Oasis civilization collapse under 3.9 ka climate event in Bactria, Central Asia

Abstract

Central Asia played a significant role in the early exchange of civilizations across Eurasia. The arid climate, which makes the local ecology sensitive to climate change and the well-preserved archaeological remains, make Central Asia an ideal location for studying the mechanisms of interactions between civilization evolution and environmental change. This research presents archaeobotanical, palynological and stable isotope records from the Djarkutan site in southeastern Uzbekistan, which was occupied between 4100 and 3700 cal yr BP. Our research shows that in the Late Bronze Age, after 4000 yr BP, the local agricultural structure was highly complex. Pollen and stable isotope result indicate a sudden drought event occurred in the local area around 3900 yr BP, which had an impact on the local oasis agricultural system. Subsequently, this event promoted the migration of northern steppe populations into Central Asia, leading to the development of an agro-pastoral economy in the research area.