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| Spatio-temporal feature of grassland degradation in MinXian based on RS & GIS method |
| XU Li-Hua1, CHEN Huai-Lu2, XU Ji-hua1 |
| 1.Geography Department of East China Normal University, Geographical information key Lab of Ministry of Education, ShangHai, 200062; 2. Geography Department of LanZhou University, LanZhou, 730000, China |
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Abstract Based on the data of grassland investigation in 1981 and grassland distribution calculated from TM remote sensing image by means of GIS technology in 2000, the spatial and temporal dynamic of in MinXians grassland is monitored. Contrasting the grassland of 1981 with one of 2000, the spatial feature of degradation would be researched in the paper. To most spatial analysts, Moran'I is probably a known measure to test spatial autocorrelation, and the Z-value of Moran'I indicates positive spatial autocorrelation. The results of Moran'I and Z(Gi*)and the moving plots all shows that the center of grassland degradation is the XiJiang village which is at the northwest of MinXian. From 1981 to 2000, the quantities of grasslands in the east are more than in the west, and the qualities of grasslands in the south are better than in the north. And the spatial structure of grassland is more obviously than before in the MinXian. It shows that the grassland is centralized degenerated in the northwest and middle of the MinXian, but the grassland of the some villages would be increasing in the east. It is caused by the lagging of the economic and technology. In other words, little money and poor technology are used in the area. So the area is weak to the disturbance from the environments.
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Received: 25 April 2004
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