安宁市土地资源景观格局现状分析与评价

以安宁市为研究对象,以Landsat ETM遥感影像和基础地理信息数据为信息源,采用斑块平均面积、形状指数、分维数、香农多样性指数、均匀度指数和优势度指数等指标,对安宁市土地资源景观格局进行研究.结果表明:安宁市景观的主要斑块类型为农田、云南松和地盘松;分维度表明水域和荒地在人类的改造过程中形状呈现规则化,公路景观的形状呈现复杂化,反映出人类活动对原有自然景观的干扰特征;香农多样性指数表明景观类型丰富,异质性高;均匀度指数表明景观中有一定的优势类型,以农田、云南松和地盘松等景观类型占优势.

Analysis and Appraisal on the Present Status of Landscape Pattern of Land Resources in Anning Municipality

Based on the information from Landsat ETM images and fundamental geographical information data,the present landscape patterns of land resources in Anning Municipality were analyzed by means of the RS and GIS technology and by applying the mean matrix area,contour index,fractal dimension,Shannon-weiner diversity index,shannon-weiner evenness index and the dominance index as the study indices.It was showed by the results that the principal matrixes of the landscape pattern in Anning were the farmland,pinus yunnanensis forest and Pinus yunnanensis var.pygmaea forest lands.The fractal dimension index indicated that the shapes of water bodies and wasteland became more regular,while the road landscape form became more complicated along with the transformation process,showing that the primary natural landscape were greatly disturbed by human activities.SHDI showed that there were varied landscape types indicating high heterogeneity,while SHEI showed that farmland and forests of Pinus yunnanensis and Pinus yunnanensis var.pygmaea were the dominant landscape types in Anning Municipality.