冬春季上风向表土与呼和浩特沙尘暴降尘的关系分析  

The relationship between upwind topsoil and the sandstorm dustfall in winter and spring in Hohhot

作　　者：李占宏[1] 海春兴[2] 刘广通[2] 

机构地区：[1]包头师范学院资源与环境学院,包头014030 [2]内蒙古师范大学地理科学学院,呼和浩特010022

出　　处：《干旱区资源与环境》2014年第12期71-75,共5页Journal of Arid Land Resources and Environment

基　　金：内蒙古自然科学基金项目(2010MS0616)资助

摘　　要：通过对呼和浩特市冬春季上风向的蒙古国及阴山北麓表土取样后与呼和浩特市沙尘暴降尘和非尘暴降尘进行对比分析,用原子吸收分光光度计测定了K2O、CaO、Na2O、MgO、Al2O3、SiO2、Fe2O3、Mn、Cu、Pb、As、Ti等化学成分,发现除非尘暴降尘样的氧化物常规成分为81%外,其它三种样品的氧化物常规成分均在83%-84%之间,总量相差不大,但具体成分差别较明显。通过富集系数法、判别函数法和硅铝率等计算分析了蒙古国与阴山北麓表土与呼和浩特沙尘暴降尘的关系。得出呼和浩特市沙尘暴降尘的化学成分更接近于阴山北麓表土,且沉积元素主要来自自然源,阴山北麓表土为呼和浩特市沙尘暴的重要尘源,蒙古国的半固定沙丘对呼和浩特市沙尘暴尘源贡献不明显。This research analyzed the winter- spring top soils of Mongolia and the northern foot of Yinshan Mountain in upwind of Hohhot and the sandstorm dustfall and nonsandstorm dustfall of Hohhot through determining K2 O,CaO,Na2 O,MgO,Al2O3,SiO2,Fe2O3,Mn,Cu,Pb,As,Ti and other chemical compositions by atomic absorption spectrophotometer. It was found that the percent of conventional oxide composition is 81% in addition to non sandstorm dustfall sample,the conventional oxide composition of other three kinds of samples are between 83% and 84%,though the total amount difference is not big,but the difference of the specific components is obvious. Calculating and analysis of the relationship between surface soil of Mongolia and the northern foot of Yinshan Mountain and the sandstorm dustfall of Hohhot by the enrichment coefficient method,the discriminated function method,the silica alumina ration and other methods draw the following conclusions： the chemical compositions of sandstorm dustfall in Hohhot are more closely related to the topsoil of the northern foot of Yinshan Mountain,and the deposited elements mainly come from natural sources. The topsoil of the northern foot of Yinshan Mountain is the main sandstorm dust sources for Hohhot,and the contribution of semi- fixed dunes in Mongolia to the sandstorm dust sources for Hohhot is not so obvious.

关 键 词：蒙古国 阴山北麓 表土 呼和浩特 沙尘暴 

分 类 号：P425.55[天文地球—大气科学及气象学]