黄土高原及相邻地区表土磁化率与降水量的关系  

Relationship between the Magnetic Susceptibility of Surface Soil and Precipitation of Loess Plateau and Adjacent Area

作　　者：魏海涛[1] 夏敦胜[2] 陈发虎[1] 马剑英[2] 王冠[1] 

机构地区：[1]兰州大学西部环境教育部重点实验室,甘肃兰州730000 [2]中国科学院寒区旱区环境与工程研究所沙漠与沙漠化重点实验室,甘肃兰州730000

出　　处：《冰川冻土》2008年第3期433-439,共7页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(404010644067119590502008);科技部重点国际合作项目(2002CB714004)资助

摘　　要：在黄土高原-阿拉善高原区域沿年均降水量线最大梯度方向采集了61个表土样品,分析了其磁化率、粒度和有机碳含量等环境变化替代性指标的变化特征.结果表明:在母质类型多样和地貌特征差异较大的该广阔区域,频率磁化率与降水有良好的相关性,而常用的磁化率不能用作反映降水量变化的理想指标,与以往土壤磁学研究存在一定差异.研究结果指示,在干旱地区应用磁化率指标解释环境变化需要谨慎.Sixfy one surface soil samples collected along the direction of the maximum grads of the precipitation curve in the Loess Plateau and Alxa Plateau were analysed to reveal their characteristics of magnetic susceptibility, grain size and the LOI. The results indicate that, as compared to the common magnetic susceptibility, the frequency-dependent magnetic susceptibility shows a closer reationship with precipitation in the large complicated area with different basic substance and differentphysiognomy styles, which does not agree with the previous studies. The results demonstrate thatmore caution should be taken to explain the magnetic susceptibility data in environmental studies inthe arid regions.

关 键 词：环境磁学 降水量 表土 黄土高原 

分 类 号：P534.63[天文地球—第四纪地质学]