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The development and subsistence strategies adopted in ancient settlements are crucial to the understanding of long-term human–environmental interaction in the past. Here, we reassess the chronology of the ancient walled settlement of Sanjiao in the Hexi Corridor in northwestern China through accelerator mass spectrometry radiocarbon (AMS 14C) dating and explore the subsistence of the settlers inside through the identification of carbonized seeds and charcoal. In addition, high-resolution paleoclimate records in the Hexi Corridor and nearby regions are employed to explore the reason for the construction of Sanjiao. Our results show that Sanjiao was built around 828 cal BC and remained inhabited through 384–116 cal BC. This indicates Sanjiao is the earliest known walled settlement in the Hexi Corridor. Ancient people at Sanjiao consumed crops such as barley, broomcorn millet, and foxtail millet, and used wood from Tamarix chinensis , Tamarix , Salix , Picea , Hippophae , Betulacea e, and Poaceae as fuel. The construction date of Sanjiao correlates with climate deterioration and social upheavals in the Hexi Corridor, potentially suggesting a defensive purpose for the site. [ABSTRACT FROM AUTHOR]

In recent years, archaeologists have studied how ancient humans have shaped, and been shaped by, their surrounding environments in an effort to provide valuable insight into the patterns of human-environment interaction during prehistoric and historical periods. Along the Heihe River in Hexi Corridor of northwest China, archaeologists have found many ancient cities that are good places to explore changes in human settlement patterns in relation to environment change in historical periods. In this paper, we present our investigation of seven ancient cities to clarify the chronology of these cities and their strategy for wood use in the area through the application of radiocarbon dating and charcoal identification. Our results suggest that the ages of many cities are younger than previous estimates, and humans mainly used Tamarix and mixed Tamarix and broad leaf trees in the lower and middle reaches of the Heihe River basin between ∼ AD 240–1380 respectively, and roughly matches the modern spatial distribution of natural woody vegetation in the area. In comparison to the results of archaeological, paleoclimatic and historical studies in Hexi Corridor, we propose that ancient human strategies for wood use and their impact on environment of the Heihe Basin are primarily relevant to human lifestyles rather than climate change. [ABSTRACT FROM AUTHOR]

We report dozens of direct radiocarbon dates on charred grains from 22 archaeological sites of the Neolithic and Bronze Ages in the Hexi Corridor, northwest China, a key region for trans-Eurasian exchange in prehistoric and historical times. These charred grains include remains of wheat and barley domesticated in southwest Asia and broomcorn and foxtail millet which originated from north China. Together with previously published radiocarbon dates, we consider these newly obtained radiocarbon results in the context of material cultures associated with them, to explore an episode of trans-continental cultural exchange foci at the Hexi Corridor. Our results show that millet cultivators who used painted potteries from the western Loess Plateau first settled the Hexi Corridor around 4800 BP. Communities who cultivated wheat and barley moved into this region from the west around 4000 BP, bringing with them technologies and materials not seen in central China before, including bronze metallurgy, mud bricks, and mace heads. This was part of the east–west contact which became evident in the Hexi Corridor since the late fifth millennium BP, and continued over the subsequent two millennia, and predated the formation of the overland Silk Road in the Han Dynasty (202 BC–AD 220). [ABSTRACT FROM AUTHOR]

Cattle, sheep, and goats were first domesticated in West Asia, but the history of utilization of these livestock in China is controversial. The Hexi Corridor, located in the northwestern Gansu-Qinghai (GQ) region of northwest China, was a conduit of cultural exchange between East and West Eurasia. Based on the identification and radiocarbon dating of animal remains unearthed from two Xichengyi culture sites in the Hexi Corridor (Huoshiliang (火石梁) and Ganggangwa (缸缸洼), ranging from 4060 cal BP to 3650 cal BP), combined with other archaeological data published from the GQ region, this study aims to reveal the history of pastoralism and the timing for the emergence of the earliest domesticated cattle and caprines in the GQ region. Our results suggest that directly dated domestic sheep/goat bones (4060-3840 cal BP) and cattle bones (3970-3830 cal BP) unearthed from these two sites are the earliest yet reported for sites within GQ region, but are significantly later than those reported elsewhere in the temperate-grassland areas of northern China. Furthermore, the unearthed animal remains suggest that early pastoralism in the GQ region occurred at the beginning of the Qijia/Xichengyi culture period (∼4000 cal BP), significantly later than other previously reported evidence for the substantial increase of sedimental coprophilous fungal spores in this region since∼5600 cal BP. We argue that previously reported evidence for increased coprophilous fungal spores in the GQ region before 4000 cal BP may come from raising domestic pigs and/or wild animals rather than domestic cattle and sheep/goats, and should not be taken as evidence for the intensification of pastoralism of cattle and sheep/goats. • The earliest domesticated cattle and caprines in GQ region were raised about 4000 cal BP. • The early pastoralism in the GQ region expanded during the period of the Qijia/Xichengyi culture (∼4000 cal BP). • The increase of coprophilous fungal spores before 4000 cal BP in GQ region may not come from domestic cattle and sheep/goats. [ABSTRACT FROM AUTHOR]