Vegetation succession and East Asian Summer Monsoon Changes since the last deglaciation inferred from high-resolution pollen record in Gonghai Lake, Shanxi Province, China:

摘要: A cal. 20-year-resolution pollen record from Gonghai Lake presented the detailed process of mountain vegetation succession and East Asian Summer Monsoon (EASM) changes since last deglaciation in Shanxi Province, North China. Modern distribution lake surface assemblages suggested that fossil mainly came local surrounding Lake, which reflected elevational plant communities study area. From 14,700 to 11,100cal. yr BP, open forests meadows dominated by shrubs herbaceous species area, suggesting a weak EASM with less precipitation. In period between 11,100 7300cal. bushwoods grasses were gradually replaced mixed broadleaf-conifer forest, first developed pioneer Betula Populus then Picea, Pinus, Quercus, implying an enhanced increased temperature During 7300-5000cal. warm-fitted trees became expanded widespread, indicating climax community forest warm humid climate higher sufficient precipitation strongest EASM. 5000 1600cal. Pinus increased, but Quercus decreased, showing breakup recession Since under threats land reclamation deforestation, cover sharply grass lands developed. The inferred asynchronous oxygen isotope records stalagmites southern We suggest existence remnant Northern Hemisphere ice sheets relative low sea levels might hampered northward penetration early Holocene, caused maximum monsoon reach northern China until mid-Holocene.