青藏高原东部表土磁化率特征与环境意义

doi:10.7522/j.issn.1000-0240.2018.0507

摘要/Abstract

摘要： 现代表土磁化率与气候因子关系的研究是黄土古气候重建的重要内容，在黄土高原地区取得了重要进展，但在青藏高原地区相对不足。在青藏高原东部系统采集了106个表土样品，分析了其磁化率的变化特征；并通过表土磁化率与气候因子的相关分析，讨论了气候因子对高原东部现代表土低频磁化率和频率磁化率的影响。结果表明：研究区表土磁化率特征主要受到温度和降水量的影响，水热组合差异影响表土磁化率值的高低。低频磁化率与气候因子的相关性较弱，总体上与温度的相关性优于降水量，可能表明其与气候因子的关系比较复杂；频率磁化率百分比与降水呈较好的正相关关系，表明该指标对降水量的变化更为敏感，可以用于青藏高原东部的古降水定量重建。

关键词: 青藏高原东部, 表土, 磁化率, 环境意义

Abstract: The relationship between magnetic susceptibility (MS) and climatic factors in modern topsoil is of great importance for regional magnetic enhancement mechanisms and paleoclimate reconstruction, which has had significant advancement in the Loess Plateau but not in the Tibetan Plateau. 106 samples of topsoil have been collected in the eastern Tibetan Plateau and variations of their MS have been analyzed by using Bartington Instruments MS2 Magnetic Susceptibility Meter. In addition, the effects of climatic factors on the low-frequency magnetic susceptibility (χ_lf) and frequency-dependent magnetic susceptibility (χ_fd) of modern topsoil in the eastern plateau were discussed based on the correlations between surface magnetic susceptibility and climatic factors. Climate data of topsoil were calculated by ARCGIS-interpolation of the mean annual temperature (MAT) and precipitation (MAP) from 1981 through 2010 from 274 meteorological stations. The results showed that MS of topsoil in the study area is mainly depended on temperature and precipitation, as well as the difference in hydrothermal composition which affected the MS value of topsoil. χ_lf has a little relation with climatic factors also. In addition, the correlation of χ_lf with temperature is better than that with precipitation. χ_fd is more sensitive to the change of precipitation and has a positive correlation with precipitation. This has clear indication significance and can be used for quantitative reconstruction of paleo-precipitation in the eastern part of the Tibetan Plateau.

Key words: Tibetan Plateau, topsoil, magnetic susceptibility, environmental significance

中图分类号:

P318.4+4

陈慧, 杨胜利, 成婷, 刘楠楠, 李帅, 梁敏豪, 唐国乾. 青藏高原东部表土磁化率特征与环境意义[J]. 冰川冻土, 2018, 40(6): 1187-1194.

CHEN Hui, YANG Shengli, CHENG Ting, LIU Nannan, LI Shuai, LIANG Minhao, TANG Guoqian. The magnetic susceptibility of top soil in the eastern Tibetan Plateau: features and environmental implications[J]. Journal of Glaciology and Geocryology, 2018, 40(6): 1187-1194.

参考文献

[1] Zhou Liping, Oldfield F, Wintle A G, et al. Partly pedogenic origin of magnetic variations in Chinese loess[J]. Nature, 1990, 346(6286):737.
[2] Xia Dunsheng, Jiajia, Wei Haitao, et al. Magnetic properties of surface soils in the Chinese Loess Plateau and the adjacent Gobi areas, and their implication for climatic studies[J]. Journal of arid environments, 2012, 78:73-79.
[3] Liu Qingsong, Deng Chenglong. Magnetic susceptibility and its environmental significances[J]. Chinese Journal of Geophysics, 2009, 52(4):1041-1048.[刘青松, 邓成龙. 磁化率及其环境意义[J]. 地球物理学报, 2009, 52(4):1041-1048.]
[4] Li Zhiwen, Li Baosheng, Sun Li, et al. Evaluation of multifactors that affect the susceptibility of China loess[J]. Journal of Desert Research, 2008, 28(2):231-237.[李志文, 李保生, 孙丽, 等. 影响中国黄土磁化率差异的多因素评述[J]. 中国沙漠, 2008, 28(2):231-237.]
[5] Deng Chenglong, Liu Qingsong, Pan Yongxin, et al. Environmental magnetism of Chinese loess-paleosol sequences[J]. Quaternary Sciences, 2007, 27(2):193-209.[邓成龙, 刘青松, 潘永信, 等. 中国黄土环境磁学[J]. 第四纪研究, 2007, 27(2):193-209.]
[6] Xia Dunsheng, Chen Fahu, Ma Jianying, et al. magnetic characteristics of loess in the Ili area and their environmental implication[J]. Quaternary Sciences, 2010, 30(5):902-910.[夏敦胜, 陈发虎, 马剑英, 等. 新疆伊犁地区典型黄土磁学特征及其环境意义初探[J]. 第四纪研究, 2010, 30(5):902-910.]
[7] Maher B A, Thompson R. Paleorainfall reconstructions from pedogenic magnetic susceptibility variations in the Chinese loess and paleosols[J]. Quaternary Research, 1995, 44(3):383-391.
[8] Lü Houyuan, Han Jiamao, Wu Naiqin, et al. The analysis of modern soil magnetic susceptibility and its paleoclimate significance[J]. Science in china, 1994, 24(12):1290-1297.[吕厚远, 韩家懋, 吴乃琴, 等.中国现代土壤磁化率分析及其古气候意义[J]. 中国科学(B辑化学生命科学地学), 1994(12):1290-1297.]
[9] Balsam W L, Ellwood B B, Ji Junfeng, et al. Magnetic susceptibility as a proxy for rainfall:worldwide data from tropical and temperate climate[J]. Quaternary Science Reviews, 2011, 30(19/20):2732-2744.
[10] Nie Junsheng, Stevens T, Song Yougui, et al. Pacific freshening drives Pliocene cooling and Asian monsoon intensification[J]. Scientific Reports, 2014, 4:5474.
[11] Liu Zhifeng, Liu Qingsong, Torrent J, et al. Testing the magnetic proxy χ_FD/HIRM for quantifying paleoprecipitation in modern soil profiles from Shaanxi Province, China[J]. Global and Planetary Change, 2013, 110:368-378.
[12] Liu Zhifeng, Wei Guangjian, Wang Xisheng, et al. Quantifying paleoprecipitation of the Luochuan and Sanmenxia loess on the Chinese Loess Plateau[J]. Palaeogeography, Palaeoclimatology, Palaeoecology, 2016, 459:121-130.
[13] Liu Xiaokang, Lu Ruijie, Lu Zhiqiang, et al. Magnetic susceptibility of surface soils in the Mu Us Desert and its environmental significance[J]. Aeolian Research, 2017, 25:127-134.
[14] Maher B A. Magnetic properties of modern soils and Quaternary loessic paleosols:paleoclimatic implications[J]. Palaeogeography, Palaeoclimatology, Palaeoecology, 1998, 137(1/2):25-54.
[15] Kukla G, Heller F, Liu Xiuming, et al. Pleistocene climates in China dated by magnetic susceptibility[J]. Geology, 1988, 16(9):811-814.
[16] Maher B A, Thompson R. Mineral magnetic record of the Chinese loess and paleosols[J]. Geology, 1991, 19(1):3-6.
[17] Maher B A, Thompson R, Zhou Liping. Spatial and temporal reconstructions of changes in the Asian palaeomonsoon:A new mineral magnetic approach[J]. Earth Planetary Science Letters, 1994, 125(1/4):461-471.
[18] Han Jiamao, Lü Houyuan, Wu Naiqin, et al. The magnetic susceptibility of modern soils in China and its use for paleoclimate reconstruction[J]. Studia Geophysica et Geodaetica, 1996, 40(3):262-275.
[19] Li Guanhua, Xia Dunsheng, Wen Yanglei, et al. Rock magnetism of the loess/paleosol sequences in north of the Tianshan Mountains, Northwest China[J]. Quaternary Sciences, 2013, 33(5):900-910.[李冠华, 夏敦胜, 温仰磊, 等. 天山北麓典型黄土沉积序列的磁学特征及主控因子初探[J]. 第四纪研究, 2013, 33(5):900-910.]
[20] Li Pingyuan, Liu Xiuming, Guo Xuelian, et al. The magnetic susceptibility properties of top soil's in Gobi-Loess Plateau, Northwest China[J]. Quaternary Sciences, 2013, 33(2):360-367.[李平原, 刘秀铭, 郭雪莲, 等. 西北戈壁沙漠-黄土高原区表土磁化率特征及其意义[J]. 第四纪研究, 2013, 33(2):360-367.]
[21] Long Xiaoyong, Ji Junfeng, William B. Rainfall-dependent transformations of iron oxides in a tropical saprolite transect of Hainan Island, South China:Spectral and magnetic measurements[J]. Journal of Geophysical Research:Earth Surface, 2011, 116(F3):1-9.
[22] Song Yougui, Shi Zhengtao, Fang Xiaomin, et al. Loess magnetic properties in the Ili Basin and their correlation with the Chinese Loess Plateau[J]. Scientia Sinica(Terrae), 2010, 53(3):419-431.[宋友桂, 史正涛, 方小敏, 等. 伊犁黄土的磁学性质及其与黄土高原对比[J]. 中国科学:地球科学, 2010(1):61-72.]
[23] Long Xiaoyong, Ji Junfeng, Barron V, et al. Climatic thresholds for pedogenic iron oxides under aerobic conditions:Processes and their significance in paleoclimate reconstruction[J]. Quaternary Science Reviews, 2016, 150:264-277.
[24] Torrent J, Liu Qingsong, Bloemendal J, et al. Magnetic enhancement and iron oxides in the upper Luochuan loess paleosol sequence, Chinese Loess Plateau[J]. Soil Science Society of America Journal, 2007, 71(5):1570-1578.
[25] Hu Pengxiang, Liu Qingsong, Heslop D, et al. Soil moisture balance and magnetic enhancement in loess paleosol sequences from the Tibetan Plateau and Chinese Loess Plateau[J]. Earth and Planetary Science Letters, 2015, 409:120-132.
[26] Liu Weimin. Loess recorded climatic change during the last glaciation on the eastern Tibetan Plateau, western Sichuan[D]. Lanzhou:Lanzhou University, 2008.[刘维明. 川西高原黄土记录的末次冰期气候变化[D]. 兰州:兰州大学, 2008.]
[27] Chai Zongxin. A discussion on the formation of the plateau in west Sichuan[J]. Journal of Mountain Research, 1983, 1(4):22-30.[柴宗新. 试论川西高原的形成[J]. 山地学报, 1983, 1(4):22-30.]
[28] Fang Xiaomin, Chen Fubin. Shi Yafeng, et al. Garz Loess and the evolution of the cryosphere on the Tibetan Plateau[J]. Journal of Glaciology and Geocryology, 1996, 18(3):193-200.[方小敏, 陈富斌, 施雅风, 等. 甘孜黄土与青藏高原冰冻圈演化[J]. 冰川冻土, 1996, 18(3):193-200.]
[29] Pan Baotian, Wang Jianmin. Loess record of Qinghai-Xizang Plateau monsoon variations in the eastern part of the plateau since the last interglacial[J]. Quaternary Sciences, 1999, 19(4):330-335.[潘保田, 王建民. 末次间冰期以来青藏高原东部季风演化的黄土沉积记录[J]. 第四纪研究, 1999, 19(4):330-335.]
[30] Yan Maodu, Fang Xiaomin, Chen Shiyue, et al. Pleistocene magnetic susceptibility and paleomagnetism of the Tibetan loess and its implications on large climatic change events[J]. Science in China:Series D Earth Sciences, 2001, 44(1):227-232.
[31] Qiao Yansong, Zhao Zhizhong, Wang Yan, et al. Magnetostratigraphy and its paleoclimatic significance of a Loess-Soil sequence from Ganzi area, West Sichuan Plateau[J]. Quaternary Sciences, 2006, 26(2):250-256.[乔彦松, 赵志中, 王燕, 等. 川西甘孜黄土磁性地层学研究及其古气候意义[J]. 第四纪研究, 2006, 26(2):250-256.]
[32] Ou Xianjiao, Zeng Lanhua, Zhou Shangzhe, et al. A review on research of loess and environmental change in west Sichuan Plateau of the eastern Qinghai-Tibetan Plateau[J]. Journal of Earth Environment, 2012, 3(1):692-704.[欧先交, 曾兰华, 周尚哲, 等. 四川西部黄土沉积与环境演变研究综述[J]. 地球环境学报, 2012, 3(1):692-704.]
[33] Chen Shiyue, Fang Xiaomin, Wang Sumin. Relation between the loess stratigraphy on the eastern Tibetan Plateau and Indian monsoon[J]. Marine Geology & Quaternary Geology, 2002, 22(3):41-46.[陈诗越, 方小敏, 王苏民. 川西高原甘孜黄土与印度季风演化关系[J]. 海洋地质与第四纪地质, 2002, 22(3):41-46.]
[34] Jiang Fuchu, Wu Xihao, Xiao Guohua, et al. The Ganzi loess stratigraphy in the west Sichuan Plateau[J]. Acta Geoscientia Sinica, 1997, 18(4):413-420.[蒋复初, 吴锡浩, 肖国华, 等. 川西高原甘孜黄土地层学[J]. 地球学报, 1997, 18(4):413-420.]
[35] Song Yang, Hao Qingzhen, Ge Junyi, et al. Quantitative relationships between modern soil magnetic susceptibility and climatic variables of the Chinese Loess Plateau[J]. Quaternary Sciences, 2012, 32(4):679-689.[宋扬, 郝青振, 葛俊逸, 等. 黄土高原表土磁化率与气候要素的定量关系研究[J]. 第四纪研究, 2012, 32(4):679-690.]
[36] Liu Qingsong, Torrent J, Maher B A, et al. Quantifying grain size distribution of pedogenic magnetic particles in Chinese loess and its significance for pedogenesis[J]. Journal of Geophysical Research:Solid Earth, 2005, 110(B11):1-7.
[37] Jia Jia, Wang Youjun, Xia Dunsheng, et al. Implication of pedogenic fine-grained magnetic material in loess sediment[J]. Journal of Earth Environment, 2014, 5(2):49-55.[贾佳, 王友郡, 夏敦胜, 等. 黄土沉积物中次生细粒强磁性矿物记录的古气候信息[J]. 地球环境学报, 2014, 5(2):49-55.]
[38] Maher B A, Alekseev A, Alekseeva T. Magnetic mineralogy of soils across the Russian Steppe:climatic dependence of pedogenic magnetite formation[J]. Palaeogeography, Palaeoclimatology, Palaeoecology, 2003, 201(3/4):321-341.
[39] Maxbauer D P, Feinberg J M, Fox D L. Magnetic mineral assemblages in soils and paleosols as the basis for paleoprecipitation proxies:A review of magnetic methods and challenges[J]. Earth-Science Reviews, 2016, 155:28-48.
[40] Zhou Changyan, Li Yueqing, Li Wei, et al. Climatological characteristics of water vapor transport over eastern part of Qinghai-Xizang Plateau and its surroundings[J]. Plateau Meteorology, 2005, 24(6):881-888.[周长艳, 李跃清, 李薇, 等. 青藏高原东部及邻近地区水汽输送的气候特征[J]. 高原气象, 2005, 24(6):881-888.]
[41] Liu Dongyan. Paleoclimate evolution since the late early pleistocene:an evidence from a loess record, Ganzi, west Sichuan Plateau[D]. Qingdao:Ocean University of China, 2009.[刘冬雁. 川西高原甘孜黄土记录的早更新世晚期以来的古气候变化[D]. 青岛:中国海洋大学, 2009.]
[42] Ren Yu, Zhang Xueqin, Li Shengchen, et al. Precipitation anomalies in flood-season and atmospheric water vapor transport over the southern Qinghai Plateau[J]. Journal of Glaciology and Geocryology, 2008, 30(1):35-42.[任雨, 张雪芹, 李生辰, 等. 青南高原汛期降水异常与水汽输送[J]. 冰川冻土, 2008, 30(1):35-42.]
[43] Wei Haitao, Xia Dunsheng, Chen Fahu, et al. Relationship between the magnetic susceptibility of surface soil and precipitation of Loess Plateau and Adjacent Area[J]. Journal of Glaciology and Geocryology, 2008, 30(3):433-439.[魏海涛, 夏敦胜, 陈发虎,等. 黄土高原及相邻地区表土磁化率与降水量的关系[J]. 冰川冻土, 2008, 30(3):433-439.]
[44] Zhang Wenxiang, Shi Zhengtao, Liu Yong, et al. Climatic record in the loess-paleosol sediment in the Ili basin and comparative analysis with the Heinrich events[J]. Journal of Glaciology and Geocryology, 2015, 37(4):973-979.[张文翔, 史正涛, 刘勇, 等. 新疆伊犁盆地黄土古气候记录与Heinrich事件对比分析[J]. 冰川冻土, 2015, 37(4):973-979.]
[45] Fang Xiaomin, Li Jijun, Zhou Shangzhe, et al. Aeolian sand deposition in the source area of Yellow River and its significance[J]. Acta Sedimentologica Sinica, 1998(1):40-44.[方小敏, 李吉均, 周尚哲, 等. 黄河源风沙沉积及意义[J]. 沉积学报, 1998(1):40-44.]
[46] Wang Jianmin, Pan Baotian. Loess deposit in eastern part of Qinghai-Xizang Plateau:its characteristics and environment[J]. Journal of Desert Research, 1997, 17(4):395-402.[王建民, 潘保田. 青藏高原东部黄土沉积的基本特征及其环境[J]. 中国沙漠, 1997, 17(4):395-402.]
[47] Wang Yunsheng, Li Yongzhao, Xiang Fang. The Ganzi loess origin in the west Sichuan Plateau[J]. Journal of Geomechanics, 2003, 9(1):96-96.[王运生, 李永昭, 向芳. 川西高原甘孜黄土的成因[J]. 地质力学学报, 2003, 9(1):91-96.]
[48] Oldfield F. Environmental magnetism:a practical guide[M]. London:Quaternary Research Association, 1999.
[49] Sun Youbin, Sun Donghuai, An Zhisheng. Paleoclimatic implication of frequency dependent magnetic susceptibility of red clay-loess-palesol sequences in the lingtai profile[J]. Geological Journal of China Universities, 2001, 7(3):300-306.[孙有斌, 孙东怀, 安芷生. 灵台红黏土-黄土-古土壤序列频率磁化率的古气候意义[J]. 高校地质学报, 2001, 7(3):300-306.]
[50] Jia Jia, Xia Dunsheng, Jin Ming, et al. Typical loess/paleosol sequences in Weihe drainage areas:Environmental magnetism features and paleoclimate interpretation[J]. Journal of Glaciology and Geocryology, 2010, 32(1):92-97.[贾佳, 夏敦胜, 金明, 等. 渭河流域典型黄土剖面的环境磁学特征及其古气候意义[J]. 冰川冻土, 2010, 32(1):91-97.]
[51] Liu Xiuming, Xia Dunsheng, Liu Dongsheng, et al. Discussion on two models of paleoclimatic records of magnetic susceptibility of Alaskan and Chinese loess[J]. Quaternary Sciences, 2007, 27(2):210-220.[刘秀铭, 夏敦胜, 刘东生, 等. 中国黄土和阿拉斯加黄土磁化率气候记录的两种模式探讨[J]. 第四纪研究, 2007, 27(2):210-220.]