Holocene dust accumulation and the formation of polycyclic cinnamon soils (luvisols) in the Chinese Loess Plateau
Holocene dust accumulation and the formation of polycyclic cinnamon soils (luvisols) in the Chinese Loess Plateau
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DOI：
10.1002/esp.512
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发表时间：
2003-11
影响因子：
3.3
通讯作者：
C. Huang;J. Pang;Shu'e Chen;Zhan-he Zhang
中科院分区：
文献类型：
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作者：
C. Huang;J. Pang;Shu'e Chen;Zhan-he Zhang
中国黄土-古土壤序列以记录季风气候变化而闻名。然而，对灰尘积累和土壤形成的现代过程仍然知之甚少。对黄土高原南部周原黄土塬区现代土壤进行了高分辨率调查，包括磁化率、粒度分布、全铁、全有机碳、CaCO 3含量和光释光测年。结果表明，现代褐土（淋溶土）是在全新世风积尘的同时形成的。通过光释光测年和代用气候资料，在马兰黄土的顶部发现了新仙女木期堆积的风成黄土。这表明末次冰期（海洋同位素第2-4阶段）堆积的马兰黄土不是现代土壤的母质。早全新世以来，黄土塬区降水和土壤水分的增加是土壤成土作用的开始。降水驱动的成土作用和有机活动导致了CaCO 3的沥滤、矿物粉尘的分解以及粘土和铁磁性矿物的产生。干燥间隔多次中断土壤形成，因此在黄土台塬上的许多地点形成了多种土壤的剖面。在土壤侵蚀相对强烈的地方，全新世剖面中保存着单一土壤或焊接土壤。然而，这并不一定意味着高原上的现代土壤是在持续温暖、潮湿的气候下不间断地发育起来的。这对了解黄土高原第四纪众多古土壤形成过程中的地表过程和气候变化具有重要意义。版权所有© 2003年约翰威利父子有限公司。
Chinese loess–palaeosol sequences are well known for their records of monsoonal climatic variations. However, the modern processes of dust accumulation and soil formation remain poorly understood. A high‐resolution investigation on modern soils, including the measurement of magnetic susceptibility, particle‐size distribution, total Fe, total organic carbon, CaCO3 content, and optical stimulated luminescence (OSL) dating was carried out on the Zhouyuan loess tableland in the southern Loess Plateau. The results indicate that modern cinnamon soils (luvisols) have developed on contemporarily accumulated aeolian dust during the Holocene. The aeolian loess accumulated during the Younger Dryas was identified in the top part of the Malan Loess that underlay the modern soil by OSL dating and proxy climatic data. It indicates that the Malan Loess accumulated during the last glaciation (marine isotope stages 2–4) does not serve as the parent material for the modern soils. Pedogenesis of the soils started with the increased precipitation and soil moisture that have occurred on the loess tableland since the early Holocene. Precipitation‐driven pedogenesis and organic activities are responsible for the leaching of CaCO3, decomposition of mineral dust and the production of clay and ferromagnetic minerals. Drier intervals have interrupted soil formation several times, and therefore profiles with multiple soils have been developed at many sites on the loess tableland. At places where soil erosion was relatively strong, either a single soil or welded soils are preserved in the Holocene profiles. This does not necessarily mean, however, that modern soils over the plateau have been developed without interruption under a constantly warmer, moister climate. This is significant for understanding the surface processes and climatic variation during the formation of the numerous palaeosols over the Loess Plateau in the Quaternary. Copyright © 2003 John Wiley & Sons, Ltd.