江汉平原12.76 cal. ka B.P.以来环境干湿变化的高分辨率研究

doi:10.13249/j.cnki.sgs.2012.07.878

地理科学 ›› 2012, Vol. 32 ›› Issue (7): 878-884.doi: 10.13249/j.cnki.sgs.2012.07.878

江汉平原12.76 cal. ka B.P.以来环境干湿变化的高分辨率研究

李枫¹(), 吴立¹, 朱诚¹(), 孙伟¹, 王晓翠¹, 孟华平², 刘辉², 齐士峥³, 龚琪岚³, 朱光耀⁴, 周凤琴⁵, 李溯源⁶, 欧阳杰⁷

1. 南京大学地理与海洋科学学院, 江苏南京 210093
2. 湖北省文物考古研究所, 湖北武汉 430077
3. 高雄师范大学地理学系, 台湾高雄 80201
4. 蚌埠学院人文社会科学部, 安徽蚌埠 233000
5. 长江水利委员会荆江水文水资源勘测局, 湖北荆州 434002
6. 南京大学历史学系, 江苏南京 210093
7. 广东广播电视大学文法系, 广东广州 510091

收稿日期:2011-07-22 修回日期:2011-10-22 出版日期:2012-07-20 发布日期:2012-07-20
作者简介:
作者简介：李枫（1969-）,女,广西陆川人,博士研究生,主要从事全球变化与第四纪环境考古研究。E-mail：fion12395@hotmail.com
基金资助:
国家自然科学基金项目（40971115）、教育部“985工程”专项南京大学研究生科研创新基金项目（2011CL11）、国家科技支撑计划项目（2010BAK67B02）、教育部高等学校博士学科点专项科研基金项目（20090091110036）、中国科学院地球环境研究所黄土与第四纪地质国家重点实验室开放基金项目（SKLLGG0817）、江苏高校优势学科建设工程基金项目资助

A High-resolution Study of Moisture Evolution in the Jianghan Plain Since 12.76 cal. ka B.P.

Feng LI¹(), Li WU¹, Cheng ZHU¹(), Wei SUN¹, Xiao-cui WANG¹, Hua-ping MENG², Hui LIU², Qi-lan GONG³, Guang-yao ZHU⁴, Feng-qin ZHOU⁵, Su-yuan LI⁶, Jie OUYANG⁷

1. School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing, Jiangsu 210013, China
2. Hubei Provincial Institute of Cultural Relics and Archaeology, Wuhan, Hubei 430077, China
3. Department of Geogrphy, National Kaoshiung Normal University,Kaoshiung, 80201 Taiwan, China
4. Human Literary Society Branch Department, Bengbu College, Bengbu, Anhui 233000, China
5. Jingjiang Institute of Hydrologic and Water Resource Survey, Changjiang River Water Resources Commission, Jingzhou, Hubei 434000, China
6. Department of History, Nanjing University, Nanjing, Jiangsu 210093, China
7. Guangdong Radio & TV University, Guangzhou, Guangdong 510091, China

Received:2011-07-22 Revised:2011-10-22 Online:2012-07-20 Published:2012-07-20

摘要/Abstract

摘要：

选择位于江汉平原的JZ-2010湖相沉积剖面为研究对象,利用AMS¹⁴C测年建立江汉平原12.76 cal. ka B.P.以来环境演变的时间序列。对湖相沉积物中元素Rb和Sr的差异分布、Rb/Sr值、Ti元素含量以及磁化率等多项环境代用指标的综合分析表明：江汉平原12.76 cal. ka B.P.以来环境干湿变化经历了晚冰期由偏干转向偏湿波动、全新世开始湿度增强、全新世中期偏湿到湿润再至干湿波动,全新世晚期至现代偏湿到偏干的过程。磁化率波动与江汉平原新石器时代各文化类型出现或转型相关。江汉平原环境干湿变化体现东亚季风环流影响,驱动机制主要是北半球夏季太阳辐射变化;还受到东北、北、西三面环山而东南面向夏季风倾斜开放的地势影响。

关键词: 江汉平原, Ti元素含量, Rb/Sr, 磁化率, 干湿变化

Abstract:

Six AMS radiocarbon ages combined with the concentration and distribution of element Rb, Sr and Ti, Rb/Sr ratio and magnetic susceptibility are utilized to reconstruct the moisture evolution in the Jianghan Plain during the last 12.76 ka. The multi-proxy integrated indicators of the regional moisture conditions turned from dry to wet after the Late Glacial and progressively became better and reached its optimum period until the mid-Holocene, however, punctuated by several humidity decrease phases. Begin with the severe dry event around 4.42-4.00 cal.kaBP, the environment was dry again in the Jianghan Plain as a whole. It can be inferred that the evolution of moisture condition in the study area was dominated by the East Asian monsoon system which likely be driven by the solar insolation changes on the Northern Hemisphere. As the first time to apply the Rb/Sr ratio and Ti concentration in tracing moisture evolution in a region with typical subtropical humid climate, this study highlights the different effects and consequences of the proxies throughout the paleoenvironment process. Also the regional characteristics of continuously subsided since the Cretaceous period as well as the topography opening down to southeast. What’s more the variations of magnetic susceptibility are well coincided with the transition of Neolithic culture of the Jianghan Plain.

Key words: Jianghan Plain, Ti concentration, Rb/Sr ratio, magnetic susceptibility, moisture evolution

中图分类号:

X144

李枫, 吴立, 朱诚, 孙伟, 王晓翠, 孟华平, 刘辉, 齐士峥, 龚琪岚, 朱光耀, 周凤琴, 李溯源, 欧阳杰. 江汉平原12.76 cal. ka B.P.以来环境干湿变化的高分辨率研究[J]. 地理科学, 2012, 32(7): 878-884.

Feng LI, Li WU, Cheng ZHU, Wei SUN, Xiao-cui WANG, Hua-ping MENG, Hui LIU, Qi-lan GONG, Guang-yao ZHU, Feng-qin ZHOU, Su-yuan LI, Jie OUYANG. A High-resolution Study of Moisture Evolution in the Jianghan Plain Since 12.76 cal. ka B.P.[J]. SCIENTIA GEOGRAPHICA SINICA, 2012, 32(7): 878-884.

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送样编号	样品性质	采样深度(cm)	测试编号	AMS¹⁴C年代 (a B.P.)	2σ校正年代	日历年代 (cal a B.P.)
JJ AMS¹⁴C-9	泥炭	231~232	GZ4100	1270±20	678AD(100%)775AD	1224
JJ AMS¹⁴C-8	泥炭	262~264	GZ4099	2405±20	539BC(98.1865%)401BC	2420
JJ AMS¹⁴C-6	泥炭	318~320	GZ4098	3185±20	1497BC(100%)1422BC	3410
JJ AMS¹⁴C-4	淤泥	395~397	GZ4096	4235±20	2903BC(85.9137%)2867BC	4835
JJ AMS¹⁴C-2	淤泥	435~437	GZ4095	4815±25	3588BC(67.242%)3528BC	5508
JJ AMS¹⁴C-1	淤泥	635~637	GZ4094	10870±35	10943BC(100%)10670BC	12757

剖面层号	深度（cm）	样品数	Ti（×10^-⁶）		Rb（×10^-⁶）		Sr（×10^-⁶）		Rb/Sr
剖面层号	深度（cm）	样品数	范围	均值	范围	均值	范围	均值	范围	均值
1	0~17	1	5507.14	5507.14	137.79	137.79	134.86	134.86	1.02	1.02
2	17~48	7	3983.31~5542.61	4789.88	74.70~128.03	107.59	131.53~161.91	145.69	0.46~0.97	0.75
3	48~67	7	5410.70~5723.84	5529.43	122.57~141.22	135.85	139.08~153.72	145.68	0.81~1.00	0.93
4	67~231	38	4916.00~6679.17	5540.96	120.89~210.20	152.86	114.16~177.70	141.60	0.69~1.73	1.11
5	231~334	53	4111.02~5872.10	5144.86	127.67~178.10	160.58	98.72~113.82	108.79	1.15~1.62	1.48
6	334~470	69	5408.69~6722.68	5870.51	141.44~184.43	161.18	94.44~125.25	106.99	1.13~1.76	1.52
7	470~637	84	4856.58~7998.21	6468.43	98.78-~151.88	125.34	95.91~130.63	113.43	0.76~1.52	1.12

江汉平原12.76 cal. ka B.P.以来环境干湿变化的高分辨率研究

A High-resolution Study of Moisture Evolution in the Jianghan Plain Since 12.76 cal. ka B.P.

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