Understanding shifts in agricultural regimes and crop choices is central to archaeological research. This study examines macrobotanical remains from the Qianzhongzitou site in Shandong, eastern China (5000–2200 cal. BP), to explore how communities in a coastal–inland transition zone adapted their agricultural practices to shifting ecological conditions and patterns of social interaction. The results reveal a fluctuating sequence of crop choices. During the late Dawenkou to Longshan periods (5000–4000 cal. BP), a stable climate and macroregional exchange supported a mixed farming system dominated by foxtail millet (Setaria italica), supplemented by rice (Oryza sativa). In the Yueshi period (4000–3000 cal. BP), agricultural practices shifted toward intensified dryland farming of drought-tolerant broomcorn millet (Panicum miliaceum) and soybean (Glycine max), likely in response to hydrological changes associated with the 4.2 ka climate event, while small-scale rice cultivation persisted in favorable microenvironments. By the Zhou period (3000–2200 cal. BP), a cooler, drier climate combined with the political consolidation of the Qi State promoted renewed reliance on foxtail millet-based agriculture, with limited adoption of wheat (Triticum aestivum). At Qianzhongzitou, agricultural strategies evolved in close alignment with broader regional developments, political policies, technological innovations, and population movements. These findings highlight how farming communities in a transitional landscape continuously adapted their agrarian practices to address both climatic and political considerations and constraints.
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