental objects must have been undisturbed by human factors. . In addition, the researchers also carefully recorded the tree rings for reference.
Phytologist Yawendi Mahrie of the University of Oxford, UK, has studied the tropical rain forest for 25 years and believes that increasing carbon dioxide levels in the air can promote plant growth.
This time for the discovery of Swiss scientists, Maherli said that it is too early to draw an agreed conclusion and that similar experiments should be continued in the rainforest. Corler agrees with this approach: "This is the only way to know the effects of air changes on the Earth's flora."

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