Holocene rangeland characteristics on the northeastern Tibetan Plateau in relation to climate and pastoralism from sedimentary ancient DNA

作者：Ying Liu, Kathleen R. Stoof‐Leichsenring, Bernhard Diekmann, Ulrike Herzschuh · 发表于：Quaternary Science Reviews · 年份：2024 · DOI：10.1016/j.quascirev.2024.108850 · 被引用次数：7 · 研究领域：Geology and Paleoclimatology Research、Rangeland Management and Livestock Ecology、Archaeology and ancient environmental studies

The northeast Tibetan Plateau, functioning as an alpine pasture, has been influenced by prehistoric settlements for millennia. However, the extent to which climate and anthropogenic activities have shaped this rangeland remains contentious. Here, we present sedimentary ancient DNA evidence from Lake Donggi Cona sediment core, focusing on the trn L p6-loop region of vascular plants and the internal transcribed spacer (ITS1) region of nuclear ribosomal DNA for Poaceae and Cyperaceae. Our findings indicate that before 7.4 cal ka BP, the rangeland was characterized by alpine steppe with low richness, influenced by dry environmental conditions. By 7.4 cal ka BP, more taxa migrated to the study region, with a relatively high richness supported by a humid environment. The climate conditions, coupled with low grazing pressure, sustained a relatively high pastoral quality. Intensified nomadic activities after 4 cal ka BP contributed to a severe decline in pasture quality, characterized by a high abundance of poisonous taxa. This study highlights that both human activity and moisture availability contribute to the rangeland characteristic, with human activity as the predominant factor since 4 cal ka BP. • Sedimentary ancient DNA reveals characteristic changes to Tibetan rangeland during the Holocene. • The ITS1 metabarcoding method for Poaceae and Cyperaceae has high taxonomic resolution. • Pastoralism causes a decline in pasture quality during the late Holocene. • Moisture availabilit...