内蒙古皇甫川五分地沟小流域土地覆盖空间格局特征及其持续性分析

基于1979、1987和2002年3个时期的土地覆盖类型图,从斑块面积、形状、空间关系3方面着手,利用斑块面积百分比、面积变异系数、分维数3个景观格局指数对内蒙古皇甫川五分地沟小流域的土地覆盖格局及变化特征进行研究;并以流域为尺度,测算土地覆盖破碎度、多样性指数、分维数、合理性指数4个指标随时间变化的持续性。结果表明:研究区土地覆盖现状呈现各类型相对较均衡的镶嵌状分布格局,土地覆盖类型较稳定,斑块形状较简单,受人类干扰较大。土地覆盖特征指数的持续性分析结果与对应的指标分析结果相吻合。

Spatial pattern and sustainability of the land-cover of Wufendigou Catchment,Huangfuchuan,Inner Mongolia.

Based on land-cover information obtained from the land-cover type maps of 1979,1987 and 2002,three landscape indices,such as percentage of a patch in area,fractal dimension and area variation coefficient,of the studied catchment were analyzed to determine land-cover pattern and its dynamic characteristics,including patch area,shape of patches and spatial relationship during the past twenty years.Sustainability of four indices,i.e.fragmentation index,diversity index,fractal dimension,and relative reasonability of land-cover at the catchment level is simulated.The results indicate that the pattern of land-cover in the Wufendigou Catchment tended to be a relatively stable landscape structure of mosaic,which is quite stable in land-cover type,simple in patch shape and subject to greater human interference.The sustainability analysis of land-cover characteristics showed a result quite identical with that of the analysis of their corresponding indices.