基于RS和GIS的安宁市景观格局动态变化分析

利用1996年和2003年两期遥感数据,在GIS技术和Fragstats软件的支持下,运用景观生态学原理,采用斑块面积、斑块数、斑块密度、形状指数、面积周长分维度指数、聚集度指数、结合度指数、蔓延度指数、香农多样性指数和均匀度指数等从景观类型水平和景观水平对安宁市景观格局的动态变化进行了分析。结果表明,在类型水平上,安宁市的农业用地和荒地面积减少,而林地和水域面积增加,反映出近年来安宁市开展开荒造林和退耕还林工程的成效;从景观水平上来看,景观多样性提高,且趋于均匀,单类型景观占主导地位的程度降低;从斑块密度、分维度指数和蔓延度指数进行分析表明,景观破碎程度增大,斑块形状趋于复杂化,斑块间趋于离散,反映出人类活动对景观格局的干扰特征。

Analysis on dynamical change of landscape pattern in Anning city based on RS and GIS

Using GIS and Fragstats,dynamics change of landscape pattern have been analyzed on the landscape and class level in Anning city,which are based on remote sensing images in 1996 and 2003.In this paper,ten indexes were used,including patch area,patch density,contour index,perimeter-Area fractal dimension,Aggregation Index,Patch Cohesion Index,Contagion,Shannon-weiner diversity index and shannon-weiner evenners index.The results show,on the class level,farmland and wasteland's area was decreasing,while forest and water's area was increasing.Diversity index show that all kinds of Landscape pattern trend to evenness distribution,and the shape of the landscape become much more complicated and discrete on the landscape level.Also,the trend of the single landscape demonstrate in this area was decreased.It was show that the landscape was much fragmentized from the result of patch desity,perimeter-Area fractal dimension and Contagion.