Advances in Earth Science ›› 2005, Vol. 20 ›› Issue (12): 1300-1305. doi: 10.11867/j.issn.1001-8166.2005.12.1300

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ZHANG Xiaoyou 1,GONG Jiadong 1,ZHAO Xue 2,ZHOU Maoxian 1   

  1. 1.Cold and Arid Region Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou  730000,China;2.Yantai Nornal University,Yantai  264025,China 
  • Received:2004-12-09 Revised:2005-08-01 Online:2005-12-25 Published:2005-12-25

ZHANG Xiaoyou,GONG Jiadong,ZHAO Xue,ZHOU Maoxian. THE CHANGE OF LAND COVER/LAND USE IN EJINA OASIS OVER 20 YEARS[J]. Advances in Earth Science, 2005, 20(12): 1300-1305.

Land use and land cover change have been of great concern in global change study in recent years. Base on comparison with the remote sensing data in 1982 and 2000 and field investigation, the results of land cover and land use change were obtained by the method of landscape analysis. Ten types of land use were identified: riparian woods, riparian shrubbery, desert shrubbery, desert grassland, river-way and water area, salinised land, town, Gobi, shift sand dune, denudative upland. The results show that, (1) there were obvious changes in land cover structure. The area of riparian woods decreased 0.97% and the number of patch decreased 376; the area of riparian shrubbery decreased 0.92% and the number of patch decreased 1316. Meanwhile, the index of %LAND of desert shrubbery increased from 4.49% to 5.65%; Because of decrease of water quantity of discharge from middle reach. The patch of riverway and water area decreased from 40 to 6. the index of %LAND decreased 0.15%. At the same time, the index of %LAND of shift sand dune increase 0.42%. (2) the areas of riparian woods dominated by Populus euphratica and desert grassland decrease to 45.02% and 14.55%. However, the areas of riparian shrubbery dominated by Tamarix Spp and desert shrubbery increase to 35.03% and 25.88%. The transition probability is 45.95% from riparian woods to riparian shrubbery. At the same time, they are 0.78% and 3.01% from riparian woods to desert shrubbery and desert grassland. The succession trend of ecosystem was obtained: riparian woods→ riparian shrubbery and grassland→desert grassland. Meanwhile, the succession velocity becomes higher and higher.

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