甘肃永登县土地利用景观格局的空间尺度效应

依据“斑块-廊道-基质”模式,研究了甘肃省兰州市永登县景观格局的空间尺度效应.结果表明:草地为整个研究区景观结构的基质;廊道包括道路和河流;其余景观组分(耕地、林地、园地,住宅用地、工矿用地、公共管理与服务用地和其他土地)均为斑块.斑块类型水平指数与景观水平指数均表现出明显的空间幅度依赖性.不同景观组分的斑块类型指数的尺度效应在不同幅度区间存在差异性,景观水平指数的尺度效应在不同幅度区间也存在差异性.在1～20 km幅度区间,尺度效应的组分类型、指标类型之间差异最为明显;在21～90 km幅度区间,尺度效应的组分类型、指标类型之间差异较小;在>90 km幅度后,尺度效应消失.90 km×90 km为研究景观格局尺度依赖性的有效幅度.

Spatial scale effect of land use landscape pattern in Yongdeng County,Gansu Province,China.

Based on “patch-corridor-matrix” pattern, spatial scale effect of landscape pattern was studied in Yongdeng County of Lanzhou City, Gansu Province, China. The results showed that the grassland was the matrix of landscape structure in the studied area, road and river played the corridor role, and the other landscape elements (cultivated land, forest land, garden land, residential land, industrial and mineral land, public management and service land, and the other land) acted as patches. The patch level index and the landscape level index all showed obvious dependence on spatial extent. The scale effect of patch index of different landscape elements existed differently in different extent intervals, so did the scale effect of the landscape level index. Within the extent of 1-20 km, the scale effect showed the most obvious difference between the element types and the index types, while it became smaller in 21-90 km, and disappeared beyond 90 km. 90 km×90 km might be the effective extent to study the dependence of spatial extent of landscape structure.