| 魏伟,赵军,王旭峰.石羊河流域景观类型与影响因子的空间关系[J].干旱地区农业研究,2010,28(6):228~234 |
| 石羊河流域景观类型与影响因子的空间关系 |
| 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 |
| 中文关键词: 植被覆盖 景观类型 NDVI 空间关系 石羊河流域 |
| 英文关键词:vegetation landscape type NDVI spatial relationship Shiyang River basin |
| 基金项目:国家自然科学基金重点项目(40671067)；甘肃省自然地理学重点学科项目(5001-048) |
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| 中文摘要: |
| 以Landsat/TM为数据源,在ArcGIS支持下解译出研究区各景观类型,采用主成分变换法(PCA)和回归分析方法,结合景观类型图和数字高程模型(DEM),参考相关地理基础图件,对石羊河流域海拔和植被覆盖进行分级分类。在此基础上运用叠置分析法研究了不同海拔高度和不同植被覆盖下景观类型的变化情况,同时分析了各景观类型与海拔和植被覆盖三者之间的空间关系。结果表明:研究区各景观类型的利用向非均匀化方向发展,区域内各景观类型间的比例差异在进一步增加。研究区各景观类型大体依海拔呈垂直性分布,各自然要素组成垂直分异性特征亦较为明显。低海拔地区,景观类型分布较为单一,且与海拔和NDVI关系密切,相关性较高。高海拔地区各景观交错分布,界线不一,且分布呈现不均衡特征,且与海拔、NDVI的分布关系复杂,拟合效果不理想。 |
| 英文摘要: |
| 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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