【摘要】 以云南省土地利用图为基本图件,借助地理信息系统软件,运用景观生态学原理和方法研究云南省国际大通道建设对山地景观格局的影响,选择了澜沧江流域中下游两个典型区公路段,通过计算不同缓冲区景观格局指数的变化来定量化研究公路建设对景观格局影响规律。结果表明,道路修建直接导致景观格局改变,斑块数目、斑块密度、边缘密度和分维数增加,景观异质性增加;进一步研究表明,道路建设对缓冲区200 m内的景观格局直接影响最大,200 m外的影响趋于缓和;而多样性指数和均匀度指数在不同缓冲区变化不是很大;分析结果也表明,澜沧江中下游土地利用的空间分异和地貌差异也导致道路建设对景观格局影响不同。更多还原

【Abstract】 Ecological conservation on landscape scale is a vital way to construct regional ecological security pattern and road landscape ecology research has important role in road zone construction.As a special land use in landscape,road has "corridor-barrier" role and effects on surrounding landscape.The study focuses on regional landscape pattern change of two international passages construction by GIS software based on the land use map of Yunnan province.Two representative road sects were selected in middle(Dali sect) and lower reaches(Simao sect) of Lancangjiang River valley and certain landscape indexes of different road buffers including 100 m,200 m,500 m,1000 m,2000 m were calculated to quantify the effects of road construction.The results showed landscape pattern changed greatly after road construction.Patch number,patch density,edge density and fractural dimension increased showing the landscape heterogeneity increased.Due to different land use and elevation,landscape index differed in the two sects.Patch number,landscape aggregation,edge density and landscape split index were greater in Dali sect but the diversity and evenness index showed little change in different buffers.Direct effect was mainly limited in the 200 m road buffer region based on the landscape indexes including the patch number, landscape aggregation,and edge density change.The comprehensive index show little change beyond the 200 m buffer.The results also showed that effects of road construction exhibited different due to the different land use and topography of the two regions.更多还原