OALib Journal期刊
ISSN: 2333-9721
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基于复杂网络的官厅水库流域土地利用/覆被变化
DOI: 10.11821/xb201201012, PP. 113-121
Keywords: 土地利用/覆被,复杂网络,关键变化地类,官厅水库
Abstract:
以北京西北部的官厅水库流域为研究区,以1978-2009年之间的6期Landsat系列遥感影像为基础数据解译土地利用图。将土地利用/覆被变化(LUCC)过程中的转移矩阵作为一种网络进行分析,土地利用类型是网络中的节点,不同地类之间的相互转化是网络的连线(边)。应用度、介数、网络平均最短路径等复杂网络方法,从土地利用系统整体的角度识别LUCC过程中的关键变化地类,评价土地利用系统的稳定性,分析生态环境变迁。研究结果表明①在近30年的时间尺度上,旱地、天然草地和人工水域始终是转移矩阵中3种关键变化地类,LUCC主要围绕这3种地类进行;②5期转移矩阵网络的平均最短路径值均小于1.5,土地利用系统的活动性强、稳定性差,但五期网络的平均最短路径值总体上呈现增大趋势,土地利用系统向稳定方向发展;③近30年来,自然生态系统不断被人工生态系统取代,自然生态系统中的天然草地面积减少了62.1%,未利用地的面积减少了65.1%。
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