以遥感影像为基础数据源, 通过面向对象的影像分析软件Ecognition和ArcGIS软件, 解译提取昌化江流域1995年、2000年和2007年天然林信息, 以Fragstats景观格局分析软件为景观指数计算工具, 选择景观斑块形状指数、景观斑块数量破碎化指数、景观斑块分维数指数等指标, 对昌化江流域天然林空间格局的动态变化进行研究。结果表明:1995年、2000年和2007年昌化江流域天然林总面积分别为1 431.38 km2, 2 143.17km2 和1 487.98km2, 天然林景观空间格局发生了波浪形变化, 目前天然林破坏严重。分析结果为天然林的保护与恢复提供了科学依据。
Based on the remote sensing image data, and with the support of Ecognition, a professional objectoriented remote sensing classification soft ware and Arcgis, the spatial information of the natural forest acquired in the years of 1995, 2000 and 2007 for the Changhua Jiang Basin was extracted for the analysis of the overall changing characteristics of landscape pattern.The software of Fragstats was for data processing and indexes calculating. The landscape patch density indexes, the landscape patch quantity f ragmentation indexes, landscape patch shape f ragmentation indexes and landscape isolation indexes were selected for assessing landscape f ragmentation.The overall changing situation of landscape fragmentation is as follows:total area of the natural forest in the study area was 1 431.38km2 in 1995, 2 143.17km2 in 2000, while in 2007 reduced to 1 487.98km2.Spatial pattern of wildwood landscape has taken wave-shaped change.At present the dest ruction of natural forest is serious.These results provide the scientific basis for natural forest development and recovery.
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