李拓宇^1,,
任小林²,
廖奕楠³,
莫多闻³,
鄂崇毅⁴,
鲁鹏⁵,
许俊杰⁶,
伍永秋⁷,
杜世松⁷
1. 首都师范大学学报编辑部, 北京 100048
2. 中国科学院地质与地球物理研究所, 中国科学院新生代地质与环境重点实验室, 北京 100029
3. 北京大学城市与环境学院, 北京 100871
4. 青海师范大学地理科学学院, 青海省自然地理与环境过程重点实验室, 青海 西宁 810016
5. 河南省科学院地理研究所, 河南 郑州 450052
6. 郑州大学历史学院, 河南 郑州 450001
7. 北京师范大学地表过程与资源生态国家重点实验室, 北京 100875

基金项目: 国家自然科学基金项目（批准号：41601191）、国家重点基础研究发展计划项目（批准号：2013CB956001）、国家社科基金重大项目（批准号：11 & ZD183）和河南省特聘研究员项目共同资助


详细信息

作者简介: 李拓宇, 女, 35岁, 副编审, 环境考古研究, E-mail:lituoyu@cnu.edu.cn

中图分类号: P92;K872

收稿日期:2019-10-17
修回日期:2019-12-29
刊出日期:2020-03-30

Paleoenvironment analysis of the middle reaches of Yarlung Zangbo River and Changguogou site

Li Tuoyu^1,,
Ren Xiaolin²,
Liao Yinan³,
Mo Duowen³,
E Chongyi⁴,
Lu Peng⁵,
Xu Junjie⁶,
Wu Yongqiu⁷,
Du Shisong⁷
1. Editorial Department of Journal of Capital Normal University, Beijing 100048
2. Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029
3. College of Urban and Environmental Sciences, Peking University, Beijing 100871
4. Qinghai Provincial Key Laboratory of Physical Geography and Environmental Processes, School of Geography Sciences, Qinghai Normal University, Xining 810008, Qinghai
5. Institute of Geographical Science, Henan Academy of Sciences, Zhengzhou 450052, Henan
6. School of History, Zhengzhou University, Zhengzhou 450001, Henan
7. State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875


MSC: P92;K872

--> Received Date: 17 October 2019
Revised Date: 29 December 2019
Publish Date: 30 March 2020


摘要
摘要:西藏拉萨昌果沟遗址位于雅鲁藏布江中游支流的阶地上，是重要的新石器时代遗址。为探讨昌果沟遗址附近的古环境，对遗址附近开展地貌调查，在遗址北面约1 km处选取1个全新世风成沉积剖面进行光释光测年和环境指标分析，在雅鲁藏布江中游选2个阶地剖面进行光释光测年分析；此外，还总结了雅鲁藏布江中游23个全新世古土壤/泥炭的测年数据，进行概率密度分析，试图揭示区域的环境演化特征。研究表明：全新世古土壤/泥炭年代的概率密度可以较好地反映区域气候变化，9.0~6.0 ka古土壤/泥炭发育在波动中增强，气候由冷干向暖湿转换；6.0~2.9 ka古土壤/泥炭发育最强，气候相对温干；2.9 ka后鲜有古土壤/泥炭发育，气候变得冷干，史前人类活动受限。4.5 ka之后雅鲁藏布江中游及其支流一级阶地的形成为新石器时期先民提供农业耕作的场所，古土壤的发育为农作物提供了丰富的营养。1.4~1.1 ka期间（吐蕃王朝时期）局部地区有古土壤发育，气候好转。
关键词: 雅鲁藏布江/
昌果沟遗址/
阶地/
概率密度函数/
古环境

Abstract:Changguogou site(3200 a B.P.), an important Neolithic site, is located in south of Lhasa(Tibet). The site is located on a terrace of the Changguogou tributary in the middle reaches of the Yarlung Zangbo River. The site and its surroundings are covered with shifting sand. In order to explore the paleoenvironment of the Changguogou site and its surrounding area, this paper carried out geomorphic investigation around the site and the valley in the middle reaches of the Yarlung Zangbo River. CGG aeolian sedimentary profile(29°21'55.2"N, 91°08'56.7"E; 3666 m a.s.l.) located ca. 1 km north of the site was selected for optically stimulated luminescence(OSL)dating and environmental proxy analysis. JDX profile(29°17'08.8"N, 91°09'13.1"E; 3570 m a.s.l.) and ZXT profile(28°59'38.3"N, 93°16'29.8"E; 3054 m a.s.l.) from terrace in the middle reaches of the Yarlung Zangbo River were selected for OSL dating. In addition, 23 dates from Holocene paleosol/peat layers in the middle reaches of the Yarlung Zangbo River were summarized, and the probability density analysis was conducted to reveal the regional climate evolution.
Our results show that, the probability density of Holocene paleosol/peat dates can well reflect regional climate change. From 9.0~6.0 ka, the development of paleosol/peat was mainly in a fluctuating growth trend, indicating that the climate turned to warm and wet; from 6.0~2.9 ka, paleosols' development reached its peak and the climate was relatively warm and dry; after 2.9 ka, the climate became drier and colder, the development of paleosols weakened and the prehistoric human activities were limited.
The OSL dating results of three profiles and environmental proxy analysis of CGG profile showed, the first terrace of the middle reaches of Yarlung Zangbo River and its tributary was formed after 4.5 ka, which could provide an ideal place for the agricultural activities of the Neolithic ancestors, and develop paleosols provided suitable nutrition for crops. Paleosol developed at some places during the Tubo Dynasty period(1.4~1.1 ka), when the climate improved.
Key words:the Yarlung Zangbo River/
Changguogou site/
terrace/
probability density/
paleoenvironment



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