淮河上游全新世风成黄土与成壤环境变化研究

doi:10.13826/j.cnki.cn65-1103/x.2007.03.014

摘要/Abstract

摘要： 在野外考察研究的基础上,在河南禹州全新世黄土-古土壤剖面系统采样,利用X-荧光光谱仪测定了常量元素的含量,并与磁化率、粘粒含量及碳酸钙含量变化曲线对比发现:常量元素氧化物(Al2O3、Fe2O3、K2O、MgO)含量随土壤地层呈现有规律变化,即在古土壤层(S0)中含量最高,表土层(MS)中次之,在黄土层(L1、Lt、L0)中最低;Na2O在古土壤层淋失,在黄土层相对富集。深入分析表明,淮河上游全新世黄土为风力沉积物,来源于黄河下游泛滥平原的风沙活动和沙尘暴沉积。在古土壤层和表土层形成时期,气候温暖湿润,虽然仍然有沙尘暴发生,但是成壤作用和次生粘化作用较强;在黄土层堆积时期,气候干旱寒冷,黄河下游泛滥平原植被稀疏,风沙活动和沙尘暴强烈,风化成壤作用极其微弱。这些化学成分含量与磁化率相关性很强,表明它们主要受全新世气候与成壤环境变化的控制。

关键词: 黄土, 古土壤, 氧化物, 磁化率, 全新世, 淮河上游

Abstract: On the basis of field exploration and research, the content and changes of constant element oxides have been measured by XRF at the YPC loess-paleosol profile. Yuzhou County, Henan Province Comparing with magnetic susceptibility, the content of clay grain and $\mathrm{CaCO_3}$ , we found that the content of $\mathrm{Al_2O_3}$ , $\mathrm{Fe_2O_3}$ , $\mathrm{K_2O}$ and $\mathrm{MgO}$ varied regularly in the Holocene Aeolian loess-paleosol profile that is the content of these oxides reached the highest in the paleosol $(S_0)$ , moderate in the topsoil (MS), and the lowest in the loess $(L_{1}, L_{t}, L_{0})$ . $\mathrm{Na_2O}$ eluvia ted in the paleosol but congregated relatively in the loess The content of these oxides correlated with magnetic suscepibility remarkably, which showed that the transference of these constant elements was controlled mainly by the Holocene climate. Deep analysis showed that the Holocene loess in the upper reaches of Huaihe River was windblown dust sediment which came from the Yellow River abundant alluvial deposition and then reconstructed by Aeolian sand and dust storms aggradations It indicated that the climate was warm and humid in the stage of the paleeosol and the modem topsoil formation, the pedogenesis and secondary argillification was stronger although dust storms still occurred occasionally. In the stage of the loess accumulation, the climate was arid and cold, the vegetation was sparse in the lower-reaches of Yellow River abundant plain, the intensity of wind power and dust-fall was stronger so the efflorescent pedogenic effect was exceedingly weak. The above revealed the Holocene pedogenic environmental change in the upper reaches of the Huaihe River. The results would help to understand the regional response to global change in the upper reaches of the Huaihe River in semi-hum id zone

Key words: loess, paleosol, oxide, magnetic susceptibility, Holocene, upper reaches of Huaihe River

中图分类号:

P642.1

李新艳, 黄春长, 庞奖励, 王利军, 何忠. 淮河上游全新世风成黄土与成壤环境变化研究[J]. 干旱区地理, 2007, 30(3): 392-399.

LIXin-yan, HUANG Chun-chang, PANG Jiang-li, WANG Li-jun, HE Zhong. Holocene aeolian loess and pedogenic environmental change in the upper-reaches of the Huaihe River[J]. Arid Land Geography, 2007, 30(3): 392-399.

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