基于绿洲尺度大气降尘粒度空间分异特征  

Spatial differentiation characteristics of aeolian deposit grain size at the oasis scale

作　　者：林永崇 穆桂金[2] 徐立帅[3,4] 陈丽玲 LIN Yongchong;MU Guijin;XU lishuai;CHEN Liling(School of History and Geography,Minnan Normal University,Zhangzhou 363500;State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011;College of Resources and Environment,Shanxi Agricultural University,Taigu 030801;Institute of Desert Meteorology,China Meteorological Administration,Urumqi 830002,China)

机构地区：[1]闽南师范大学历史地理学院,漳州363500 [2]中国科学院新疆生态与地理研究所荒漠与绿洲生态国家重点实验室,乌鲁木齐830011 [3]山西农业大学资源环境学院,太谷030801 [4]中国气象局乌鲁木齐沙漠气象研究所,乌鲁木齐830002

出　　处：《干旱区资源与环境》2021年第10期149-154,共6页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金青年基金项目(编号:41601012);福建省高校杰出青年科研人才培育计划;福建省教育厅中青年教师教育科研项目(编号:JAT190365);山西农业大学科技创新基金(编号:2016YJ16);中国沙漠气象科学研究基金(编号:Sqj2020011)资助。

摘　　要：大气沙尘传输过程中一般会沿着风向发生沉积分选,沉积物粒度特征将发生空间分异。而多大的空间尺度上才能显示出沉积分异作用目前还未被清楚地认识。通过对策勒绿洲两期大气降尘10个位置降尘粒度特征分析,试图揭示风成沉积粒度在绿洲尺度空间分异特征。结果显示:在绿洲尺度上各个采样点风成沉积粒径范围在0.4-250μm之间,都表现出双峰态粒度分布特征,主峰态众数集中在67-75μm,次峰态众数集中在15-24μm之间,两个子峰态粒度特征各自十分一致,都未在绿洲尺度上出现明显的空间分异。稳定一致的粒度特征指示其空间上经历一致的沉积分选作用,因此,风成沉积粒度特征是区域风场强度有效的环境代用指标。In the process of atmospheric dust transportation,sedimentary differentiation generally occurs along the wind direction,and the grain size characteristics of the sediment will be spatially differentiated.The spatial scale at which the sedimentary differentiation can be shown has not been clearly understood.This study attempts to reveal the characteristics of the spatial differentiation of aeolian deposits at the oasis scale by analyzing the grain size characteristics of the atmospheric dustfall at 10 locations in Cele Oasis.The results show that the grain size of aeolian deposits at each sampling point on the oasis scale ranges between 0.4 μm and 250 μm,all showing bimodal particle size distribution characteristics.The main peak mode is between 67 μm and 75 μm,and the secondary peak mode is between 15μm and 24 μm,the grain size characteristics of the two sub-peaks are very consistent,and there is no obvious spatial differentiation on the oasis scale.Stable and consistent grain size characteristics indicate that they have experienced consistent sedimentation sorting in space.Therefore,the grain size characteristics of aeolian sediments are the effective environmental proxy indexes for the intensity of regional wind fields.

关 键 词：风成沉积 粒度 空间分异 绿洲 

分 类 号：X51[环境科学与工程—环境工程]