Sandstorm weather is one of the main disasters affecting northern China. What happened to it?

Recently, most parts of China have been affected by dusty weather. Sandstorm weather is one of the main disasters affecting northern China.

Sandstorm is the general name of sandstorm and sandstorm. Mainly refers to such a disastrous weather: due to strong wind, a large amount of dust on the ground enters the air, which reduces the air quality and forms turbidity, making the visibility less than 1km. It is most common in northwest China and northern North China. The impact of sandstorm on traffic mainly includes: first, the reduced visibility will affect driving and aircraft take-off and landing; Second, buried sand subgrade. Traffic jam. Sand burial means that farmland, rivers, bungalows, railways and grasslands are buried by a large number of quicksand, which poses a serious threat to transportation.

The climate in northwest and northern North China is mainly arid and semi-arid, and the terrain is also quite special. Therefore, the natural phenomenon of sandstorm is formed under special meteorological conditions and geographical environment. The formation of sandstorm also needs three conditions: dust source, strong wind and unstable atmospheric stratification. Affected by sandstorms, a large area of farmland is buried by sand, or wind erosion blows away fertile soil, resulting in crop yield reduction or even no harvest. Sandstorm will aggravate land desertification, cause serious pollution to the atmospheric environment and seriously destroy the ecological environment, so it is imperative to conduct in-depth research on sandstorm. Soil wind erosion refers to soil erosion. Dust storms have different wind erosion hazards to dust sources and soil in the affected areas. The depth of wind erosion can reach 1- 10 cm, which will seriously damage the land productivity and farmland and grassland in the source area.

Vegetation can effectively reduce the erosion of soil by wind erosion, also can effectively reduce the wind speed, increase the coverage of surface soil, and greatly reduce the exposed surface area of the ground. When the sandstorm is formed, the wind speed should reach more than 4, but the maximum wind speed can be reduced by more than 50% in shrub grass and shrub vegetation. Through the study of shrubs and shrubs, it is found that they are most suitable for growing in northern China, and a large number of shrub ecological protection systems can be planted to resist early drought and saline-alkali erosion.