毛乌素沙地新疆杨种群的点格局分析

Point Pattern Analysis of Populus bolleana Population in Mu Us Sandy Land

根据宁夏毛乌素沙地2块20 m×20 m的新疆杨样地实地调查结果,采用点格局分析方法对毛乌素沙地的新疆杨种群的空间分布格局和空间关联性进行了研究。结果表明,在较小空间尺度（0~3 m）上,新疆杨种群的空间分布表现为显著的非随机分布;当空间尺度大于临界值（9 m）时,新疆杨种群的空间分布呈现随机分布趋势;不同大小等级的新疆杨在空间关联性上表现为负相关。

According to the field investigation results from 2 Populus bolleana sample plots with the area of 20 m × 20 m in Ningxia Mu Us Sandy Land,and point pattern analysis was used to study the spatial distribution patterns and spatial association of Populus bolleana population in Mu Us Sandy Land.The results indicated that in smaller spatial scale（0-3 m）,the spatial distribution of Populus bolleana population presented significant nonrandom distribution;when spatial scale was greater than critical value（9 m）,the spatial distribution of Populus bolleana population presented random distribution trend;different size classes of Populus bolleana population in spatial association showed negative correlation.