What's the pollution on the grassland?

Waste paper, plastic bags, boxes, empty cans.

All words and deeds that don't care about the grassland will cause grassland pollution.

To build a factory on the grassland, in order to pursue high profits, untreated sewage is discharged, which is polluted by water; Discharge untreated waste gas and pollute the air; Discarding untreated waste residue will pollute the land.

People who travel to grassland say irresponsible things and throw rubbish at will, which also causes grassland pollution.

1. Ecological destruction and biological pollution: After the successful invasion of alien organisms, they multiply in large numbers and grow rapidly, which is difficult to control, resulting in the destruction of the ecological environment and the formation of biological pollution. In the 1960s and 1980s, in order to protect beaches, China introduced Spartina from Britain and America. After artificial planting and natural reproduction; It is distributed on the beaches of more than 80 counties and cities from Jinxi County in Liaoning Province in the north to Dianbai County in Guangdong Province in the south. In recent years, Spartina has spread seriously in some areas and is difficult to control. Destroyed the offshore biological environment, caused the death of a variety of organisms cultured in coastal areas, and blocked the waterway; Affect the exchange of seawater, lead to the decline of water quality and induce red tide; Competing with coastal beach plants for growth space led to the extinction of large mangroves. 2. Loss of biodiversity: If alien species have strong ability to survive and reproduce, they will suppress and crowd out local species, form dominant populations, and lead to loss of biodiversity. Nearly 1000% of the water surface of Dianchi Lake in Kunming, Yunnan Province is covered by water hyacinth. Before 1960s, there were 68 species of aquatic plants and 68 species of aquatic animals in Dianchi Lake. By the 1980s, most aquatic plants had been extinct, leaving only 30 species of aquatic animals. 3. Harm to agriculture and forestry: Many exotic organisms cause the death of crops and livestock, posing a great threat to agricultural and forestry production. The invasion of these exotic creatures only caused direct economic losses to agriculture and forestry, reaching 57.4 billion yuan every year. Every year, 6.5438+0.5 million hectares of forests are harmed by pests such as Bursaphelenchus xylophilus and Hyphantria cunea. Ragweed, Chrysanthemum morifolium, Erigeron breviscapus, etc. are flooding, causing great losses in agriculture; Rice weevil, African snail, liriomyza sativae and other harmful crops 1, 1 10,000 hectares. 1994 liriomyza sativae has invaded China with an area of100000 mu, and the annual control cost is 450 million yuan. 4. Threatening human health: The pollen of ragweed and porpoise trilobata is the main pathogen of human allergic symptoms-hay fever. If there are 40-50 ragweed pollen per cubic meter in the air, people will be infected with hay fever (autumn hay fever). Every year, 6 million people in the United States suffer from ragweed disease, and there are H million people in Canada. The First Affiliated Hospital of Jiangxi Medical College receives more than 2,000 cases of pollen allergy every year, nearly half of which are caused by ragweed pollen. Second, look at the current situation of prevention and control in China from the way of alien invasion. In recent years, the invasion of alien organisms has generally gone through three ways: first, it has evolved into an invasive species through artificial introduction, that is, conscious introduction; Second, with the introduction of trade, transportation, tourism and other activities, it was introduced unconsciously; The third is self-diffusion, that is, natural invasion. According to analysis, more than half of the alien invasive harmful species in China are caused by human factors. China's agriculture has entered an important period of development, the introduction and promotion of agricultural varieties have increased, species exchanges at home and abroad have become more frequent, and the possibility of biological invasion has also increased. Due to the lack of scientific and effective management system, risk assessment and analysis can not keep up, and it is difficult to avoid decision-making mistakes and blind introduction. Individuals or groups are driven by economic interests to illegally introduce alien species. Others have a weak ecological awareness, bringing in creatures from abroad at will and planting them at will. Therefore, the species of alien creatures are increasing, their distribution is wider, their introduction channels are complex, and they involve a wide range of units and individuals. Management is quite difficult, which has great hidden dangers to human and animal safety and poses a great threat to the ecological environment and biodiversity. Based on the above analysis, we believe that under the current trend of world integration and economic globalization, it is impossible to adopt a separate closure measure. Only by strengthening the supervision of species introduction, seeking advantages and avoiding disadvantages, and making beneficial contributions to China's modernization, is it a correct scientific move. In this regard, we put forward the following opinions. Three. Suggestions on strengthening supervision to deal with biological invasion 1. Strengthen legislation: China's current laws and regulations on animal and plant health and quarantine are formulated to prevent the invasion of exotic pests. They only quarantine known specific pests, such as agricultural law, forest law, seed law, fishery law, environmental protection law and other relevant laws and regulations, and they do not explicitly involve preventing the invasion of exotic animals. At present, there are no unified laws and regulations on the prevention and control of biological invasion in China, so the Law on the Prevention and Control of Alien Biological Invasion should be formulated as soon as possible. Z, strengthen publicity: the relevant propaganda departments should publicize the harm and preventive measures of alien biological invasion, and raise public awareness of prevention. Remind inbound passengers not to bring in creatures casually, let alone release exotic creatures into the natural environment. If it is really necessary to introduce alien creatures, the consent of the relevant departments must be obtained. Answer supplement

Killing Mikania micrantha in Guangzhou In a survey in September last year, plant experts suddenly found a plant called Mikania micrantha in Baiyun Mountain, Guangzhou, which surprised them: if it is not controlled, this plant will shrink or even die all the vegetation in the whole mountain within a few years, which has happened abroad and even at home. Mikania micrantha was immediately eradicated, and the Baiyun Mountain Administration attached great importance to this matter, and organized experts to search extensively on the mountain for many times, but no large-scale reproduction of Mikania micrantha was found.