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中国沙漠 ›› 2015, Vol. 35 ›› Issue (3): 610-615.DOI: 10.7522/j.issn.1000-694X.2014.00150

• 古气候与环境演变 • 上一篇    下一篇

湖北郧县辽瓦店黄土剖面风化特征及其对气候变化的响应

崔天宇, 庞奖励, 黄春长, 查小春, 周亚利, 吴帅虎, 杨建超   

  1. 陕西师范大学 旅游与环境学院, 陕西 西安 710062
  • 收稿日期:2014-08-19 修回日期:2014-10-09 出版日期:2015-05-20 发布日期:2015-05-20
  • 通讯作者: 庞奖励(Email:jlpang@snnu.edu.cn)
  • 作者简介:崔天宇(1991-), 男, 山东日照人, 硕士研究生, 研究方向为资源开发与环境演变。Email:1151998520@qq.com
  • 基金资助:

    国家自然科学基金项目(41271108,41371029);国家社会科学基金项目(14BZS070);中央高校基本科研业务费项目(GK201301003)

Pedogenic Characteristics of Liaowadian Holocene Loess Profile in the Upper Hanjiang River Valley of China and Its Response to Climate Change

Cui Tianyu, Pang Jiangli, Huang Chunchang, Zha Xiaochun, Zhou Yali, Wu Shuaihu, Yang Jianchao   

  1. College of Tourism and Environment, Shaanxi Normal University, Xi'an 710062, China
  • Received:2014-08-19 Revised:2014-10-09 Online:2015-05-20 Published:2015-05-20

摘要:

对湖北郧县辽瓦店剖面的沉积学特征及磁化率、粒度、Rb、Sr含量等理化指标进行了研究。结果表明:辽瓦店剖面自下而上具有马兰黄土(L1)-过渡层(Lt)-古土壤(S0)-全新世黄土(L0)-表土(TS)地层序列;不同地层单元的风化成壤差异明显,其成壤强弱顺序为古土壤S0成壤最强、全新世黄土L0和过渡层Lt次之、马兰黄土L1最弱。成壤强弱的变化揭示出该区晚更新世末期(11 500 a BP以前)气候干冷,全新世早期(11 500~8 500 a BP)气候处于晚更新世干冷向全新世中期暖湿的过渡阶段,全新世中期(8 500~3 100 a BP)气候最为温暖湿润,全新世晚期(3 100 a BP以来)气候转为干冷且逐渐恶化的变化过程。

关键词: 黄土-古土壤, 风化程度, 气候变化, 辽瓦店

Abstract:

The Liaowadian (LWD) profile in Yunxian, Hubei of China was surveyed in details. Investigations into this soil profile, including pedo-stratigraphy, chronology, were carried over the first river terrace of the upper Hanjiang River valley. Magnetic susceptibility, particle-size distribution, the contents of Rb and Sr were analyzed in laboratory. The result shows that LWD profile recorded the environment features and evolution with the stratigraphic series TS-L0-S0-Lt-L1. Different degree of weathering intensity in different stratigraphic units is paleosol S0 > Holocene loess L0 > modern TS>transitional loess layer Lt > Malan loess layer L1. The climate was dry and cold before 11 500 a BP and dust falls led to the formation of Malan loess layer L1. And between 11 500 a BP and 8 500 a BP, the climate got warmer, and was characterized by dry and wet, and dust falls led to the formation of Transitional loess layer Lt. During 8 500 a BP to 3 100 a BP, Yunxian basin experienced its warmest period with a warm and humid climate during Holocene, and dust falls led to the formation of S0. During the late Holocene, namely 3 100 a BP, the climate was deteriorating very quickly. It turned from warm to cold, and precipitation began to decline.

Key words: loess-paleosol sequence, weathering degree, climate change, Liaowadian

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