The desert of Inner Mongolia has Mu'us in advance 200 km south to 1600 years. According to Professor LI Chengsen of the Beijing Institute of Botany of the Academy of Sciences of China, who studied the ruins of the ancient city of Tongwan in Shaanxi Province, witness the desertification, the average speed of current desertification is 126 m per year.
Former capital of the Huns in ancient China built between 413 and 418, the city of Tongwan is now located in the heart of the desert Mu'us. The studies of the flora reveal that she was once surrounded by forests of Platycladus orientalis, lakes and rivers, and it enjoyed a temperate climate. The average annual temperature there was between 7,8 and 9,3ºC with average annual rainfall between 403,4 and 555 mm. Currently, the average temperature is between 0,2 and 0,7ºC and rainfall are between 60 and 100 mm. Drills have declined by 200 km to the south, until Yan'an.
Sources: Academy of Sciences of China,