Population Structure and Spatial Pattern of Ulmus macrocarpa var.mongolica in Horqin Sandy Land,China
科尔沁沙地蒙古黄榆种群结构与空间分布格局

Based on an investigation into the Ulmus macrocarpa var.mongolica sparse forest in the Horqin Sandy Land,its population characteristics and spatial distribution were analyzed from aspects of static life table,mortality curve,age structure diagram and point pattern analysis diagram.The results showed:(1) The woody layer of the Ulmus macrocarpa sparse forest develops incompletely with single species,and the shrub layer appears sparsely,too.(2) The age structure of the Ulmus macrocarpa population is seriously ...