草地资源：陆地生态系统的重要组成部分

Grassland resources are one of the important types of biotic communities on land. The global grassland resources are very rich, with a total area of 671,700 hectares, accounting for 52.17% of the total land area in the world, and the biomass accounts for 36% to 64% of the total green plants in the world. Grassland resources not only provide a large number of biological resources for humans, but also play an important role in maintaining the ecological balance of the entire land and protecting the human survival environment, which cannot be replaced by other natural resources. The total area of grasslands of different types in China is about 39,280 hectares, accounting for nearly half of the total land area and about four times the existing farmland area. Among them, the natural grasslands in the northern region account for about 78% of the grassland area in China and are the main body of grasslands in China. The grasslands in the semi-arid areas of the northern region not only provide an important production base for grassland animal husbandry in China, but also play an important role in wind and sand control, climate regulation, water conservation, environmental beautification, and air purification.