Grassland originated in the dry and cold period of global climate (appearing in Cenozoic), similar to the wilderness, desert and shrub land where they often blend. In fact, Gramineae itself (Gramineae and Gramineae) only evolved in the early Cenozoic. The earliest date of grassland appearance varies from place to place. In many areas, a series of vegetation types can be found in Cenozoic fossils, when the climate changed gradually. For example, in the past 50 million years, the tropical rain forest in central Australia has been replaced by wilderness, grassland and finally desert.
China is one of the countries with the richest grassland resources in the world, with a total grassland area of nearly 400 million hectares, accounting for 40% of the total land area, which is three times of the existing cultivated land area.
Extended data:
Grassland distribution in the world:
World grassland distribution editor
In Eurasia, grassland vegetation starts from the lower reaches of the Danube River in Europe in the west and extends eastward in a continuous strip, passing through Romania, the former Soviet Union and Mongolia, and reaching China directly, forming the widest grassland belt in the world.
In North America, from the north, starting from the South Ross River, along the longitudinal direction, reaching the Radar River, forming a north-south grassland belt. Because of the large ocean area and small land area in the southern hemisphere, the grassland area is not as large as that in the northern hemisphere, and it is scattered and the zonal distribution is not obvious.
In South America, mainly distributed in Argentina and Uruguay;
In Africa, it is mainly distributed in the south, but the area is very small.
Reference source: Baidu Encyclopedia-Grassland