Reconstructing subsistence at the Yingpanshan and Gaoshan sites in Sichuan province, China: Insights from isotope analysis on bone samples and charred crop remains

摘要

During the Neolithic period, the Chengdu Plain was a key region where two important crops, rice and millet, were cultivated together. Millet was probably introduced from north-western China c.3500-3300 cal. bce, and rice came from the Middle Yangtze River c.2600 cal. bce. In this study, human and faunal remains, as well as charred crop grains, were collected from the Yingpanshan (3300-2600 cal. bce) and Gaoshan (2500-2000 cal. bce) sites where the dominant crop was millet and rice, respectively. Carbon and nitrogen isotope analyses were conducted on human bones and the ecofact samples in order to reconstruct the subsistence at the sites. The results indicate that the diets of two individuals recovered from the Yingpanshan site consisted of both C-3- and C-4-based foods, predominantly the former. By contrast, Yingpanshan pigs consumed a large quantity of C-4 fodder. This result, combined with the ecofact evidence, suggests that millet was the main crop at the Yingpanshan site. It also highlights the fact that the two Yingpanshan individuals might be non-locals and/or belonged to later periods. On the other hand, the diet of the Gaoshan community was dominated by C-3-based foods. When considering the archaeobotanical evidence at Baodun, a site contemporaneous with and near to the Gaoshan site, it can be stated that rice was an important food resource for the Gaoshan community. This study also suggests how crops were managed at the two sites. The Yingpanshan people might have used manure for growing millet. Both manuring and irrigation might have also been practised by Gaoshan's rice farmers. However, more studies are required to understand the extent of manuring and irrigation in their agricultural economies.