九寨沟自然保护区景观格局及其斑块稳定性

以1987、1997和2005年3个时期遥感影像为基本信息源,并借助RS和GIS技术获取3个时期九寨沟自然保护区的景观类型矢量图和属性数据库,选取基质比例、斑块数量和面积变化率和斑块密度变化率等指标,运用数理统计的方法,对九寨沟自然保护区1987—1997年及1998—2005年两个时段的景观格局及其斑块稳定性进行了初步研究。结果表明:林地是九寨沟自然保护区景观的基质,且比例有所提高,处于稳定状态。林地和裸岩石砾地斑块稳定性最高,灌木林地和水域次之,草地稳定性较低;耕地与建设用地稳定性最低,这与1998年以来保护区实施的退耕还林、还草生态工程密切相关。草地斑块的稳定性对保护区的景观稳定性具有重要作用,尤其应对中小尺度的斑块予以特别重视。

Landscape Pattern and Patch Stability in Jiuzhaigou Nature Reserve

With the support of RS,GIS and mathematical methods of statistics,proportion of landscape matrix,patch number,percent change in patch area,and percent change in patch density were applied to analyze the landscape pattern and patch stability in Jiuzhaigou Nature Reserve during 1987-1997 and 1998-2005,using the remote sensing data from 1987,1997 and 2005 as the basic information sources.Results showed that forest land was the landscape matrix of the nature reserve,and the proportion of forest land increased and maintained in a stable condition.The highest patch stability was observed in forest land and bare rocky land,shrub land and water area took the second place,followed by grassland,and the stability of cultivated land and construction land was lowest,which was closely related to the conversion of cropland to forest land and grassland since 1998.The grassland patches play a very important role in the stability of the nature reserve;therefore,special attention should be paid to the small to medium-sized grassland patches.