影响中国黄土磁化率差异的多因素评述  

Evaluation of Multifactors that Affect the Susceptibility of China's Loess

作　　者：李志文[1] 李保生[1] 孙丽[1] 温小浩[1] 邱世藩[1] 吕映霞[1] 

机构地区：[1]华南师范大学地理科学学院,广东广州510631

出　　处：《中国沙漠》2008年第2期231-237,共7页Journal of Desert Research

基　　金：国家重点基础研究发展计划项目(2004CB720206);国家自然科学基金(40772118);中国科学院知识创新工程重要方向项目(KZCX2-SW-118)共同资助

摘　　要：通过查阅最近30a来对黄土古土壤磁化率与气候的关系等方面的研究结果,认为:成壤作用过程中由生物作用和风化作用产生的超顺磁粒级的磁铁矿、磁赤铁矿等强磁性矿物是导致古土壤磁化率增强的主要原因。另外,磁化率值高低也不容忽视其他因素的影响,如黄土古土壤本底值的区别、淋溶作用、有机质对磁性矿物老化的阻碍及其本身的磁化率等。因此,黄土古土壤磁化率的高低是在气候条件为主导的作用下多种因素参与的结果。Based on the last 30 years＇ research on the relationship between the susceptibility of loess-paleosol and climate,we tend to believe that the enhancement of paleosol＇s susceptibility mainly results from the ultrafine grains of magnetite and maghemite developed by biological and chemical weathering during the course of pedogenesis.Moreover,susceptibility is influenced by other factors,such as： the background value of loess-paleosol＇s susceptibility,eluviation,the magnetic minerals＇ aging delayed by organic matter and its own susceptibility.Consequently,the susceptibility of loess-paleosol is influenced by multi-factors,mainly by climatic conditions.

关 键 词：磁化率差异 多因素综合作用 黄土古土壤 

分 类 号：P532[天文地球—古生物学与地层学]