Spatial characteristics of farmland and residential land in dry valley of Minjiang River upper reaches
岷江上游干旱河谷耕地和居民用地的空间特征

By using FRAGSTATS 3.3 software,this paper calculated the total area,patch number,patch density,and fractal dimension of the farmland and residential land in dry valley of Minjiang River upper reaches based on the spatial neighboring properties of the farmland and residential land analyzed by ARCMAP 9.0 and the relationships between their distribution and topographic factors altitude and slope studied based on DEM.The results showed that shrub land was the landscape radix of the dry valley.The farmland and residential land in the valley had small mean patch size and patch density,and their shapes were simple.Most farmlands were distributed on the steep slopes at the elevations ranging from 1 700 to 3 000 m,and adjacent to shrub land patches.Residential patches had far distances among each other,with a relatively dense distribution at low altitude,but very sparse distribution at high altitude.The spatial distribution pattern of residential land was most affected by that of farmland.