QUAN Mingying, GAO Yang, XIONG Kangning, LV Yina, SHEN Weidan

(School of Karst Science, Guizhou Normal University/ State Key Laboratory Incubation Base for Karst Mountain Ecology Environment of Guizhou Province, Guiyang 550001, China)

Abstract: Holocene is the latest interglacial period to mankind, and the climate change during this period has attracted attentions of many scholars. The climate change since Holocene in the east Asian monsoon region of China has played an important role in revealing driving mechanisms of the global climate change and predicting the future change. By analyzing data of pollen, loss on ignition, the contents of organic carbon and nitrogen from Core JL15 of a sedimentary tarn, Jiulongchi Wetland, in the Fanjingshan World Natural Heritage property, which locates in the transition zone of southwest monsoon and southeastern monsoon, and based on 14C dating results of Accelerator Mass Spectrometry (AMS), Holocene paleoenvironment evolution processes in this area were established. The results showed that since Holocene, Fanjingshan had experienced five climate change stages, cool-dry period, transition period, warm-wet period, warm-dry period and cool-dry period. Among these periods, the stage III (8.0-4.6 cal ka BP) was the warmest period of the Holocene Thermal Maximum. Overall, during early and middle Holocene, climate changed from cool-dry to warm-wet, however in late Holocene, it turned into cool-dry gradually. But there existed a trend of being warmer. The environmental proxies of Core JL15 had also recorded five relatively obvious cooling events since Holocene, occurring in 2.6, 3.4, 4.2, 9.4 and 10.0 cal ka BP. The 4.2 and 9.2 cooling events were relevant to the Ice-rafted debris (IRD) event in north Atlantic. Similar to other records of southwest China, the cooling events reflected by Core JL 15 of Fanjingshan showed similar correlations with the IRD event. This may relate to the complexity of the driving mechanism of global climate change, which needs later discussion.

Key words: Fanjingshan; Holocene; environment proxies; paleoclimate change

EARTH AND ENVIRONMENT Vol.47, No.5, Tot No.331, 2019, Page 610-621