In view of the global problem of exotic plants, the international community has paid enough attention to it as a discipline. Botanists, entomologists, ecologists, economists and sociologists from all over the world have been exposed to this field since 1950, and the Scientific Committee on Environmental Issues (SCOPE) under the World Science Union has started the research plan of "Biological Invasion Ecology". In 10 years, this project has studied the spread and influence of exotic plants and animals. Blackwell Science Publishing House founded the international publication Diversity and Distribution with the theme of "Biological Invasion Biology", and Cromwell Science Publishing Company also launched the international publication Biological Invasion at 1999. The number of original papers published in American Science Weekly increased from several in 1995 to more than 80 in 2006. Facts show that China is one of the countries suffering the most from the invasion of exotic plants. Recently, statistics from the Ministry of Agriculture of China show that more than 400 exotic plants have invaded China. Among the most threatening 100 alien species in the world published by IUCN, China accounts for more than 50 species. The annual economic loss exceeds 57 billion RMB.
From the statistical data of various countries, invasive plants are still the main invasive species, and their number and influence are increasing. Due to the inevitability of global trade development, more exotic species will invade, and traffic, immigration, tourism and commodity trading are directly proportional to the number of exotic species. It is inevitable that species diffusion will accelerate in the future, which will make some species more numerous, while others will be reduced or even extinct. However, the overall impact may lead to serious damage or even loss of species diversity and genetic diversity on a global scale. Due to the "great adjustment" of species guided by human interests, how to maintain the earth's environment in the future and how this adjusted biosphere will affect human society all need serious research and thinking by natural science researchers and social managers in order to make our earth run healthily.
The research on plant invasion in China began in the middle of1990s. Although some progress has been made at present, it still stays in the general, qualitative and fuzzy observation stage, and there is still a gap with the international advanced level. In 2003, the State Environmental Protection Administration announced the first batch of alien invasive species 16 (9 species of plants), and established the "Management Office for Preventing the Invasion of Alien Forest Pests" of the State Forestry Administration, and published the Catalogue of Forest Dangerous Pests. However, these regulations are only limited to the control of agricultural weeds, pests and diseases, and there are no regulations or regulations for invasive plants to destroy the ecological environment. In the investigation in 20001-2003, half of the alien invasive species in China were terrestrial plants, followed by terrestrial and aquatic invertebrates and microorganisms, of which 49.3% were unintentionally introduced, 3. 1% were naturally diffused, and the rest were artificially introduced.
The invasion of alien creatures has affected almost all the ecosystems in China ―― forests, grasslands, waters, wetlands, farmland, urban areas and so on.
China is a big agricultural country, which is in the process of transforming from traditional agriculture to modern agriculture. Invasion of alien pests has become increasingly prominent in agricultural transformation and production, posing a serious threat to China's sustainable economic development and ecological security.
The harm of alien biological invasion has attracted great attention of China government. The Ministry of Science and Technology has organized and carried out research on topics including the "973 Plan", the "Eleventh Five-Year Plan" supporting plan "Prevention and Control Technology of Alien Invasive Species in Agriculture and Forestry" and the basic work special project of the Ministry of Science and Technology, and established nearly 20 national biological invasion working groups throughout the country. Major research projects have also been carried out in provinces seriously threatened by alien biological invasion.
The research on biological invasion in China has made a breakthrough in both theoretical understanding and prevention and control technology. Among them, the research results of Chinese scientists on the invasion mechanism and characteristics of Bemisia tabaci, Eupatorium adenophorum and Bursaphelenchus xylophilus are particularly outstanding. The scientists of the project team led by Wan found that there was "asymmetric mating interaction" between Bemisia tabaci B, which was listed as the most dangerous invasive organism in the world by IUCN, and the indigenous Bemisia tabaci. This mechanism promoted the growth of B-type Bemisia tabaci population, and at the same time inhibited the growth of indigenous Bemisia tabaci population, thus promoting the rapid invasion and expansion of B-type Bemisia tabaci and replacing the harmless indigenous Bemisia tabaci. The paper of this research achievement has been published in the authoritative journal Science.
In terms of biological invasion prevention and control technology, China has established four technical systems: early warning blocking system, emergency control system, blocking fire extinguishing system and sustainable comprehensive prevention and control system. In order to ensure the prevention and control of alien harmful species from the system, some experts suggest that the Law on the Management of Alien Pests should be formulated as soon as possible, and an expert committee should be set up to make suggestions for government departments, so as to prevent the invasion of alien harmful species in a timely and effective manner.