杜婧^1,2,3,,
鲁瑞洁^1,2,3,,,
刘小槺⁴,
贾飞飞⁵,
高尚玉^1,2,3
1. 地表过程与资源生态国家重点实验室, 北京师范大学地理科学学部, 北京 100875
2. 防沙治沙教育部工程研究中心, 北京师范大学地理科学学部, 北京 100875
3. 环境演变与自然灾害教育部重点实验室, 北京师范大学地理科学学部, 北京 100875
4. 陕西师范大学地理科学与旅游学院, 陕西 西安 710062
5. 辽宁师范大学, 城市与环境学院, 辽宁 大连 116029

基金项目: 国家自然科学基金项目(批准号:41330748)和国家重点基础研究发展计划项目(批准号:2017YFC1502401)共同资助


详细信息

作者简介: 杜婧, 女, 27岁, 硕士研究生, 环境演变专业, E-mail:dujing0611@mail.bnu.edu.cn

通讯作者: 鲁瑞洁, E-mail:ruijielu@bnu.edu.cn

中图分类号: P534.63⁺2;P941.73;P532;P595

收稿日期:2018-06-28
修回日期:2018-11-01
刊出日期:2019-03-30

Study on the evolution of pedogenesis environment on the southeast margin of the Mu Us Desert since Holocene

Du Jing^1,2,3,,
Lu Ruijie^1,2,3,,,
Liu Xiaokang⁴,
Jia Feifei⁵,
Gao Shangyu^1,2,3
1. State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing 100875
2. Engineering Center of Desertification and Blown-Sand Control of Ministry of Education, Faculty of Geographical Science, Beijing Normal University, Beijing 100875
3. Key Laboratory of Environmental Change and Natural Disaster of Ministry of Education, Faculty of Geographical Science, Beijing Normal University, Beijing 100875
4. School of Geography and Tourism, Shaanxi Normal University, Xi'an 710062, Shaanxi
5. School of Urban and Environmental Sciences, Liaoning Normal University, Dalian 116029, Liaoning


More Information

Corresponding author: Lu Ruijie,E-mail:ruijielu@bnu.edu.cn

MSC: P534.63⁺2;P941.73;P532;P595

--> Received Date: 28 June 2018
Revised Date: 01 November 2018
Publish Date: 30 March 2019


摘要
摘要:古土壤是重建古环境重要的信息源。毛乌素沙地东南缘的古土壤在发育程度上尚未有明确解释。陕西省榆林市的镇北台地区位于毛乌素沙地东南边缘，对气候响应敏感。本文选取厚度为524 cm的镇北台（ZBT）剖面，按照古土壤2 cm、风成砂5 cm的间隔共采集古土壤样品156个，风成砂样品58个。基于6个AMS¹⁴C和3个OSL年代样品，推测剖面古土壤底部年龄为10 cal.ka B. P.，顶部年龄为3.2 cal.ka B. P.；并结合土壤微形态特征，对镇北台剖面沉积物中常量元素特征与成壤强度进行分析探讨。结果表明，镇北台（ZBT）剖面常量元素组成以SiO₂、Al₂O₃和Na₂O为主。CIA指数指示剖面处于脱Ca、Na为主的初级风化阶段，反映了毛乌素沙地东南缘全新世以来可能以相对干旱的气候环境为主，风化成壤作用较弱，但其中也不乏幅度较小的冷暖气候旋回。土壤微形态特征也表明ZBT剖面风化程度较弱，主要矿物由石英、长石、云母和岩屑矿物构成，可见胶结物和泥岩岩屑等土壤形成物。其成壤强度变化与化学元素特征表现一致：10.0~8.1 cal.ka B. P.左右，成壤较弱，气候向暖湿转变；6.9 cal.ka B. P.左右，成壤作用稍有加强；5.5~3.7 cal.ka B. P.左右，成壤作用最强，气候相对暖湿，化学、生物风化加强，但此阶段具有明显的不稳定性
关键词: 毛乌素沙地/
全新世/
化学元素/
土壤微形态/
成壤作用

Abstract:Palaeosol is an important source of information for the reconstruction of paleoenvironment because of its rich environmental information. There is no clear explanation for the degree of development of palaeosol in the southeastern margin of the Mu Us Desert. This paper selected a typical aeolian-palaeosol sequence (ZBT profile:38°20'N, 109°44'E) located at junction of the southeastern margin of the Mu Us Desert and the Loess Plateau. ZBT profile belongs to Zhenbeitai area of Yulin City, Shaanxi Province. ZBT profile was 524 cm in depth, and 156 samples were taken at an interval of 2 cm in palaeosol section, while 58 samples were taken at an interval of 5 cm in aeolian section. Based on the 6 dates of AMS ¹⁴C and 3 dates of OSL, it is speculated that the age of bottom of the paleosol is 10 cal.ka B. P., and the age of the top is 3.2 cal.ka B. P. The characteristics of major elements in the sediments and the intensity of the soil were analyzed. The results showed that the major elements of ZBT profile were SiO₂, Al₂O₃ and Na₂O, indicated that the section is always in the primary weathering stage with leaching Ca and Na from CIA index, which indicated that may be a relatively arid climate environment since the Holocene in the region, and the weathering effect was weak, but there were a small cold and warm climate cycling. The soil micromorphology also showed that the weathering of the ZBT profile was relatively weak. The main minerals were quartz, feldspar, mica and lithic minerals of palaeosol. Pedogenesis product such as cements and mudstones can be seen. The changes in the intensity of pedogenesis were consistent with the characteristics of chemical elements:From 10.0 cal.ka B.P. to 8.1 cal.ka B.P., the pedogenesis were weak, and the climate shifted to warm and humid; At about 6.9 cal.ka B. P., the pedogenesis were slightly strengthened; From 5.5 cal.ka B.P. to 3.7 cal.ka B. P., pedogenesis were the strongest, the climate was relatively warm and humid, chemical and biological weathering strengthened, but this stage was obvious instability.
Key words:Mu Us Desert/
Holocene/
chemical elements/
soil micromorphology/
pedogenesis



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