Search

Situated in the middle Hexi corridor, a vital passage of the ancient Silk Road, the Heishuiguo site was a military town on the northwestern frontier of the Han Dynasty (202 BCE–220 CE). To understand the lifestyle of the Heishuiguo population, levels of dental caries and tooth wear were assessed. Archaeological findings and historical records revealed a mixed subsistence strategy dependent upon agricultural production and domesticated animals at Heishuiguo. This was also supported by evidence from stable isotope analysis. Teeth are an excellent material for the reconstruction of ancient diet, subsistence strategies, and social behavior. The rate of dental caries in the Heishuiguo population fell into the range of mixed economic population. Tooth wear analysis, however, shows a conflicting result. Anterior tooth wear is particularly severe at Heishuiguo, indicating subsistence practices similar to hunter‐gatherers and modern Xinjiang Kazakhs. As a major Han garrison, the majority of the Heishuiguo populace were either immigrants or the descendants of immigrants. Their diet, with rich nutritional value, portability, and adapted to long‐term preservation needs, suited environmental requirements at Heishuiguo. However, these foods generally required heavier use of cutting and tearing motions with the anterior teeth. Frequent occlusion (alignment) as a result of such actions resulted in severe tooth wear. Such tooth wear may be attributed to a preference for tough, dry foods, such as nang cake along the Heishuiguo population, as well abundant meat consumption. Such a dietary culture resulted from the hot and dry climate, complex geographical conditions, and abundant resources at Heishuiguo. The result was that a unique lifestyle and dietary culture gradually formed at Heishuiguo due to this creative adaptation to the local environment. [ABSTRACT FROM AUTHOR]

The eastern ancient Silk Road (EASR)—an area critical in linking Central China with the pastoralist societies of the eastern Eurasian Steppe and Central Asia—was a key component to trans-Eurasian exchange since the Bronze Age. Despite the area's importance, not much is known regarding the spatio-temporal variation of human diets and the associated subsistence practices during the Bronze Age. This dearth of information is largely due to the absence of key evidence from the EASR during 3000–2200 years before present (yr B.P.). In this study, we report new carbon and nitrogen isotopic data, including radiocarbon dates of human and animal bones unearthed from the Shijia-Yucun (SJ-YC) site in the EASR, dated between ∼2700 and 2500 yr B.P. During our target period of study, the humans, pigs and dogs living in SJ-YC mainly consumed C 4 foods (millets and millet by-products), while herbivorous livestock consumed a mix of C 3 and C 4 plants. Combined with published isotopic and archaeobotanical data, we detected an asynchronous transformation of dietary patterns in different regions of the EASR during the Bronze Age. Between 3500 and 2200 yr B.P., staple foods for most western EASR humans shifted from C 4 to mixed C 3 and C 4 foods. In the eastern EASR, C 4 foods remained dominant in human diets throughout the Bronze Age. Patterns in dietary changes are not completely consistent with the various trajectory of crop cultivation. We propose that, in the context of Bronze Age trans-Eurasian exchanges, humans adopted different livelihoods throughout the EASR to deal with the survival pressures and social customs associated with variations in climate, population, and geopolitical factors. Our work provides vital evidence for dietary and subsistence variation in the EASR and explores the complicated relationship between Bronze Age humans and their environment. • Humans were reliant on the millet-based farming in east of the Liupan Mountain in 2700–2500 yr B.P. • Dietary and crop cultivating shifts differed along the Bronze Age Eastern Silk Road • Humans adopted various strategies in the Bronze Age Eastern Silk Road to deal with survival pressures and social customs [ABSTRACT FROM AUTHOR]