China has identified more than 1.2 billion mu of pollution-free cultivated land

The China Geological Survey recently released a report on the geochemical survey of cultivated land in China (2015). This is the first time that China has conducted a "physical examination" of cultivated land throughout the country. According to the report, 1.272 billion mu of pollution-free cultivated land has been identified in China, accounting for 91.8 percent of the total cultivated land in this survey, mainly distributed in Jiangsu, Zhejiang, Shanghai, Northeast, Beijing, Tianjin, Hebei, Shandong, Northwest, Jinyu and Qinghai-Tibet regions.

The report also shows that the proportion of moderate to severe heavy metal pollution or exceeding the standard accounts for 2.5%, the coverage area is 34.88 million mu, the proportion of slight-slight pollution or exceeding the standard accounts for 5.7%, and the coverage area is 78.99 million mu. In addition, the soil organic matter decreased in some areas, and the trend of soil Alkalization in the north appeared at the same time as the trend of soil acidification in the south.

According to reports, this survey is a professional survey organized and completed so far in China with the largest number of analytical elements, the highest survey accuracy and the strictest standards. Through the high-precision test of 54 element indexes of more than 600,000 soil, water, biological and other samples, more than 30 million data have been obtained, and the land geochemical dynamic database of the whole country and 31 provinces (autonomous regions and cities) has been established. The geochemical status of cultivated land was evaluated.