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Characteristic of Paleosol on the Paleo-alluvial-pluvial Fans and Its Environmental Significance
Author(s): 
Pages: 332-336
Year: Issue:  2
Journal: ACTA SEDIMENTOLOGICA SINICA

Keyword:  全新世古土壤洪积扇临汾盆地;
Abstract: 通过对山西襄汾东坡沟全新世黄土剖面地层学和土壤学的研究,以及碳酸钙、铁和粒度的测定,发现全新世古土壤中碳酸钙经历了明显的淋溶与淀积,古土壤上部CaCO3平均含量10.58%,下部为18.47%,CaCO3结核的淀积深度约为1.1 m,铁在古土壤顶部有微弱的淋移和富集,粘化作用不明显.成壤作用始于全新世大暖期之初,较为强烈的成壤作用发生于大暖期的晚期(4100 aB.P~3100 aB.P),这一阶段土壤湿度大,气候波动小,CaCO3淋溶较强.大暖期结束后,冬季风在黄土高原占主导地位,土壤的淋溶作用和粘土作用均有一定程度减弱,显示气候干旱的趋势.该剖面位于古山前洪积扇前端,地形较高,降水易分散,淋溶作用总的说来不强烈,土壤上部CaCO3残留较多,CaCO3淀积深度较浅,土壤类型接近黑垆土.
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