中国农业大学
课程论文
（2006-2007学年秋季学期）
论文题目：The ecological harm of biological invasion and prevention countermeasures
课程名称： 动物生态学
任课教师： 李德文
班 级： 试验121
学 号： 1208160201
姓 名： 刘子墨
Introduction:down to earth Globalization brings not only the change of world political and economic pattern, but also changed the spatial pattern of biological distribution, lead to the redistribution of population, and the biological invasion has become a social and national governments, international global change issues of common concern by academic circles.Biological invasion, global change, and habitat loss are the three most difficult environment problem of the 21st century.This paper expounds the general situation of biological invasion, the definition, invasion pathways and process, bad on this, advances some methods and strategies to prevent biological invasion of governance.
Key words: biological invasion, ecological issue
1.Foreign biological invasion status
Invasive species from natural distribution area was introduced by human activities, intentionally or unintentionally, in the local natural or mi-natural ecological system formed the lf-renewal, to the local ecological system or the obvious damage or effects of landscape species.
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The invasive species growing ason, invasion of pasture, forest land and wasteland, quickly form a single advantage community, lead to the decline of original plant community.Invasive home in local, extension, and have an impact or phenomenon known as the process of biological invasion.It is related to economic and social development, affect human health, agricultural potential, the ecosystem balance, biodiversity conrvation, and with the development of global trade, opening to the outside world, global change and the change of land u pattern will be more and more rious.
Our country has been favored by exotic harmful biological hazards in the world.In recent years, with the increasing international exchanges of, has been difficult to accurately answer how many alien species introduced to our country, how many populations has be自动挡车怎么开
en established and harm.Since the 1980 s, with the invasive plants and animals harm is rampant, intensified prevention and control work in China.Pest of exotic pests were nematodes, pinus elliottii powder, fall webworm, rice water like armour and America spot hidden fly and alternanthera philoxeroides exotic harmful plants, water hyacinth, grass and purple stems ze LAN has adopted a ries of effective measures to prevent and control, and obtained the effect of different degree, but becau at prent the country against foreign invasion did not t specific kind of prevention, control and management regulations, in the prevention and control of the invasive species around the lack of necessary technical guidance and unified coordination, although invested a lot of power and money, but some control effect is not ideal.Has the invasive species continue to spread the damage of the incoming new dangerous invasive species appear constantly and a potential threat.
英语四级复习资料1.1 Biological invasion caud rious economic loss
Biological invasion by governments to focus on the primary reason is that it is caud by t
he huge economic loss.Sawyer light shoulder star is native to Asia decay of wood destructive pests.With the development of international trade, the pest with the wood packaging material to enter the United States.In August 1998, it has been in California, Florida, New York, Washington commander 14 states such as warehou, found that in Chicago, New York and other places have also been found in the wild species.Star light shoulder sawyer, no predators, known in the United States will cau harm to the United States and the land planting maple trees and fruit trees.If it is in the United States has long reproduction, resulting in economic loss will be up to $138 billion.Only the economic loss caud by alien species invasion in the United States each year to $137 billion.amphibian
1.2 Biological invasion caud rious ecological damage and biological pollution
Most successful invasion of alien species after the explosion, the growth is difficult to control, cau rious biological pollution, causing irreversible damage to the ecosystem.Native to South America, for example, water hyacinth is now all over north Chi
na, east China, central China, south China's pool of lakes, the growing ason, rious damage to the structure and function of aquatic ecosystems, resulting in a large number of aquatic plants and animals died.More terrible is that many invasive species, gene mutation may ari in the new environment, cau rious biological pollution.
skim1.3 Biological invasion direct threat to human health and safety
开国元勋的元是什么意思Such as American outbreaks of cholera, 1991 is likely to be due to foreign ships of contaminated water dumping port in Peru.The cholera infected more than 100, ten thousand people, about 10000 people died;"Mad cow dia" found in the UK in 1986 at the earliest.Scientists speculate that may be the body of cattle or sheep dia been procesd into animal feed, that cau dia of mass communication.In March 1996, the British government official recognition of mad cow dia could infect people.
