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篇目详细内容 |
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【篇名】 |
Paleofire indicated by triterpenes and charcoal in a culture bed in eastern Kunlun Mountain, Northwest China |
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【刊名】 |
Frontiers of Earth Science in China |
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【刊名缩写】 |
Front. Earth Sci. China |
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【ISSN】 |
1673-7385 |
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【EISSN】 |
1673-7490 |
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【DOI】 |
10.1007/s11707-009-0053-1 |
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【出版社】 |
Higher Education Press and Springer-Verlag |
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【出版年】 |
2009 |
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【卷期】 |
3
卷4期 |
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【页码】 |
452-456
页,共
5
页 |
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【作者】 |
Dan JIAO;
Shucheng XIE;
Huan YANG;
Shuyuan XIANG;
Xinjun WANG;
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【关键词】 |
loess sediment; charcoal; lipid; triterpenes; paleofire; Kunlun Mountain; Qijia culture |
【摘要】 |
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A series of biomarkers were analyzed in the 4000 a B.P. loess sediments in Balong, Dulan County at the north of the eastern Kunlun Mountain in Northwest China using gas chromatography-mass spectrometry. Olean-2,13(18)-ene, olean-2,12-ene, urs-2,12-ene and 5a14a17a20R-stigmasterane identified in an ancient culture bed were observed in association with charcoal grains, believed to be the products of paleofire due to the anthropogenic activity in Qijia culture. These triterpenes were proposed to be derived from dehydration of oleanolic acid and ursolic acid present in angiosperms, and 5a14 a17a20R-stigmasterane was derived from stenols; they both were formed during incomplete combustion. The n-alkane distributions show a shift in the dominant carbon from C27 or C29 to C31, indicative of the abrupt change in paleovegetation from woody to herbaceous plants driven by the changing paleoclimate at 4000 a B.P. after the Holocene Optimum. Coincidently, the Qjijia agriculture culture began to collapse during the 200-year cooling and dryness, and was replaced by nomadism in the mountainous area. The paleofire identified is such a record as to document the change of ancient culture induced by paleoclimate change. |
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