Study on the Agro-pastoral Ecotone in Northern China and the Spread of Wheat in China

At present, the time series and spatial distribution of wheat spread in China are gradually clear according to archaeological excavations and literature studies, but there are problems that the eastern region is earlier than the western region in time and space, and the explanations of different disciplines conflict. The agro-pastoral ecotone in northern China is a transitional zone in arid and semi-arid climate. Historically, the climate and ecological changes in this region have led to the mixed evolution of people’s living patterns, forming an economic form of integration of agriculture and animal husbandry, thus becoming an important channel for wheat transmission in China. The agro-pastoral ecotone in northern China has the advantages of location, valley, livelihoods, ethnic groups and culture to promote the spread of wheat, which accelerates the spread of wheat to Shandong and Central Plains, and makes the spread of wheat in northern China show the phenomenon of time and space inversion.