Where are the three black soil regions in the world?

The three major black soil regions in the world are located in the northeast of China, the Ukrainian Great Plains and the Mississippi River Basin in the United States.

Black soil areas in Northeast China are mainly distributed in Heilongjiang, Jilin, Liaoning and Inner Mongolia Autonomous Region, accounting for about one-fifth of the country's annual grain output. It is an important supplier of commodity grain such as corn and japonica rice in China, and its commodity volume and grain transit volume rank first in the country.

The plain of Ukraine covers an area of about 6.5438+0.9 million square kilometers, and the Mississippi River basin of the United States covers an area of about 6.5438+0.2 million square kilometers. Like the black soil in the northeast, it is distributed in the cold temperate zone with four distinct seasons. Due to lush vegetation and cold winter, a large number of dead leaves are difficult to decompose, and after thousands of years, thick humus, that is, fertile black soil layer, has been formed.

Extended data

Development of Black Soil Area in Northeast China: During the reclamation in 1950s, this fertile field was plowed with imported tractors with 54 horsepower. Soil experts found that the black soil layer in the soil is 30- 100 cm thick, and the organic matter content is as high as 5%~7%, which is several times that of yellow soil. Black land has become one of the symbols of northeast China. People always use "one soil and two oils" to describe its fertility and preciousness.

From 1963 to1976,540,000 educated youths joined the ranks of developing the Great Northern Wilderness. Educated youth from Beijing, Tianjin, Shanghai, Harbin and other large and medium-sized cities planted urban civilization and developed black land in remote frontiers.

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