• 责任者：Zhu Yun (Key Laboratory of Humid Subtropical Eco-Geographical Process ; Ministry of Education ; College of Geographical Sciences ; Fujian Normal University ; Fuzhou 350007 ; China) ; Zhao Zhijun
• 刊名：Quaternary Sciences
• 出版年：2013
• 卷期：33(1)
• 关键词：泥炭 ; peat ; 古环境 ; paleoenvironment ; 湖北 ; Hubei Province
• 页码：p.155-166
• 图表：illus., 2 tables, 69 refs.
• 分类号：1400
• issnNo：ISSN1001-7410
• isbnNo：CN11-2708/P

The Dajiuhn Basin （ 31 °27＇ ～ 31 °32＇N, 109 °57＇ ～ 110°02 ＇E） is located at Shennongjia, which is a typical East Asian Monsoon region,and preserves a largest and highest sub-alpine peat wetlands of Central China. A long core （DJH-2） with ca. 45m was obtained in the central of the basin（31°29＇N, 109°59＇E） , which was sampled at 1 cm intervals. TOC and ct-cellulose δ13C were measured for all samples, and plant residues were identified for the selected samples in peat layers. AMS14C dating by pollen concentration showed that the peat layer with black and brown color obtained between 821 ～ 430cm on the top of DJH-2 core covers 59.8 -26.1 kaB. P., that corresponds with MIS 3 stage period. The history of significant enhancement of the East Asian summer monsoon during MIS 3 was directly recorded. Results showed the vegetation was suitable for growth and organic matter was well preserved during MIS 3 at Shennongjia Basin. The atmospheric relative humidity during MIS 3 was reconstructed based on c~-cellulose $13C ,and its average value was 72% which was higher than that in the Late Holoeene. In the early （60.0 ～ 49.0kaB. P. ） , mid （49.0～ 38.5kaB. P. ） and late （38.5 ～ 26. lkaB. P. ） period of MIS 3, they were 75%,69% and 72% respectively. The atmospheric relative humidity during the early MIS 3 was higher than the value in late and mid period,it is consistent with temperature decreasing trend from early to late in MIS 3. Five wave cycles of millennial-scale climate change was recorded. The four cold and dry events were consistent with Heinrich events and the warm events was corresponding with D-O warm events. Compared with others records on the world, this paper reveals that the variation of East Asia summer monsoon circulation intensity mainly controlled by solar radiation in the millennial-scale, and power spectral analysis on peat records of the Dajiuhu Basin shows a number of significant cycles which provide a strong support point of view for that East Asian summer monsoon is mainly controlled by the solar output in millennial scale.