Land area measuring instrument statistics the general situation of desertification

At present, the Inner Mongolia Autonomous Region is one of the provinces (regions) with the most serious desertification hazards. The total area of ​​desertification accounts for 25.11% of the country's total area of ​​desertification. Desertification land is distributed in 76 counties (cities) and 995 towns (Sumu). The statistical results of desertified land area measuring instruments in the 1980s and 1990s indicate that the desertified land area in the sand and desert areas of Inner Mongolia Autonomous Region was 30433063hm2 in the 1980s and 31352001hm2 in the mid-1990s, an increase of 918935hm2 from the 1980s to the 1990s, with an average annual growth rate of About 0.13%.

Through the precise determination of the land area measuring instrument, the available land area is reduced year by year. According to the Wushenqi land survey data, quicksands engulfed large areas of arable land and grazing land. At the beginning of the founding of the People's Republic of China, there were 7330km2 of grazing land available in the whole country, and it was reduced to 7260km2 in 1976. By 1981, only 6060km2 of grazing land was available, and the annual decline was 240km2.

The decline in land productivity is one of the major hazards of reducing desertification due to desertification. Because of the dry lands caused by land desertification, the thickness of topsoil erosion is 5~7cm per year. The loss of organic matter is 7770kg, physical clay is 39030kg, nitrogen is 390kg, and phosphorus is 549kg per 1hm2. At the same time, desertification has spawned various types of pastures with sparse vegetation, degraded grasses, and reduced productivity.

Land desertification is one of the major environmental-economic problems facing the world today. It threatens human survival and development. China is one of the countries most seriously affected by desertification in the world. The land area measuring instrument measures and counts about 1.65 million km2 of desert, Gobi and desertification land in the country. Desertification lands are mainly distributed in arid, semi-arid, and semi-humid areas in the north. From northeast to northwest, a discontinuous arc distribution belt is formed, especially in the semi-arid area of ​​Helan Mountain.

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