Technology Application |
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A STUDY OF LAND DESERTIFICATION DYNAMIC CHANGE IN YELLOW RIVER BASIN |
SUN Yong-jun 1,2,ZHOU qiang 2,YANG Ri-hong 2 |
1.Institute of Remote Sensing and GIS,Peking University,Beijing 100871,China;
2. China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China |
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Abstract Dynamic change information of land desertification in the Yellow River Drainage Area was extracted from remote sensing images of three different periods,which include MSS (1975),TM (1990) and ETM (2000). Investigation shows that land desertification mainly occurred in the northwestern part and the area of land desertification increased 10 653.22 km2 from 1975 to 2000,i.e.,about 426.12 km2 per year. It was the geological and climate conditions that controlled the distribution and dynamic change trend of land desertification. In addition,improper human activity accelerated the desertification trend.
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Keywords
Information of remote sensing
Picking out
Chronostratigraphic interface
Tectonic evolution stage
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Issue Date: 15 July 2009
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