Technology Application |
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REMOTE SENSING DETECTION OF DYNAMIC VARIATION OF THE SALINE LAND IN THE YELLOW RIVER DELTA |
GUAN Yuan-xiu1, LIU Gao-huan2 |
1. China Remote Sensing Satellite Ground Station, Chinese Academy of Sciences, Beijing 100086, China;
2. State Key Laboratory of Resources and Environment Information System, Institute of Geographyical Science and Resources, Chinese Academy of Sciences, Beijing 100101, China |
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Abstract Land salinization is a dynamic phenomenon or process. With the annual and seasonal variation of the groundwater table, the nature, extension, magnitude and spatial distribution of the saline land are changing from time to time. The grasp of the up-to-date and reliable information on the saline land is a prerequisite for land reclamation and regional sustainable development. For the purpose of providing a generalized view of a fairly large area, remote sensing is widely used in saline land survey and dynamic study. Three groups of Landsat data were selected for the study of saline land dynamics during the past 15 years in the Yellow River Delta. Based on repeated field survey and soil sample analysis, an integrated classification method was developed for the extraction of information about saline lands. The study shows that, from 1987 to 2000, the trend of land salinization was rapidly accelerated; light saline land greatly increased; strong saline land gradually decreased; barren saline land increased from 1987 to 1996 and then decreased. The spatial structure of saline land distribution in such 6 types of landforms as terrace uplands, present flood plain, abandoned river courses, embanked former back swamps, isolated depressions and salt marshes & tidal flats in2000 was almost the same as that in1987.
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Keywords
Jinan spring field
Land use
Driving forces
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Issue Date: 02 August 2011
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