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| Analysis of land use pattern change in coarse sandy region of middle reaches of Yellow River |
| Li Gun1,Liang Wei2,3,Yang Qinke2,3 |
| 1.University of Electronic Science and Technology of China,610054,Chengdu;2.Institute of Soil and Water Conservation,Northwest Sci-tech University of Agriculture and Forestry,3.Institute of Soil and Water Conservation,CAS & MWR: 712100,Yangling,Shaanxi: China |
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Abstract The land use information was extracted from the remotely sensed imagery of the year of 1977,1997 and 2006 automatically assisted by the computer.Based on these thematic maps,the land use dynamic degree,conversion matrix,frequency and importance indices were calculated by the combined means of GIS spatial analysis and statistics analysis.And the land use change range,speed,direction and regional diversity were analyzed from 1977 to 2006.Results indicated: 1) The area of building site and forest keep increasing,inversely,the cropland and the waste land are on the state of decreasing.From 1977 to 1997,the grassland decreases and water body increases;at the same time,from 1997 to 2006,the grassland increases and water body reduces.The mutual transformation between land use types was more violent from 1977 to 1997 than that from 1997 to 2006.2) Mutual transformation mainly between cropland and grassland,grassland and forest,grassland and waste land.3) The leading types and the major directions of the land use change are cropland,grassland,forest and waste land.The mutual transformation between cropland and grassland mainly occurs in the piece sandy and liangmao hilly regions.The mutual transformation between grassland and forest mainly occurs in wind sandy hilly region and earth-rocky mountain region.The mutual transformation between grassland and waste land mainly occurs in the wind sandy hilly region.
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Received: 11 October 2008
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