Arid
DOI10.1007/s11442-022-1964-y
The recent evolution of dune landforms and its environmental indications in the mid-latitude desert area (Hexi Corridor)
Zhu Bingqi
通讯作者Zhu, BQ
来源期刊JOURNAL OF GEOGRAPHICAL SCIENCES
ISSN1009-637X
EISSN1861-9568
出版年2022
卷号32期号:4页码:617-644
英文摘要The history of dune landform changes and dust activity at mid-latitudes is a good archive for exploring environmental changes and related landscape response. In this study, the dynamic changes, material sources, dust activity history and the influencing factors of typical sand dunes in the Hexi Corridor were comprehensively analyzed from the aspects of aeolian geomorphology, grain-size sedimentology, geochemistry and climatology. The results show that in the past half century, the typical crescent-shaped dunes and chains of crescent-shaped dunes in the study area have moved or swayed greatly, with an average speed ranging from 0.8 m/a (Dunhuang) to 6.2 m/a (Minqin). The dynamic changes of sand dunes are mainly affected by annual precipitation, annual average wind speed and annual gale days, which indicates that climate is the primary influencing factor of dune landform changes. The three-stage grain-size curve model of dune sands is obviously different from that of gobi sediments (two-stage), revealing the immaturity of the latter in sedimentology, while the former has experienced efficiently aeolian differentiation and non-local origin. The comprehensive evidences of paleogeography, sedimentology and geochemistry reveal that the source materials of sand dunes are mainly alluvial/proluvial and palaeo-fluvial sediments, including clastic sediments in the denudation/erosion zones of the north and south piedmonts. Indicators such as the proportion of surface fine particles, the coverage of surface salt crusts, and the content of erodible sandy materials indicate that the western gobi areas are not the main source areas of wind-blown dust in the central and eastern parts of the Hexi Corridor. The spatial distribution of the movement direction of sand dunes is similar to that of the regional dominant wind direction, which indicates that the difference in the dynamic evolution of dune landforms between the east and west of the Hexi Corridor should be controlled by the regional-scale wind system, that is, controlled by the dynamic mechanism rather than the difference in material sources. The warming and humidification of the Hexi climate is a synchronous response to the global warming and the strengthening of the Asian Summer Monsoon. It is also the main reason for the reduction of dust storms in the study area, which means that a potential inverse desertification process exists in the Hexi Corridor during the same period and it is also controlled by climate change. However, the process of desertification in the oasis areas during the period is caused by groundwater fluctuation affected by human activities.
英文关键词dune landform Gobi landform grain size sedimentology elemental geochemistry global warming desertification mid-latitude deserts
类型Article
语种英语
开放获取类型Bronze
收录类别SCI-E
WOS记录号WOS:000774940700003
WOS关键词TAKLAMAKAN DESERT ; NORTHERN CHINA ; LOESS DEPOSITS ; WESTERN CHINA ; MOJAVE DESERT ; DESERTIFICATION ; GEOCHEMISTRY ; PROVENANCE ; ROUGHNESS ; SEDIMENTS
WOS类目Geography, Physical
WOS研究方向Physical Geography
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/393447
推荐引用方式
GB/T 7714
Zhu Bingqi. The recent evolution of dune landforms and its environmental indications in the mid-latitude desert area (Hexi Corridor)[J],2022,32(4):617-644.
APA Zhu Bingqi.(2022).The recent evolution of dune landforms and its environmental indications in the mid-latitude desert area (Hexi Corridor).JOURNAL OF GEOGRAPHICAL SCIENCES,32(4),617-644.
MLA Zhu Bingqi."The recent evolution of dune landforms and its environmental indications in the mid-latitude desert area (Hexi Corridor)".JOURNAL OF GEOGRAPHICAL SCIENCES 32.4(2022):617-644.
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Zhu Bingqi]的文章
百度学术
百度学术中相似的文章
[Zhu Bingqi]的文章
必应学术
必应学术中相似的文章
[Zhu Bingqi]的文章
相关权益政策
暂无数据
收藏/分享

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。