气候变化领域集成服务门户(CCPortal): An environmental perturbation at AD 600 and subsequent human impacts recorded by multi-proxy records from the sediments of Lake Mayinghai, North China

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DOI	10.1177/0959683618798159
	An environmental perturbation at AD 600 and subsequent human impacts recorded by multi-proxy records from the sediments of Lake Mayinghai, North China
	Shen, Zhongwei; Liu, Jianbao; Xie, Chengling; Zhang, Xiaosen; Chen, Fahu
通讯作者	Liu, JB (通讯作者)
发表日期	2018
ISSN	0959-6836
EISSN	1477-0911
起始页码	1870
结束页码	1880
卷号	28 期号:12
英文摘要	Modern observations indicate that a dramatic increase in the intensity of human activity is the main cause of environmental degradation. However, the timing of the onset of significant human impacts on regional environments during the historical period is unclear. In this study, an AMS C-14-dated 878-cm-long sediment core (MYH14B), from Lake Mayinghai in the farming-pastoral ecotone of northern China, was used to study the long-term relationship between the ecological environment and human activity. The area is characterized by a fragile ecological system and is sensitive to environmental change and human activity. We found evidence for abrupt sedimentary changes beginning around AD 600, revealed by the increased (decreased) content of exogenous (endogenous) elements, a decrease in grain size and the appearance of quartz particles with V-shaped percussion cracks. This evidence indicates an abrupt increase in sediments transported by surface run-off and that a large amount of freshwater was injected into the lake. The climate was stable at the time and therefore, combined with historical documentary evidence, we attribute this event to the excavation of a river channel flowing into the lake, in association with the construction of nearby Fenyang Palace by Emperor Yang during the Sui Dynasty. Subsequently, the content of exogenous elements in the sediments was significantly positively correlated with the intensity of deforestation, cultivation and grazing, indicating that these elements can be used as a proxy of the intensity of human activity. The variation of this proxy demonstrates that intensified human activity occurred during AD 600- 1100 and after AD 1350, and that human activity weakened during AD 1100-1350, which is supported by evidence from historical accounts and changes in the population size of Shanxi Province. Overall, our findings reveal a substantial conflict between human activity and environmental stability in the farming-pastoral ecotone of northern China during the Sui Dynasty (AD similar to 600). In addition, the sensitivity of the lake response to human activity revealed in this study highlights the importance of further paleolimnological studies in the region.
关键词	CLIMATE-CHANGE SOIL-EROSION GRAIN-SIZE MONSOON HOLOCENE ZONE DESERTIFICATION DYNAMICS PLATEAU SEM
英文关键词	ecological environment; human activity; Lake Mayinghai; lake response; lake sediments; North China
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000450145600003
来源期刊	HOLOCENE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259162
推荐引用方式 GB/T 7714	Shen, Zhongwei,Liu, Jianbao,Xie, Chengling,et al. An environmental perturbation at AD 600 and subsequent human impacts recorded by multi-proxy records from the sediments of Lake Mayinghai, North China[J]. 中国科学院青藏高原研究所,2018,28(12).
APA	Shen, Zhongwei,Liu, Jianbao,Xie, Chengling,Zhang, Xiaosen,&Chen, Fahu.(2018).An environmental perturbation at AD 600 and subsequent human impacts recorded by multi-proxy records from the sediments of Lake Mayinghai, North China.HOLOCENE,28(12).
MLA	Shen, Zhongwei,et al."An environmental perturbation at AD 600 and subsequent human impacts recorded by multi-proxy records from the sediments of Lake Mayinghai, North China".HOLOCENE 28.12(2018).