共和盆地马四剖面12 cal ka BP以来的成壤环境演变

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

摘要/Abstract

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

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

中图分类号:

P531

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.

Zhang Yayun, Hu Mengjun, Li Nana, Wang Jia, Li Chunyan. Holocene Environmental Change of Pedogenesis in the MS Profile of Gonghe Basin, China[J]. Journal of Desert Research, 2019, 39(6): 66-75.

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