CAJ | 학술논문

利用建立在腾格里沙漠东南缘的中国科学院风沙观测场内收集的降尘,分析了不同降尘收集方法收集的降尘粒度、化学元素含量、富集因子、硅铝率和硅铝铁率,旨在优化干旱区降尘收集方法、确定我国的沙尘源区.降尘物质的微量元素Ba的含量最大,可达255~474μg/g, Nd的含量为0.3~9.6μg/g；常量元素SiO2的含量最大,79.30%, MgO含量最小,0.98%.微量元素的富集因子值在0~3之间,但常量元素差异较大.结果表明,减速法和湿法收集的降尘从粒度分布、化学元素含量、富集因子、硅铝率和硅铝铁率等方面均具有一致性.平均粒径湿法最细(Φ值2.84),干法最粗(Φ值2.46).因此,减速法能够作为代替湿法在干旱区进行收集降尘的方法.同时,由降尘的地球化学性质可知,西北干旱区沙漠是我国的主要沙尘源区之一.
이용건립재등격리사막동남연적중국과학원풍사관측장내수집적강진,분석료불동강진수집방법수집적강진립도、화학원소함량、부집인자、규려솔화규려철솔,지재우화간한구강진수집방법、학정아국적사진원구.강진물질적미량원소Ba적함량최대,가체255~474μg/g, Nd적함량위0.3~9.6μg/g；상량원소SiO2적함량최대,79.30%, MgO함량최소,0.98%.미량원소적부집인자치재0~3지간,단상량원소차이교대.결과표명,감속법화습법수집적강진종립도분포、화학원소함량、부집인자、규려솔화규려철솔등방면균구유일치성.평균립경습법최세(Φ치2.84),간법최조(Φ치2.46).인차,감속법능구작위대체습법재간한구진행수집강진적방법.동시,유강진적지구화학성질가지,서북간한구사막시아국적주요사진원구지일.
Using dust material collected in the Shapotou Aeolian Experiment Site in the southeastern part of the Tengger Desert, the dust particle sizes, chemical element composition, chemical enrichment factor, and Si/Al and Si/Al Fe ratios were analyzed. The aims of the study was to provide optimizational dust collection methods and confirm the dust sources. The content of the Ba was largest and was about 255~474μg/g, Nd was smallest and was about 0.3~9.6μg/g;the content of the SiO2 was largest and was about 79.30%, and MgO was smallest and was 0.98%. The enrichment factors was between 0 and 3. The results indicated that the reduction velocity method and wet method caused similar changes to all studied parameters. The mean grain size was finest (Φwas 2.84) for the wet method and coarsest (Φwas 2.46) for the dry method. The reduction velocity method could be used to substitute for wet dust collection method for dust collection in dry regions. Based on chemical characteristics of the dust material, desert regions in northwestern China were the main dust sources.