基于景观格局的地表覆盖时空变化研究

景观格局分析方法是地理国情综合统计分析的重要方法。文章以地理国情普查试点区域的荒漠与裸露地表为例,使用GIS软件计算出荒漠与裸露地表在不同时间的景观格局指数、最邻近点指数及面积加权质心,分析了试验区荒漠与裸露地表的空间分布格局及其时空变化特征。结果表明,荒漠与裸露地表斑块面积大幅减小,斑块形状趋于规则化;破碎化程度、聚集程度均增大;空间质心向西部迁移至研究区境外,区域内生态环境明显好转。

Spatial-temporal Changes of Surface Cover Based on Landscape Pattern

Landscape pattern analysis is an important method to study comprehensive statistical analysis of the geographical condi-tions.Taking the desert and bare surface data of geographic condition census in an experimental area for example, the landscape indi-ces of the desert and bare surface, the nearest point index and area-weighted centuroid were calculated in different times using geo-graphic information system software, to analyse its spatial pattern evolution.The results showed that the patch area of the desert and bare surface has significantly reduced, the shape of patches tends to regularization, the fragmentation and aggregation degree has in-creased and spatial centroid migrate to the west gradually, even outside of the test area.The ecological environment has significantly improved the in the test region.