阿拉善典型荒漠群落种群空间格局及种间关联的尺度依赖性

Scale Dependence of Spatial Distribution Pattern and Association of a Typical Community in Alashan Desert

以阿拉善典型绵刺+泡泡刺+驼绒藜荒漠群落灌木层片为研究对象,分析了灌木层片数量特征,并运用点格局分析方法对主要灌木种群绵刺、泡泡刺、驼绒藜种群空间分布格局及空间关联性进行了研究.结果表明:在绵刺+泡泡刺+驼绒藜(重要值分别为41.67%、30.24%和27.52%)典型荒漠群落中,三种灌木种群空间格局在小尺度(0-3.6m)上呈均匀分布或具有均匀分布趋势,显示种内存在竞争关系,但随着尺度增大(3.6~20m)种群格局转变为随机分布;在0~20m连续空间尺度上种间空间关联性基本表现为空间无关联,但随空间尺度增大种间负关联性有增强趋势,显示种间仍表现出弱的竞争关系.

The community quantity characteristics of a special plant synusiae were analyzed which formed by Potaninia mongolica ,Nitraria sphaerocarpa and Krascheninnikovia ceratoides in the southeast of the Badain Jaran Desert, Alashan League, Inner Mongolia. Point patterns analysis were used to study the population spatial distribution pattern and spatial relevancy of P. mongolica, N. sphaerocarpa and K. ceratoides. The results were as follows. 1） The important value of P. mongolica, N. sphaerocarpa and K. ceratoides were 41.67 %, 30.24 % and 27.52 %, respectively. 2） At small scale （0-3.6m）, the spatial distribution pattern of P. mongolica, N. sphaerocarpa and K. Ceratoides was uniform type. However,with the increasing of scale （3.6-20 m）,the three species displayed a tendency of random distribution. 3） Within 0-20 m continuous spatial scale, the three arbor-shrub populations showed no apparent spatial relevancy, while the spatial relevancy became more negative with increase of scale showing weak competition.