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Characteristics of the fifth paleosol complex (S-5) in the southernmost part of the Chinese Loess Plateau and its paleo-environmental significance

文献类型： 外文期刊

作者： Huang, Chuan-Qin 1 ; Tan, Wen-Feng 1 ; Wang, Ming-Kuang 4 ; Koopal, Luuk K. 5 ;

作者机构： 1.Chinese Acad Sci, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China

2.Minist Water Resources, Yangling 712100, Shaanxi, Peoples R China

3.Huazhong Agr Univ, Minist Agr, Key Lab Arable Land Conservat Middle & Lower Reac, Wuhan 430070, Hubei, Peoples R China

4.Fujian Acad Agr Sci, Fuzhou 350003, Peoples R China

5.Wageningen Univ, Lab Phys Chem & Colloid Sci, NL-6703 HB Wageningen, Netherlands

关键词： Chinese Loess Plateau;Clay mineral weathering;Paleosol;Pedogenesis;Pedogenic environment

期刊名称：CATENA （ 影响因子：5.198； 五年影响因子：5.594 ）

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收录情况： SCI

摘要： The most prominent paleosol unit in the Chinese Loess Plateau (CLP) is the fifth paleosol complex (S-5) with its well-developed very thick and dark colored pedons. To provide more insight in the formation of S-5 and its environmental significance, the pedogenesis and clay mineral transformation in the S-5 of the Wugong section (Shaanxi Province) on the southernmost CLP are analyzed. S-5 at the Wugong section is essentially composed of three well-developed reddish pedons (i.e., S5-1, S5-2, S5-3) which signify three glacial-interglacial climatic fluctuations during its formation. Complete decalcification in each pedon and a calcic horizon of only 30-50 cm in thickness beneath each of the three pedons suggests that after deposition the pedons developed with a relatively stable surface in a sustained warm and humid climate. Clay formation in the S-5 includes neogenesis of clay materials by in situ post-depositional weathering and mechanical migration of the fine fraction after complete decalcification. Complete leaching of CaCO3, intensive clay formation (with 60-100% higher clay content than that in the overlying and underlying loess (L-5 and L-6)) and extremely high magnetic susceptibility in the S-5 pedons reflected a warmer, more humid climate and soil environment for pedogenesis than in the 'optimum' Holocene. However, the chemical alteration of the phyllosilicate minerals was weak and restrained by the hard calcic horizon, the compact argillic horizon and the flat terrain. The major clay mineral weathering processes during the formation of the S-5 pedons at the Wugong section were depotassication, hydrolysis of primary minerals and degradation of chlorite. The pedogenesis in a loess-paleosol sequence and its pedogenic environment can best be deduced from combined data on pedogenic properties, and geochemical and mineralogical characteristics

  • 相关文献

[1]Mineralogical and pedogenetic evidence for palaeoenvironmental variations during the Holocene on the Loess Plateau, China. Huang, Chuan-Qin,Zhao, Wei,Tan, Wen-Feng,Huang, Chuan-Qin,Zhao, Wei,Tan, Wen-Feng,Huang, Chuan-Qin,Li, Feng-Yi,Tan, Wen-Feng,Huang, Chuan-Qin,Wang, Ming-Kuang. 2012

[2]Physicochemical and biological interfacial interactions: impacts on soil ecosystem and biodiversity. Huang, Pan Ming,Wang, Shan-Li,Wang, Ming Kuang,Tzou, Yu-Min,Huang, Yibin,Weng, Boqi,Zhuang, Shunyao. 2013

[3]Soil inorganic carbon stock under different soil types and land uses on the Loess Plateau region of China. Tan, Wen-Feng,Zhang, Rui,Cao, Hua,Huang, Chuan-Qin,Yang, Qin-Ke,Tan, Wen-Feng,Zhang, Rui,Cao, Hua,Huang, Chuan-Qin,Yang, Qin-Ke,Tan, Wen-Feng,Koopal, Luuk K.,Wang, Ming-Kuang,Koopal, Luuk K..

[4]Hydroxy-interlayered minerals in the Holocene paleosol on the southernmost Loess Plateau, China. Huang, Chuan-Qin,Wang, Mi-Nan,Tan, Wen-Feng,Huang, Chuan-Qin,Tan, Wen-Feng,Wang, Ming-Kuang,Koopal, Luuk K.. 2018

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