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Anonymous users2024-02-06According to incomplete statistics, there are 107 species of major alien weeds, 32 species of alien pests and 23 species of alien pathogens in ...... ChinaThe first list of invasive alien species was announced:
Purple stem Zeland, Mikania, hollow lotus grass,
ragweed, poison weed, Spartina alterniflora, airplane grass, phoenix eye.
Lotus (water hyacinth), false sorghum, cane flat moth, wetland.
Pine mealybug, mighty beetle, American white moth, African large.
Snails, snails, bullfrogs, ......
According to statistics, the United States is caused by the invasion of alien species every year.
The economic losses amounted to $150 billion to India.
The annual loss is $130 billion, South Africa is.
$80 billion. The economic losses caused by the invasion of alien species in China are also quite staggering, and the economic losses caused by only a few major invasive alien species amount to 57.4 billion yuan every year, of which 450 million yuan is needed for the annual control of the American spotted diver fly. What is the total amount of damage caused by biological invasions to our country?
Dr. Xie Yan of the China Council for International Cooperation on Environment and Development, which is responsible for investigating the status of China's invasive species, said: "It is estimated to be bigger than the United States. ”
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Anonymous users2024-02-05Good afternoon, the hazards of biological invasion are: 1. Biological invasion will seriously damage the diversity of organisms, some species will accelerate the extinction, and will also destroy the ecological balance, in addition, invasive alien organisms may carry some microorganisms to pose a threat to human health. In China, from south to north and from east to west, the troubles caused by these alien biological invaders can be seen almost everywhere.
China is one of the countries most affected by the invasion of alien species. 2. Invasive alien species are the number one enemy that threatens biodiversity, after the invasive species are introduced into other places, due to the lack of natural natural enemies and other constraints that can restrict their reproduction in their new environment, the consequence is that they spread rapidly, expand in large quantities, form dominant populations, and compete with local species for limited food resources and space resources, which directly leads to the degradation of local species, and even extinction. 3. Biological invasion will affect the water and other nutrients of plant soil, as well as the structural stability and genetic diversity of biological communities, thereby destroying the local ecological balance.
Environmental experts believe that in recent years, the invasion of alien organisms in China has been increasing, and the resulting biosecurity problems are becoming more and more serious, and it is urgent to effectively prevent the invasion of alien species. <>
I hope my answer can help you, and I wish you and your family good health, a happy life, and a happy life!
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Anonymous users2024-02-041. Biological invasion refers to the process in which organisms invade from the original habitat to another new environment through natural or man-made means, causing economic losses or ecological disasters to the biodiversity, agriculture, forestry, animal husbandry and fishery production and human health of the invaded area.
2. The harm of biological invasion: appropriate introduction will make alien species lacking natural enemies multiply rapidly, and rob the living space of other organisms, which will lead to ecological imbalance and the reduction and extinction of other native species, and seriously endanger the ecological security of a country. The introduction of species in this sense is referred to as "invasion of alien species".
Therefore, the alien species that cause serious harm to this reciprocal ecological environment are called "invasive species". "Invasive species" is different from "alien species", it specifically refers to harmful alien species, such as the aforementioned "water hyacinth", "pine wood nematode", "rice grass", etc., and its scope is smaller than that of "alien species"; "Alien species invasion" is also different from "alien species introduction", which specifically refers to the process of invasive species spreading from their native places to invasion sites through natural or man-made routes, and damaging the biodiversity and ecosystems of the invasion sites and even endangering human health, resulting in economic losses and survival disasters.
There are many relevant laws and related institutions related to the control of alien species in China, and these laws, regulations and organizational systems mainly focus on human health, pests and diseases and weed quarantine, and do not fully contain the relevant content of invasive species to biodiversity or ecological environment damage, and the goal of controlling alien species from the perspective of biodiversity conservation is still far away. At the same time, China has a vast territory and complex ecosystem types, and the transfer of species across regions in China has not received sufficient attention so far, and there are no rules and regulations to follow to manage the problem of regional species invasion. In fact, although China has taken some control measures for the introduction of the problem, it is far from establishing a complete set of invasive alien species control system, and has not paid sufficient attention to the early development, monitoring, early control and rapid response of invasive alien species. >>>More
According to a report by Guangming** (June 12, 2000), a "plant killer" Mikania produced in Central and South America is spreading rapidly on Neilingding Island in the southwest sea of Shenzhen. They are like a huge net, black and oppressive on the beautiful lychee trees, banana trees, and acacia trees. Trees are dying silently because they can't get sunlight, flowers and green grass are withering because they can't breathe fresh air, and the land on the island is turning into a wasteland. >>>More
In order to prevent the invasion of alien species, the first task is to defend, and the risk assessment system of alien species is to strive to resolutely keep out the more harmful organisms in the first area at the first time.
Illustrative methods are used: list numbers, give examples, make analogies, etc. >>>More
1. Overall logical order.
The first step is to define "biological invaders", which is a prerequisite for understanding things; Paragraph 2 excludes the "natural pathway migration" of ancient organisms, making the extension of the concept clearer. The second step is to explain the two major hazards of "biological invaders" - the huge economic losses caused to human society and the serious damage to the original ecosystem of a certain area, which is a natural extension of the derogatory term "invader". The third step is to deepen the understanding from the outside to the inside, from the things and people, from nature to society. >>>More