MEASUREMENT AND PALEOCLIMATIC SIGNIFICANCE OF SOIL BULK DENSITY FOR LOESS IN EXTREME ARID REGION
-
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。Abstract: 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.
-
Key words:
- soil bulk density /
- extreme arid region /
- Kunlun Mountains Loess
-
-
[1] 安芷生,魏兰英.离石黄土中的第五层古土壤及其古气候意义[J].土壤学报,1980,17:1-10.[AN Zhisheng,WEI Lanying.The fifth layer paleosol in the Lishi loess and their paleoclimatic significance[J].Acta Pedologica Sinica,1980
,17:1-10.]
[2] 刘东生. 黄土与环境[M]. 北京:科学出版社, 1985.[LIU Tungsheng. Loess and the Environment[M]. Beijing:Science Press, 1985.]
[3] 肖华国,吴锡浩,蒋复初,等. 黄土与古土壤容重指标与季风气候变化关系的初步研究——以郑州邙山赵下峪剖面为例[J]. 地质力学学报, 1998,4(4):42-45.
[XIAO Huaguo, WU Xihao, JIANG Fuchu, et al. A preliminary study on the relation between volumetric weight of loess and paleosol and monsoon climate change[J]. Journal of Geomechanics, 1998, 4(4):42-45.]
[4] 孙有斌,安芷生,周杰,等. 浸油法测量黄土样品的容重及其意义[J]. 地质论评, 2000, 46(2):220-224.
[SUN Youbin, AN Zhisheng, ZHOU Jie, et al. Dry bulk density of loess samples measured by the oil soaked method[J]. Geological Review, 2000, 46(2):220-224.]
[5] Zhu R, Liu Q, Jackson M J. Paleoenvironmental significance of the magnetic fabrics in Chinese loess-paleosols since the last interglacial (<130 ka)[J].Earth and Planetary Science Letters, 2004, 221:55-69.
[6] 靳春胜,张立原,韩家懋, 等. 末次间冰期以来黄土古土壤容重特征[J]. 吉林大学学报:地球科学版,2008,38(5):801-805.
[JIN Chunsheng, ZHANG Liyuan, HAN Jiamao, et al. Characteristics of volumetric weight in loess-paleosols since the Last Interglacial[J]. Journal of Jilin University(Earth Science Edition),2008,38(5):801-805.]
[7] 靳春胜,黄孝刚,张立原,等. 六盘山东西两侧黄土古土壤容重的特征及其古气候指示意义[J].地质学报,2008,82(5):702-709.
[JIN Chunsheng, HUANG Xiaogang, ZHANG Liyuan, et al. Characteristics of loess-paleosols volumetric weight in the eastern and western Liupanshan and its paleoclimate significance[J]. Acta Geologica Sinica, 2008,82(5):702-709.]
[8] An Z S, Kukla G J, Porter S C,et al. Magnetic susceptibility evidence of monsoon variation on the Loess Plateau of Central China during the last 130000 years[J]. Quaternary Research, 1991, 36:29-36.
[9] 安芷生,肖举乐. 黄土高原风尘沉积通量研究的一个实例[J]. 科学通报, 1990,35(3):220-223.
[AN Zhisheng, XIAO Jule. A study example of the dust depositional flux of the Loess Plateau[J]. Chinese Science Bulletin, 1990, 35(3):220-223.]
[10] 孙有斌,安芷生. 最近7 Ma黄土高原风尘通量记录的亚洲内陆干旱化的历史和变率[J]. 中国科学D辑,2001,31(9):769-776.
[SUN Youbin, AN Zhisheng. History and variability of Asian interior aridity recorded by eolian flux in the Chinese Loess Plateau during the past 7 Ma[J]. Science in China (Series D), 2001, 31(9):769-776.]
[11] Fang X M, L L Q, Yang S L, et al. Loess in Kunlun Mountains and its implications on desert development and Tibetan Plateau uplift in west China[J]. Science in China (Series D), 2002, 45:289-299.
[12] Wang E, Wan J L, Liu J Q. Late Cenozoic geological evolution of the foreland basin bordering the West Kunlun range in Pulu area:Constraints on timing of uplift of northern margin of the Tibetan Plateau[J]. Journal of Geophysical Research, 2003, 108:2401-2412.
[13] 昝金波,杨胜利,方小敏,等.西昆仑山黄土的岩石磁学特征及其磁化率增强机制[J]. 第四纪研究, 2010,30(1):46-53.
[ZAN Jinbo, YANG Shengli,FANG Xiaomin, et al. Rock-magnetic characteristics and the enhancing mechanism of magnetic susceptibility for west Kunlun Mountains loess[J]. Quaternary Sciences, 2010,30(1):46-53.]
[14] Ding Z L, Derbyshire E, Yang S L, et al. Stepwise expansion of desert environment across northern China in the past 3.5 Ma and implications for monsoon evolution[J]. Earth and Planetary Science Letters, 2005, 237:45-55.
-
计量
- 文章访问数: 1365
- PDF下载数: 1
- 施引文献: 0
下载: