沙漠沙地风沙与湖相沉积物粒度判别方法及环境指示意义  

Grain size discriminant method for eolian and lacustrine sediments of deserts and it’s environmental indication

作　　者：张娅璐 春喜[1,3] 周海军 张样洋 王晓珍 Zhang Yalu;Chun Xi;Zhou Haijun;Zhang Yangyang;Wang Xiaozhen(Inner Mongolia Laboratory of Wetland Eco-Environment System Repair Engineering,Inner Mongolia Normal University,Hohhot 010022,China;College of Geographical Science,Inner Mongolia Normal University,Hohhot 010022,China;Laboratory of Mongolian Plateau Environment and Global Change,Inner Mongolia Normal University,Hohhot 010022,China)

机构地区：[1]内蒙古师范大学内蒙古自治区湿地环境修复工程实验室,内蒙古呼和浩特010022 [2]内蒙古师范大学地理科学学院,内蒙古呼和浩特010022 [3]内蒙古师范大学内蒙古自治区蒙古高原环境与全球变化实验室,内蒙古呼和浩特010022

出　　处：《中国沙漠》2020年第5期1-9,共9页Journal of Desert Research

基　　金：国家自然科学基金项目(41662011,41967052);内蒙古自然科学基金项目(2019ZD10,2019GG020);研究生科研创新基金项目(CXJJS18097)。

摘　　要：沉积物粒度特征不仅能够指示沉积物的来源和迁移方式,还可以揭示沉积环境的区域差异性及形成机制的复杂性。使用粒度对数拟合方法初步区分风沙与湖相沉积物的特征,再以乌兰布和沙漠和浑善达克沙地的218个表层风沙沉积与湖相沉积样品作为训练样本,并用同一区域不同时段采集的186个表层风沙沉积与湖相沉积样品进行验证,建立了风沙沉积物与湖相沉积物的判别模型。结果表明:该模型能够很好地分辨风沙和湖相沉积物,准确率在90%以上。结合提取沉积物的动力组分,可指示风沙沉积和湖泊沉积以外的沉积环境。Sediment particle size characteristics not only indicate its source and migration mode,but also reveal the regional differences in the depositional environments and the complexity of the formation mechanism. In this paper,the characteristics of eolian and lacustrine sediments are preliminarily distinguished by lognormal-distribution fitting method. Then,in order to establish a discriminant model between aeolian and lacustrine sediments,218 aeolian and lacustrine sediment samples from the Ulan Buh Desert and the Otindag Sandy Land are used as training samples,and 186 aeolian and lacustrine sediment samples from the same places in different years are used as testing samples. The results show that the model is able to distinguish aeolian and lacustrine sediments with an accuracy of more than 90%. Combined with the method of extracting sedimentary dynamic components,it is possible to identify sedimentary environments other than aeolian and lacustrine. This is of great significance to the preliminary judgment of the provenance of desert sediments,and also is of great reference value to the study of environmental evolution and climate reconstruction.

关 键 词：粒度特征 判别模型 风沙沉积 湖相沉积 沉积环境 

分 类 号：P531[天文地球—古生物学与地层学]