Complexity of agricultural economies in the Yiluo region in the late Neolithic and bronze age (3500–221 BC): An integrated stable isotope and archeobotanical study from the Tumen site, North China

The region of Yiluo in North China witnessed the development of social complexity in the Neolithic period and the emergence of the first Chinese state society in the early Bronze Age. However, the agricultural economies in the Neolithic–Bronze Age periods of this region and its influence on the social complexity in this area have not been adequately understood, owing to the relative lack of evidence from archeobotany, chronology, and stable isotope analysis in this region. Archeobotanical and isotopic evidence, together with chronological data from the Tumen site, reveals that the complexity of the agricultural economy composed of millet and rice appeared during the late Yangshao period in the Yiluo region and became more intensified in the following Longshan and Bronze Age periods. During the Yangshao and Longshan periods, environmental factors such as landform and hydrology were likely important factors for the diverse agricultural patterns. The complexity of the agricultural economy has an influence on settlement hierarchy and population growth, suggesting that the rise and intensification of the complex agricultural economy was an important driving force in societal development in the Yiluo region.