【摘要】 基于景观格局理论,利用绵竹市北部山区"5·12"汶川地震前后TM遥感影像,进行土地利用分类的遥感解译。以地震前后的土地利用分类图为数据源,使用FRAGSTATS景观格局软件,在类型、景观两个级别上,研究汶川地震造成的土地灾毁对于整个绵竹山区景观格局产生的干扰,对不同景观类型的优势度、形状指数和破碎度进行探讨。结果表明,土地灾毁对有林地的影响最为严重,其优势度变小,破碎度变大,边缘密度变大,造成边缘效应增强;灌木林、丘陵旱地的面积明显减少;景观类型间的连通性、聚集度变小。总的来说,整个绵竹北部山区生态系统稳定性较震前变差。更多还原

【Abstract】 Based on the landscape pattern theory,this paper made use of the TM remote sensing images of northern mountain areas of Mianzhu obtained before and after the Wenchuan May 12,2008 earthquake for the work of land use classification.With the land-use classification map as the data source,the authors studied the disturbance of the earthquake to the landscape pattern in the aspects of classification and landscape level,and discussed the dominance,shape index and degree of fragmentation in different classes on the basis of FRAGSTATS software.The result shows that the woodland was most greatly affected,as evidence by the facts that its dominance was decreased,its degree of fragmentation was raised,and the edge effect was increased by the increasing edge density.In addition,the area of bush-wood and hilly dry field was deduced evidently,and the circulation and CONTAG of the landscape were decreased.In a word,the stability of the ecosystem is worse than that of the pre-earthquake period.更多还原