基于GIS的临沂市土地利用景观格局梯度分析

GIS-Based Gradient Analysis on Landscape Pattern of Land Use in Linyi City

以临沂市2010年土地利用数据为基础,利用景观格局梯度法和GIS空间分析法初步分析了研究区土地利用总体景观格局特征和空间分异特征。结果表明:临沂市的景观结构中,耕地为优势景观,约占整个景观比例的50%,其次是建设用地和林地。类型水平上的景观格局指数分析表明,各种景观类型沿着缓冲区梯度方向表现出独特的空间特征;景观水平的格局分析表明,从市区到郊区,斑块破碎化程度逐渐升高,斑块的形状也趋于复杂,景观多样性增强。同时,研究结果也表明,景观格局指数结合梯度分析,是检测城市形态的有力工具。

Taking the present land use data of Linyi city in 2010as the main information source,based on the landscape index and GIS spatial analysis method,the general pattern of land use landscape characteristics and spatial distribution rules in Linyi city were analyzed and discussed.The results showed that the dominant pattern of the landscape in Linyi city was farmland,the proportion of its total area nearly accounts for 50percent of all sub-areas,followed by construction land and forestland.Different landscape types exhibited distinctive spatial signatures along the gradient buffer zones with class-level landscape indices.Analysis of landscape level pattern showed that patch fragmentation gradually increased from the city to suburb,the shapes of landscape became more complicated,landscape tended to be more diverse.The results suggest that combination of landscape metrics and gradient analysis is a robust tool to study the spatial pattern of urbanization.