Sand sheets-the major dust source in the western Lake Urmia playa-A comprehensive study of the soil-dust properties and stabilization  

作　　者：Nikou Hamzehpour Gholam Reza Mahdavinia Mehdi Rahmati 

机构地区：[1]Department of Soil Science and Engineering,Faculty of Agriculture,University of Maragheh,Maragheh,55181-83111,Iran [2]Department of Chemistry,Faculty of Science,University of Maragheh,Maragheh,55181-83111,Iran [3]Institute of Bio and Geosciences(IBG),Forschungszentrum Jülich,Jülich,52428,Germany

出　　处：《International Journal of Sediment Research》2024年第3期355-374,共20页国际泥沙研究（英文版）

基　　金：funded by Iran National Science Foundation(INSF),under project No.4005422.

摘　　要：Climate change accelerated by anthropogenic activities has led to the shrinkage and eventually disappearance of salt lakes all over the world.Gradual desiccation of Lake Urmia(LU)in northwestern Iran,as one example of desiccating lakes,has led to the exposure of the lakebed sediment with enormous dust emission potential in some parts.Sand sheets of western LU are identified as one of the major contributors to aerosols in this region.Yet,dust blown from this area is not well characterized.The aims of the current study were,therefore,to comprehensively investigate the origin of dust from sand sheets;the characteristics of dust and temporal variability of the aerosol and to test the effectiveness of the application of sodium alginate(SA)on soil crusting and stabilization.Soil samples were collected from the two prevailing soil types from sand sheets in August 2020.Dust samples were also collected during four time periods:July and August(the beginning of the dry season);October and November(the beginning of the wet season).Using SA with varying concentrations and different methods of application,the effectiveness of the induced crusts was investigated.Authigenic aragonite minerals with elongated needle shapes were found to be the major constituent of the soil and dust samples.Temporal variability of the dust characteristics and their elemental correlation to dust sources revealed that while dust source 1(DS_(1))with higher clay,salt,and silt contents contribute more to the dust composition from July to August(R^(2)>0.75 for DS_(1) versus R^(2)>0.58 for DS_(2)),dust source 2(DS_(2))with less salinity and higher sand content becomes the major contributor to dust composition from October to November(R^(2)>0.91 for DS_(2) versus R^(2)>0.75 for DS_(1)).Results of stabilizing both DS_(1) and DS_(2) showed that SA-induced crusts on DS_(1) are more stable than DS_(2) due to the presence of higher clay,silt,salt,organic matter,and lower aragonite minerals.SA-induced crusts by a compaction method significantly performed better

关 键 词：AEROSOLS ARAGONITE Crust stability Optimum moisture content X-ray fluorescence(XRF) 

分 类 号：X142[环境科学与工程—环境科学]