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Anthropogenic origin of a change in the fire-climate relationship in northern China after~2000 yr BP:Evidence from a 15,500-year black carbon record from Dali Lake

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Journal of Geographical Sciences 2022年第6期32卷 1136-1156页

作者： ZHANG Zhiping LIU Jianbao CHEN Shengqian ZHANG Shanjia JIA Xin ZHOU Aifeng ZHAO Jiaju CHEN Jie SHEN Zhongwei CHEN Fahu Key Laboratory of Western China’s Environmental Systems(Ministry of Education) College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China Group of Alpine Paleoecology and Human Adaptation(ALPHA) State Key Laboratory of Tibetan Plateau Earth SystemResources and Environment(TPESRE)Institute of Tibetan Plateau ResearchCASBeijing 100101China CAS Center for Excellence in Tibetan Plateau Earth Sciences CASBeijing 100101China School of Geography Nanjing Normal UniversityNanjing 210023China State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentCASXi’an 710061China

There are debates regarding whether a wet and warm climate or a dry and cold climate dominated Holocene fire activity in northern China on the millennial timescale,and when human activities overtook climate change as the dominant control on fire occurrence in the *** we present a high-resolution fire history for the past~15,500 years from a sediment core in Dali Lake,located in the foothills of the Greater Hinggan Mountains,one of the areas of highest fire risk in *** results demonstrate that fire activity was rare during the last deglaciation(~15,500–11,700 yr BP),gradually increased at the beginning of the Holocene,and reached its highest level during~9000–5000 yr BP,after which there was a decreasing ***,after~2000 yr BP this decreasing trend ended,and the most prominent feature is a peak in fire activity during the Medieval Warm Period(MWP).Overall,fire activity corresponded well to changes in the East Asian summer monsoon(EASM)precipitation on the millennial timescale during~15,500–2000 yr BP,but this relationship changed after~2000 yr *** propose that fire activity in northern China on the millennial timescale during~15,500–2000 yr BP was dominated by the biofuels reserve under the control of the EASM *** contrast,with the intensification of human activities after~2000 yr BP,human activity caused a~62%–73%increase in fire activity,which altered the fire-climate relationship that had previously prevailed in northern *** results indicate that a wet-warm climate(increased EASM intensity),rather than a dry-cold climate,was the dominant control on fire activity in northern China during 15,500–2000 yr BP on the millennial timescale,but that human activities played an important role in fire occurrence after~2000 yr BP.

关键词： fire activity East Asian summer monsoon biofuels reserve human activities northern China

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