The latest reports of biological invaders and the precautions taken by our country in this regard

1. Establish a coordinated management organization for the old and the old

Specific to China, we should set up a unified and coordinated management agency including quarantine, environmental protection, ocean, agriculture, forestry, scientific research institutions and other departments. This agency should proceed from the national interest, rather than the sectoral interest, to carry out the prevention and control of alien species in a comprehensive and integrated manner.

Before the introduction of alien species, the agricultural or forestry or marine management departments should conduct introduction risk assessments in conjunction with scientific research institutions, the environmental protection departments should make environmental assessments, and then the quarantine departments should carry out strict port checks, and multi-party coordinated actions should jointly and efficiently carry out the prevention and control of alien species.

2. Improve the risk assessment system

In order to prevent the invasion of alien species, the first thing is to prevent the invasion of alien species, and the risk assessment and closure system of alien species is to strive to resolutely keep out the more harmful organisms in the first area at the first time.

Invasive species tend to have a strong ability to reproduce and spread, and usually take advantage of this characteristic to rapidly expand populations at low densities and establish new populations in new habitats.

1.The nature of the invasion site also creates conditions for biological invasions.

It is believed that habitats with relatively few native species (the environmental space in which an organism lives), arid environments, salt marshes and alpine habitats, sandy or uneven soil habitats, fragmented habitats, and riparian habitats are prone to invasion.

2.Environmental change is also an important factor in the invasion of alien organisms.

For example, the increase of carbon dioxide concentration delays the succession process of grassland community, which provides more opportunities for alien species to enter the community. Increased precipitation will enable alien species to invade arid and semi-arid areas, among other things.

2. Pathways of biological invasion.

The main ways of biological invasion are natural invasion and artificial introduction, and artificial introduction can also be divided into unintentional introduction and intentional introduction.

1.Natural invasion is the invasion of alien species caused by the natural migration of plant seeds, animal larvae, eggs or microorganisms through wind vectors, water flows, or by insects and birds.

2.Although the unintentional introduction is artificially introduced, there is no subjective intention to introduce it, but it is accompanied by import and export**, sea vessels or inbound tourism are inadvertently introduced.

3.Intentional introduction is the most important channel for the invasion of alien organisms, and countries around the world often consciously introduce excellent animal and plant varieties for the needs of developing agriculture, forestry and fisheries.

First, invasive alien species can severely damage biodiversity and accelerate species extinction.

Second, the invasion of alien species will seriously damage the ecological balance.

Third, invasive alien species pose a direct threat to the survival of other organisms and even to human health due to the pathogenic microorganisms they may carry.

Fourth, the introduction of alien species will also cause huge economic losses to the affected countries.

Method: Unintentional introduction, intentional introduction.

The current situation of biological invasion in China.

In recent years, the phenomenon of biological invasion in China has occurred from time to time in various places, and the proliferation of invasive species such as water hyacinth, rice grass, and man-eating pomfret is an indisputable fact. This project will put forward countermeasures against biological invasion on the basis of the current situation, causes, methods and impacts of biological invasion.

China has always been one of the countries that are deeply harmed by alien pests, and its vast territory and various climate types are vulnerable to invasive species. Most invasive species from all over the world are likely to find suitable habitats. At present, invasive species can be seen in almost all ecosystems in China, such as forests, farmland, waters, wetlands, grasslands, urban residential areas, etc.

In 2003, the State Environmental Protection Agency and the Chinese Academy of Sciences published the "List of the First Batch of Alien Species in China", which included 16 species of Eupatorium purpurea, microchamomile, hollow lotus, seed grass, ragweed, poison weed, flower protection rice grass, airplane grass, water hyacinth (water hyacinth), false sorghum, cane moth, wetland pine mealybug, strong beetle, American white moth, African giant snail, Fushou snail and bullfrog. In fact, there are hundreds of species that have been invaded, and some of them grow wildly under suitable ecological and climatic conditions, causing frequent outbreaks of ecological disasters. At present, there are many species that have caused great damage to China's ecological environment and biodiversity, and brought serious losses, such as cotton wilt wilt disease since the invasion of the United States, 270 104hm2 has occurred, and at least 10 104t of lint is lost every year; In 1994, the American spotted diver flew into Hainan and Guangdong, and has now spread to the whole country, with an area of more than 100 104 hm2, and the annual control cost is more than 41.5 billion yuan. Since it first appeared in Zhejiang in 2003, it has now spread to 11 cities; Pine nematodes have approached Huangshan and West Lake; The hazards of pine scale and wetland pine mealybug are still expanding. The damage of the garden pest cane flat moth is increasing year by year, and there is a trend of spreading to the whole country; Microchamomile has been affected in local areas; The harm of water hyacinth in Dianchi Lake in Yunnan, Zhejiang, Fujian and other places is still very serious; The damage of rice grass to local biodiversity in the southeast coastal area has not been effectively controlled.

In addition, China has also introduced a large number of crops, livestock, poultry and aquatic products from abroad, and these alien species have promoted the development of China's agriculture at the same time, but also made some local species face the gradual replacement of alien species. It is even in a state of endangerment and extinction. At present, about 10% of local livestock breeds in China are on the verge of the list, and about 3% are extinct

Look up the "butterfly effect", it's an example, just do it.

I believe that a biological invasion is when an alien organism comes to a new environment in a different way and causes a certain impact. Therefore, it shows that biological aliens do not always cause harm. For example, Australia introduced the shell lang.

It will disrupt the ecological balance and cause economic losses.