What are the causes of desertification in northwest China?

Because most parts of the northwest belong to warm temperate arid climate, far away from the sea, and the altitude here is relatively high, surrounded by mountains and plateaus, water vapor can't enter here, so the precipitation in the northwest is the lowest in the country all the year round, so there is often not much vegetation to support, and most of the places are mainly desert.

Speaking of the northwest of China, I believe that the first reaction of most people is Gansu and Ningxia. Northwest China mainly includes Gansu, Qinghai, Ningxia, Xinjiang and sometimes Shaanxi. After all, Shaanxi has always belonged to the Western Regions in history. In the northwest of China, it is also a sparsely populated place. There are many desert areas here, but the population density is relatively small. Many people find it strange. Why are there so many deserts in the northwest? The key reason is.

Northwest China is located in an arid climate, even if it is slightly humid, it can only be semi-arid, because most parts of the northwest are far from the ocean, so it will hardly be affected by the ocean climate. In addition, the surrounding areas are relatively high-altitude plateaus and mountains, and water vapor cannot enter the northwest, which is why there is little rain in the northwest, and it is the place with the least rainfall and the largest evaporation in the same latitude in the world. Another reason is related to human activities.

In modern times, because of the continuous growth of population, the pressure on land is also great. People began to cut down trees here to reclaim land, which led to desertification. In addition, most people in the northwest are mainly nomadic, and overgrazing will also lead to less and less natural resources. Fortunately, in recent years, China's afforestation efforts have begun to increase, and the protection of wild animals has become stronger and stronger, so the environment in the northwest is definitely getting better and better. Today's northwest has become an important tourist attraction, such as Qinghai Lake and Qilian Mountain. The scenery in these places is very spectacular, attracting many people to take photos and sightseeing here every year. ?