基于样线法的景观异质性的尺度效应研究——以甘肃省临夏市为例

Scale effect of landscape heterogeneity based on line transect method——A case study on Linxia City of Gansu Province

【目的】分析研究甘肃省临夏市景观格局异质性的尺度效应.【方法】在GIS支持下,以土地利用现状图作为基本信息源,应用平均信息量、初始信息量、终止信息量、聚合信息量等一些基于样线法的指标对景观异质性的尺度效应进行分析研究.【结果】农业用地为研究区景观结构的基质;廊道包括交通用地和水体;其余景观组分均为斑块.随着观测尺度(粒度)不断增大,各景观组分的信息量指标均呈现出逐渐减小的趋势,具有明显的尺度依赖性.在较小的观测粒度下,各景观组分的参数差异较大,当观测粒度大于608m时,景观组分的空间分布开始趋于均匀,景观异质性的尺度效应不明显.【结论】608m为样线法研究景观格局粒度效应的有效粒度.

【Objective】To study the scale effect of landscape heterogeneity in Linxia City of Gansu Province.【Method】The present land-use map is taken as the data source based on GIS technology,some indicators are applied related to line transect methods such as average information quantity,initial information quantity,termination information quantity and aggregated information quantity to analyze the scale effect of landscape heterogeneity.【Result】Agricultural landscape is the matrix of landscape structure in the studied area,traffic landscape and water landscape play the corridor role,and the other landscape elements acted as patches.With the increase of the observation scale(grain size),the information quantity indexes of each landscape component shows a decreasing trend,which means the landscape heterogeneity and the observational scale are dependent.The heterogeneity parameters of each landscape elements are quite different in small grain size,the spatial distribution of some landscape components began to be homogeneous when the scale increased to608m.【Conclusion】608m is the effective scale for the study of the scale effect of landscape pattern.