Technology Application |
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The Change of Wetland in Hexi Corridor in the Past Thirty Years and a Tentative Discussion on Its Mechanism |
BAI Lei, JIANG Qi-Gang, LIU Wan-Song, CUI Han-Wen |
College of Geoexploration Science and Technology, Jilin University, Changchun 130026, China |
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Abstract In this paper, the wetland in Hexi Corridor was dynamically monitored by remote sensing technology using four different
temporal remote sensing data. The results show that the area of the wetland was 14 132.38 km2 in 1973, 13 299.44 km2 in 1990, 12
519.88 km2 in 2000, and 12 312.38 km2 in 2006. In the past 30 years, the reduced area amounted to 1 820.00 km2, which occupied
12.88% of the total area, with the dynamic degree being -0.39%. Natural wetland has been reduced continuously at an accelerating
speed, with swamp reduced most significantly. Meanwhile, the area of man-made wetland has steadily increased, especially in
recent years. The number and density of wetland patches have increased, and the fragmentation degree now is higher than that in
the past. The diversity index and evenness index have increased continuously, the difference between the proportions of various
wetlands have decreased, and the distribution wetlands tends to become uniform. Temperature, precipitation, uplift of the Tibetan
plateau and other natural factors seem to be the important causes for wetland change in Hexi Corridor. In addition, human
activities have undoubtedly aggravated such a tendency.
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Keywords
Basin
Remote Sensing
Structure
Uranium Metallization
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Issue Date: 22 March 2010
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