| The spatial relationship between landscape types and impact factors in Shiyang River basin |
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| DOI：10.7606/j.issn.1000-7601.2010.06.41 |
| Key Words: vegetation landscape type NDVI spatial relationship Shiyang River basin |
| Author Name | Affiliation | | WEI Wei | College of Geographical and Environmental Sciences, Norhwest Normal University, Lanzhou, Gansu 730070, China | | ZHAO Jun | College of Geographical and Environmental Sciences, Norhwest Normal University, Lanzhou, Gansu 730070, China | | WANG Xufeng | Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanshou, Cansu 730000，China |
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| Abstract: |
| With the support of GIS technology , and taking the Landsat/TM images as the data source, 14 types of
landscapes in Shiyang River basin were obtained in the study by employing artificial interpretation method. A series of
other data such as DEM，vegetation maps, and land use maps were also used. Besides principal component analysis as well as regression methods were adopted to analyze the landscape changes in different atitude and vegetation, and the spa-tial relationship between NDVI, DEM and landscpe types were also studied. The results showed that the landscape uti-lization developed to the heterogeneous directions, indicating that the proportional difference between various landscape types was increasing. The landscape types showed vertical distribution in termns of elevation. Moreover, the vertical-spe-cific characteristics of natural elements were more obvious. In low-altitude areas，distribution of landscape types was rela-tively single, and the relationship between NDVI and elevation was closely associated. While in high-altitude areas, the distribution of landscape types was staggered . The distribution boundaries and characteristics presented unbalanced. Hence the relaiontship among landscape types, NDVI and DEM was very complex, and the regression results about them were not very perfect. However, the research ideas and results were significant for vegetation and ecological environment changes in the arid inland revier basins. |
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