Why does the "devil's flower" from Canada make people look like a big enemy?

　　■ Observer

　　Preventing the invasion of alien species requires the mobilization of the whole people, and the foundation must be based on the results of scientific research. There is a long way to go.

　　Recently, the Canadian "Sweet Goldenrod" known as the "devil's flower" has been discovered in many places in Wuhan, Hubei. Wuhan requires that the city's ground prevention mission be completed before November 20.

Immediately afterwards, "sweet goldenrod" was also found in many places in Henan, and relevant departments required emergency prevention and control of it.

　　"Sweet goldenrod" makes people feel like a big enemy, because this invasive alien species has extremely vicious ability to invade.

Solidago is highly adaptable, drought-tolerant and barren-tolerant. It can grow in a variety of environments and has a long growth period. It is also more aggressive, not only competing for sunlight and fertilizers with surrounding plants, but also causing other plants. die.

At the same time, the fecundity of "Solidago goldenrod" is also super strong. One plant can form more than 20,000 seeds, with a survival rate of more than 80%.

Therefore, a concentrated encirclement and suppression of "Sweet Goldenrod" must be carried out.

　　"Solidago goldenrod" is native to North America and was introduced to my country as an ornamental plant in 1935.

Because it is similar to dandelion, the seeds can be spread with the wind. At the same time, the seeds and rhizomes can be spread by attaching to the wheels and the soles of shoes. As a result, it has spread and become evil grasses in the north and south of China.

　　However, "Solidago goldenrod" is only one kind of invasive species.

Data show that more than 660 invasive alien species have been discovered nationwide.

In addition to causing the decline of agricultural and forestry products, output value and quality, and increasing costs, invasive alien species also cause harm to China’s local biodiversity, including encroaching on the living space of local species, causing death and endangerment of local species, and may also harm human and animal health. And the economy and trade have a negative impact.

Therefore, to prevent and prevent invasive alien species, we need to have overall strategies and tactics, and find scientific and effective methods through research.

　　To prevent the invasion of alien species, legislation is the first step.

At present, there are more than ten laws, regulations and regulations concerning the invasion of alien organisms in our country, but the special and national "Regulations on Prevention and Control of Invasive Alien Organisms" and the "National Plan for Prevention and Control of Invasive Alien Organisms" have not yet been announced.

However, in January this year, five ministries and commissions including the Ministry of Agriculture and Rural Affairs have issued the "Work Plan for Further Strengthening the Prevention and Control of Invasion of Alien Species", requiring all localities to implement it.

　　In addition, the prevention of species invasion requires scientific demonstration and management of introduced species. Professionally, it is necessary to clarify what species can be introduced and what species may cause invasion in the future and should not be introduced.

This is a very complex and cutting-edge scientific problem, and scientists all over the world are also exploring it.

　　Researchers in the United States have proposed some models to assess the risks of introducing multiple species of fish into the Great Lakes region.

They established the evaluation model based on the life history characteristics of some organisms collected from the literature, such as the reproductive success rate and past invasions of other members of the genus.

In addition, they also decompose the biological invasion process into several stages to evaluate.

Through these models, when inspecting previous species invasions, the accuracy of predicting the success of the invasion reached 94%.

　　Obviously, preventing the invasion of alien species requires sound laws and regulations and national mobilization, and the foundation must be based on the results of scientific research. Therefore, there is a long way to go.

　　□ Zhang Tiankan (Columnist)