共和盆地马四剖面12 cal ka BP以来的成壤环境演变

张亚云; 胡梦珺; 李娜娜; 王佳; 李春艳

doi:10.7522/j.issn.1000-694X.2018.00146

中国沙漠 >

2019 , Vol. 39 >Issue 6: 66 - 75

DOI: https://doi.org/10.7522/j.issn.1000-694X.2018.00146

共和盆地马四剖面12 cal ka BP以来的成壤环境演变

张亚云 ,
胡梦珺 ,
李娜娜 ,
王佳 ,
李春艳

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西北师范大学地理与环境科学学院, 甘肃兰州 730070

张亚云(1993-),女,甘肃宁县人,硕士研究生,主要从事环境演变与沙漠化防治。E-mail:m15709483307@163.com

收稿日期: 2018-09-21

修回日期: 2018-12-04

网络出版日期: 2019-11-14

基金资助

国家自然科学基金项目（41171018，41161036）

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Holocene Environmental Change of Pedogenesis in the MS Profile of Gonghe Basin, China

Zhang Yayun ,
Hu Mengjun ,
Li Nana ,
Wang Jia ,
Li Chunyan

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College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China

Received date: 2018-09-21

Revised date: 2018-12-04

Online published: 2019-11-14

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摘要

在分析常量元素氧化物含量及其比值的基础上，结合¹⁴C测年，对共和盆地马四剖面风成沉积序列进行研究，重建了12 cal ka BP以来共和盆地成壤环境演变过程。结果表明：（1）剖面常量元素氧化物以SiO₂、Al₂O₃为主，元素含量SiO₂ > Al₂O₃ > Fe₂O₃ > MgO > CaO > Na₂O > K₂O；（2）12 cal ka BP以来区域成壤环境大致经历了凉干-温润-冷干-凉润-凉干-温湿-凉干7个阶段，即11.98 cal ka BP以前区域气候凉干，风沙活动频繁，成壤作用较弱；11.98~9.75 cal ka BP气候温润，但波动频繁，成壤环境不稳定；9.75~8.09 cal ka BP气候冷干，风沙活动强，成壤作用最弱；8.09~4.78 cal ka BP气候适宜，成壤作用强；4.78~2.90 cal ka BP气候凉干，成壤环境较弱；2.90~0.67 cal ka BP气候转暖期，气候温湿，成壤作用达到最强；0.67 cal ka BP至今气候凉干，成壤作用较弱。

关键词： 常量元素; 迁移率; 成壤环境; 共和盆地

本文引用格式

张亚云 , 胡梦珺 , 李娜娜 , 王佳 , 李春艳 . 共和盆地马四剖面12 cal ka BP以来的成壤环境演变[J]. 中国沙漠, 2019 , 39(6) : 66 -75 . DOI: 10.7522/j.issn.1000-694X.2018.00146

Abstract

The paper based on the environmental characteristics revealed by concent-ration of constant element oxides and ratio, and combined with ¹⁴C dating, researching the aeolian sedimentary sequence of desertified land in the MS profile of Gonghe Basin, and rebuilt the sedimentary environmental evolution process of Gonghe since 1.2×10⁴ cal BP. The research result shows that SiO₂、Al₂O₃ is the main element oxide in the profile, and the order of element content is SiO₂ > Al₂O₃ > Fe₂O₃ > MgO > CaO > Na₂O > K₂O. The ration of the constant element oxides indicated that the climate of the Gonghe Basin had changed in temperature cycle from cool-dry-warm-humid-cool-dry-cool-humid-warm-cool-warm-moisture-cool-dry since 1.2×10⁴ cal BP. Based on the environmental characteristics revealed by concent-ration of constant element oxides and ratio sand combined with ¹⁴C dating, the environmental evolution in the MS profile since 1.2×10⁴ cal BP can be divided into seven stages. Before 1.198×10⁴ cal BP, the climate has become cool-dry with strong winds prompted intense aeolian activities so the Gonghe Basin had experienced a strong sandstorm activity period with weak pedogenesis; The climate trended to be warm with frequently climatic fluctuations and the pedogenesis instability in 11.98×10³-9.75×10³ cal BP; From 9.75×10³ cal BP to 8.09×10³ cal BP, cool and dry, the activity of sandstorm was strong and the role of forming soil was the weakest; During 8.09×10³-4.78×10³ cal BP, the climate was suitable and the pedogenesis was stronger; From 4.78×10³ cal BP to 2.90×10³ cal BP, cool and dry, the role of forming soil was weak; The climate was warm and wet, and the pedogenesis was the strongest and accompanying with prominently developed paleosol in 2.90×10³-0.67×10³ cal BP; The climate of 6.7×10 cal ka BP was cold and dry, and the role of forming soil was poor.

Key words： constant elements; mobility ratio; pedogenic environment; Gonghe Basin

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