What is our soil and "disease"
"International Herald" reporter Chen Juan Wu Xiaokang special writer Ji Fa is 50 years ago, 50 years ago in Beijing, Nanning, Changsha, especially corn production, is much higher than neighboring villages. Now, it has not been able to plant rice farm crops such as rice, and even the corn is difficult to harvest.
A villager in Dacunty Village, Jiangnan District, Nanning, Guangxi, said. Here is due to heavy metal pollution, not only the soil is destroyed, but the harvest of the field is sharply reduced, and many people are not willing to go home all the yearners.
Heavy metal contaminated this land inappropriate condition is not only forced farmers who have worked hard, which makes people’s body directly suffer from pollution pain.
Recently, the relevant departments also found that there were serious soil pollution in my country, such as cadmium, mercury, lead, arsenic in some areas in the middle and lower reaches of the Yangtze River. All of this is confirmed: people live in generations of lives are experiencing a catastrophe. So what is the situation in land pollution? How do we face the deep land that changed color but love? Where to find a cadmium? The radius of the hometown of Hunan fish rice is covered with a shadow of the cadmium exceeding the standard incident.
Today, regardless of the heavy metal content of rice, which district and counties come from the origin, as long as the relationship with Hunan, it will not be able to sell difficulties. Liu Xiangxi is the boss of the big plate of Datongqiao Town, Ji County.
Since its in March this year, he has been tested for cadmium exceeding the standard. Almost every night, it is more than 20 pounds in his 2 months in his 2 months.
Local FAO Yang Zijiang also dispelled a good idea to sell a few thousand pounds of rice to rice, I said to the boss, these valleys should help me first, sell it, give me money, sell I can’t make it.
Although rice factory bosses and farmers can’t figure out where to obtain grain grains, the official regions and area of ??soil pollution have not been unified, but the research of relevant agencies and experts still reveals the situation of the situation. According to the children of the Hunan Institute of Geological Research Institute, the study of 40,000 samples of the Dongting Lake District showed that the cadmium content of the soil layer of more than 15 cm or less is higher than 15 cm below 15 cm. .
The relevant departments of Hunan Province have been disclosed that one-quarter soil in the province has suffered heavy metal pollution.
According to statistics, Hunan Province has also become a province of the country’s soil acidification area in the country, with more than 35 million acidification in more than 35 million total cultivated land in the whole province.
The direct impact of soil acidification is to increase the activity of heavy metals in the soil, making it easier to be absorbed by crops.
The heavy metal pollution is in fact, not only in Hunan, and the rice produced in many provinces in China is detected by cadmium exceeding the standard, soil pollution has become the public hazard in my country.
Qian Guanlin, the Standing Committee of the National Committee of China, and the deputy director of the Population Resources Environment Committee recently stated that the soil pollution incidents were frequently issued, and it was one of the performance of my country’s environmental capacity to reach the critical point.
He pointed out that the soil pollution problems in the north, the Yangtze River Delta, and the old industrial base are generally in general, and there are particularly highlighted in some parts of the north, the Yangtze River Delta, and the old industrial base. The main pollutants of the soil are cadmium, nickel, arsenic, mercury, lead, chromium and other heavy metals and organic matter such as DDT, and some contaminants are more than a few times or even hundreds of times. His statement and the survey results of the National Multi-Target Region Geochemical Survey Project are basically consistent.
As an important result of the national survey of land resources and the special investigation of soil pollution status, the project has also discovered that the soil pollution in local areas has been discovered.
For example, there are universal cadmium, mercury, lead, arsenic in some areas in the middle and lower reaches of the Yangtze River. The city and its surroundings are generally mercury lead abnormalities, and some cities have obvious radioactive abnormalities. The lake is harmful element enrichment, and the soil is severely acidified.
For the latest situation of China’s soil pollution, the information disclosure of the official website of the authority department is still in July 2006. At that time, the relevant person in charge of the CPF revealed that it was not fully investigated. At present, the national contaminated cultivated land is about 100 million mu, with a total of approximately one tenth of the total cultivated land. The country has more than 12 million tons due to heavy metal pollution every year, and the direct economic losses have exceeded 20 billion yuan. Today, seven years have passed, cadmium rice wind wave, the large Jiangnan North, land heavy metal pollution is also said.
Therefore, in mid-June, when the Ministry of Land and Resources and the China Geological Survey have released the news of the human pollution map, people are happy and full of expectations.
This is the presence of a comprehensive consultation of soil weight metal pollution, which can clearly understand and grasp the pulse of land pollution conditions.
Sewage irrigation + fertilizer exceeds the standard, who is directly controversial, but the influence of the industrial three waste, abuse of agricultural input has become a general consensus.
Director of the Soil Fertilizer and Water Saving Agricultural Research Institute of Gansu Provincial Academy of Agricultural Sciences told the International Heavy Metallic Pollution in China. my country’s soil heavy metal pollution is mainly distributed in the sewage irrigation area and mining area, and concentrated on the source. On a large number of pesticide fertilizers.
For example, Dongdagou in Baiyin City, Gansu Province.
The heavy metal wastewater produced by Military Mining, Mining, Mining, Smelting, etc. It is discounted into the Yellow River through the urban Dongda ditch, and the suburban farmers are intercepted industrial sewage for agriccking, causing cadmium, arsenic, and arsenic, and arsenic. Heavy metals such as lead, mercury are severely exceeded. This is something more than ten years ago, that is, because heavy metals are not easily done after entering the soil.
He said. In addition, the predatory development of land has also increased the pace of heavy metals into the soil. In recent years, in the pursuit of production and economic benefits, farmers have a large number of nitrogen fertilizers and phosphate fertilizers, soil acidity soaring. Introduction to children, the total amount of cadmium, which enters the soil in the world, is about 55%, which is about 55% in the world. According to an expert in Hunan Province, due to the unreasonable cultivation, excessive planting and agricultural chemicals, it compared with the second soil census in the 1980s, the pH value of cultivated land in Hunan Province has dropped to 30 The degree of acidification of soil is equivalent to the extent of 300 years in natural state.
The harm of soil acidification is very huge, and the pH is 1 point, the active value of heavy metals will increase by 10 times.
In the past 30 years, the heavy metal activity value in the soil has increased by two or three times.
The above respondent pointed out.
At present, the average thickness of the rice field in Hunan Province is only about 13 cm, which is less than 8 cm of the pada cultivation of the individual rice fields than the second soil in the 1980s. Industry insiders pointed out that the soil is actually a living body, and now its health has been seriously over. At the same time, the sick soil will pass through other routes such as pollution such as drinking water, aquatic products such as drinking water, water products, etc., in addition to pollution such as drinking water, aquatic products, etc. These heavy metals from the soil into crop or grain grains, thereby entering the human food chain, and some may also cause cancer.
Car Zongxian said.