• 责任者：Zhu Fangying (Laboratory of Earth Surface Process and Environment ; School of Geographic and Oceanographic Sciences ; Nanjing University ; Nanjiag 210093 ; China) ; Lu Huayu
• 刊名：Quaternary Sciences
• 出版年：2013
• 卷期：33(2)
• 关键词：沙漠 ; deserts ; 中国 ; China
• 页码：p.197-205
• 图表：illus., 1 table, 28 refs.
• 分类号：1800
• issnNo：ISSN1001-7410
• isbnNo：CN11-2708/P

There is an extensive area where is covered by deserts, sandy fields and Gobi deserts in Northern China,spacerun: yes">  environment and vegetation of this region are dominated by the East Asian monsoon circulation and the Westerly Jetspacerun: yes">  respectively. The area of deserts, sandy fields and Gobi deserts has significantly changed with climate changes during the Last Glacial Maximum （LGM） and the Holocene Optimum （ HO）, but a quantitative reconstruction of the borders of these deserts, sand fields and Gobi deserts was not carried out. In order to achieve such a goal,borders of the modern deserts, sandy fields and Gobi deserts should be firstly obtained. In this study,based on combination of remote sensing （RS）, global position system （GPS） and geographic information system （GIS） techniques, as well as the enhanced thematic mapper （ETM !. remote sensing images and the spectral angle method, we mapped the deserts and sandy fields in Northern China. We firstly used the methods of geometric precision correction, image mosaicking,wave band combination and image enhancement to treat with the ETM images. Then, to establish an interpret marker of desertification, using the band 7,5 and 2 of the ETM images. Third, to use the spectral angle method to identify margin of active dune, soil and vegetation cover. Typical points were measured in the field by the GPS,and were used to correct the dune field boundary data. An existing data set was combined with our results to create a new GIS database for the deserts and sand fields in Northern China, containing landform, soil and vegetation. This database can be used as a reference for studying desert area variations during the LGM and HO. In addition,we used the National Climatic Data from 1950 to 2010 to analyze relationship between climate and landform, soil and vegetation types. Impact of climate change on desert border locations within the last 60 years was investigated,taking the Horqin desert as an example. The results show that relative humidity is the most significant driver of the spatio-temporal changes of the deserts and sandy fields in Northern China. The impact of human activity on environment of the sandy field was not analyzed in this study but needed in the future investigation.