Abstract: By using the investigation data of red-crowned crane nest-sites in the Zhalong National Nature Reserve in 1996 and 2003-2007, the characteristics of the spatial distribution of the nest-sites were analyzed, and the topological index (Voronoi diagram area) was calculated. The results showed that the spatial distribution of red-crowned crane nest-sites featured in the form of spatial clustering. The nest-sites, residential areas, national highways, and railways in the reserve in 2006 were used as the objects to construct Voronoi diagrams, which better explained the influences of human activities on the spatial pattern of the nest-sites and would be beneficial to the protection of red-crowned crane habitats.

Key words: NaCl stress, Malus spp., Mineral nutrients