Quantitative analysis and function division of landscape pattern based on terrain in Hongya County | 基于地形因素的洪雅县景观格局定量分析与功能划分

chinois. 以四川省洪雅县2010年10月LandsatTM卫星的中分辨率遥感影像为数据源，利用RS、GIS技术和Fragstats 3.3软件，选择斑块面积等9类景观指数对2010年洪雅县景观格局进行定量分析，以地形为分异基础进行景观类型分布特征分析。结果表明：洪雅县为山地景观，平均斑块面积2.2245hm2，景观形状指数137.46，斑块密度45块/km2，平均斑块分维数1.0629，景观类型形状简单，破碎化程度低，景观格局稳定。林地和耕地为其主要景观类型，林地主要分布在坡度大于15°的较高海拔区域，耕地主要分布小坡度于25°的低海拔区域。根据地貌、景观类型以及行政边界，将洪雅县分为北部生活服务区、中部生产经济区和南部生态防护区，并提出了不同区域的生态规划重点。

anglais. Based on the medium resolution remote sensing image of Landsat_TM in October, 2010, the landscape pattern of Hongya County in 2010 were analyzed quantitatively though 9 landscape indexes, using RS, GIS and Fragstats 3.3. Meanwhile, distribution of landscape types was studied by topographic variation-based and divided into different function areas. The results showed that Hongya County belonged to mountain landscape, average patch area was 2.2245 hm2, landscape shape index was 137.46, patch density was 45 n/km2 and mean patch fractal dimension was 1.0629. Simple landscape shape, low landscape fragmentation degree and stable landscape pattern were the main characteristics of Hongya County. Forest and farmland were the dominant landscape types. Forest was distributed on the slopes with a gradient greater than 15 degree and farmland was distributed on the slopes with a gradient smaller than 25 degree. According to the terrain factors, landscape types and administrative boundary, three parts were divided, northern areawith living service function, middle area with product economy function and southern area with ecoprotection function. Finally, different ecological planning points were suggested for each area.