- 责任者：Li Pingyuan (Key Laboratory of Western China’s Environmental Systems ; Ministry of Education ; Research School of Arid Environment ＆ Climate Change ; Lanzhou University ; Lanzhou 730000 ; China) ; Liu Xiuming
- 刊名：Quaternary Sciences
- 出版年：2013
- 卷期：33(2)
- 关键词：磁化率 ; magnetic susceptibility ; 黄土 ; loess ; 黄土高原 ; Loess Plateau
- 页码：p.360-367
- 图表：illus., 1 table, 44 refs.
- 分类号：1400
- issnNo：ISSN1001-7410
- isbnNo：CN11-2708/P
mal style="MARGIN: 0cm 0cm 0pt">man">The magnetic susceptibility variation of loess-paleosol sequences in Chinese Loess Plateau man’; mso-hansi-font-family: ’Times New Roman’">（man">CLPman’; mso-hansi-font-family: ’Times New Roman’">）man"> coincides with paleoclimatic changes and hence is widely used for climate reconstruction. Previous studies indicate the existence of a linear relationship between precipitation and magnetic susceptibility of topsoil, which is, however, speculated more complicated. Here we study topsoilman’; mso-hansi-font-family: ’Times New Roman’">（man"> 170 samples and together with other 61 publishedman’; mso-hansi-font-family: ’Times New Roman’">）man">including Gobi and CLP in northwest of China, spanning 96man’; mso-hansi-font-family: ’Times New Roman’">°man"> - 110man’; mso-hansi-font-family: ’Times New Roman’">°man">E ,33man’; mso-hansi-font-family: ’Times New Roman’">°man">N to 43man’; mso-hansi-font-family: ’Times New Roman’">°man">N, with precipitation 50 - 700mm/a. Low field magnetic susceptibility Elf and frequency dependent susceptibility man’; mso-hansi-font-family: ’Times New Roman’">（man">Xfa and Zfd% man’; mso-hansi-font-family: ’Times New Roman’">）man"> have been obtained using Bartington MS2. The precipitation,ranging from 1971 -2000,at each sample site is simulated and determined with GIS methods. The correlation between magnetic susceptibility and precipitation presented in this study indicates thatman’; mso-hansi-font-family: ’Times New Roman’">：man"> linear relationship between susceptibility and precipitation only occurs to a high precipitation larger than 200mm/a and 300mm/a. Below this threshold,the relationship is unintelligible. This relation boundary likely attributes to different pedogensis degree over this area. Superparamagnetic man’; mso-hansi-font-family: ’Times New Roman’">（man">SPman’; mso-hansi-font-family: ’Times New Roman’">）man">particles bearing very high susceptibility form during the strong pedognesis in humid area; while in arid area due to weak pedogenic process,the contribution of SP particles of pedogensis origin is limited.