Causes of windy weather in arid and semi-arid areas of northwest China

① The altitude is higher, but the difference is significant. On the plateau around 1000 meters, there are not only mountains over 3000 meters, but also inland basins with an altitude of 250~500 meters. Turpan basin, Aiding Lake, elevation155m.

(2) Being located in the Eurasian continent, far away from the ocean, it is less affected by the summer monsoon, and the humid airflow in the ocean is blocked by mountains, so it is difficult to go deep and the climate is dry. The annual precipitation in the east is about 400 mm, while that in the west is reduced to below100 mm. The temperature is annual range, with a large daily range and windy weather.

③ Vegetation is mostly desert and partly grassland. Soil is mainly developed under desert vegetation and grassland vegetation, with low organic matter content and high soluble salt content. There are far fewer species here than in the eastern monsoon region.

④ Most areas belong to the internal flow area, with short rivers, and the flat runoff mainly comes from the temporary water flow formed by heavy rain; Mountain runoff is mainly replenished by rain and snow melt water. There are many lakes, but most of them are saltwater lakes.

⑤ The influence of human beings on nature is far less extensive and profound than that in the eastern monsoon region. Water is the decisive factor of agricultural development. Where there is water irrigation, many fertile oases are formed. Grassland has been a pasture since ancient times, but if it is not used rationally, it will often lead to the expansion of desertification.