Ecotones have received great attention due to its critical function in energy flux, species harbor, global carbon sequestration, and land-atmosphere interaction. This study investigated land use pattern and spatial he...Ecotones have received great attention due to its critical function in energy flux, species harbor, global carbon sequestration, and land-atmosphere interaction. This study investigated land use pattern and spatial heterogeneity of the ecotones among agricultural land, forest land, and grassland of the southeastern Da Hinggan Mountains in the northeastern China. The change of these delineated ecotones under different slopes and aridity conditions was analyzed by two landscape indices, edge density(ED) and core area percentage of landscape(CPL), to explore the inter-linkage between spatial structure of ecotones and socioeconomic development and land management. Specifically, the ecotones such as agriculture-forest(AF) ecotone, forest-grassland(FG) ecotone, and agriculture-forestgrassland(AFG) ecotone moved from the arid southeast to the humid northwest. The flat area with small slope is more edge-fragmented than the steep area since the ED decreases as the slope increases. The AF ecotone mostly found in the humid region is moving to more humid areas while the agriculture-grassland(AG) ecotone mostly found in the dry region is moving towards the drier region.展开更多
A novel method for the generation of unstructured triangular surface meshes is presented.The method is based on remeshing techniques including edge splitting/contraction and edge swapping.Normalized edge lengths,based...A novel method for the generation of unstructured triangular surface meshes is presented.The method is based on remeshing techniques including edge splitting/contraction and edge swapping.Normalized edge lengths,based on a metric derived from curvature or from a user–specified spacing,are employed as the remeshing criterion.It is assumed that the geometry is input in the form of composite parametric surfaces,with Ferguson or Nurbs type multiple patch representation.Examples involving typical aircraft geometries and a ship model,are included to demonstrate how high quality meshes can be efficiently generated on surfaces with a high degree of geometric complexity.展开更多
基金Under the auspices of'Strategic Priority Research Program-Climate Change:Carbon Budget and Relevant Issues'of Chinese Academy of Sciences(No.XDA05090310)
文摘Ecotones have received great attention due to its critical function in energy flux, species harbor, global carbon sequestration, and land-atmosphere interaction. This study investigated land use pattern and spatial heterogeneity of the ecotones among agricultural land, forest land, and grassland of the southeastern Da Hinggan Mountains in the northeastern China. The change of these delineated ecotones under different slopes and aridity conditions was analyzed by two landscape indices, edge density(ED) and core area percentage of landscape(CPL), to explore the inter-linkage between spatial structure of ecotones and socioeconomic development and land management. Specifically, the ecotones such as agriculture-forest(AF) ecotone, forest-grassland(FG) ecotone, and agriculture-forestgrassland(AFG) ecotone moved from the arid southeast to the humid northwest. The flat area with small slope is more edge-fragmented than the steep area since the ED decreases as the slope increases. The AF ecotone mostly found in the humid region is moving to more humid areas while the agriculture-grassland(AG) ecotone mostly found in the dry region is moving towards the drier region.
文摘A novel method for the generation of unstructured triangular surface meshes is presented.The method is based on remeshing techniques including edge splitting/contraction and edge swapping.Normalized edge lengths,based on a metric derived from curvature or from a user–specified spacing,are employed as the remeshing criterion.It is assumed that the geometry is input in the form of composite parametric surfaces,with Ferguson or Nurbs type multiple patch representation.Examples involving typical aircraft geometries and a ship model,are included to demonstrate how high quality meshes can be efficiently generated on surfaces with a high degree of geometric complexity.
