极端干旱区黄土土壤容重的测量及其古气候意义  

MEASUREMENT AND PALEOCLIMATIC SIGNIFICANCE OF SOIL BULK DENSITY FOR LOESS IN EXTREME ARID REGION

作　　者：昝金波[1,2] 杨胜利[2,3] 方小敏[1,2] 李香钰[2] 杨一博[2] 迟云平[1] 

机构地区：[1]兰州大学西部环境教育部重点实验室资源环境学院,兰州730000 [2]中国科学院青藏高原研究所盆地资源与环境研究中心,北京100085 [3]南京师范大学地理科学学院,南京210046

出　　处：《海洋地质与第四纪地质》2010年第2期127-132,共6页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金项目(40571171;40972122)

摘　　要：黄土和古土壤的容重,不仅可以反映东亚冬、夏季风强度的变化,而且还是计算粉尘沉积通量的基础,因此,在古气候研究以及亚洲内陆干旱化重建过程中具有重要的意义。目前,黄土土壤容重的研究大都集中在黄土高原地区,而作为黄土高原主要源区的中国西北内陆极端干旱区,关于土壤容重的测量方法以及古气候意义涉及的较少。在前人研究的基础上,提出了适合亚洲内陆极端干旱区黄土容重测量的理想方法,并发现该区的黄土容重值同粒度以及磁化率的变化均呈明显的负相关关系,这与黄土高原有很大的不同。进一步的分析表明,在极端干旱区,黄土容重的变化主要反映了源区干旱程度的变化,季风强度对容重的影响微弱。Soil bulk density of the loess-paleosol can not only reflect variations in strength of East Asian winter and summer monsoon,but also has important significance to study paleoclimate and reconstruct drying trend of Asian heartland.Now,most of researches on the soil bulk density concentrate their attention on Chinese Loess Plateau（CLP）,while in the arid regions of Northwest China there are relatively fewer researches on the methods and paleoclimatic significance of the soil bulk density.Based on previous studies,an ideal method for measurement of the soil bulk density in arid region of Asian heartland is put forward in this paper,and we also find the soil bulk density value in negative correlation with variations in the grain sizes and magnetic susceptibility（MS）,which is very different from that in Chinese Loess Plateau.Further analysis suggested that variations in the soil bulk density of extreme arid region loess was mainly controlled by the drought extent of source region,rather than monsoon intensity.

关 键 词：容重 极端干旱区 昆仑山黄土 

分 类 号：P532[天文地球—古生物学与地层学]