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采用空间点格局分析方法中的Ripley K函数,将宏观的地理环境与微观的点格局相结合,分析了不同尺度下黑河下游胡杨种群的空间分布格局.结果表明:胡杨种群密度随离河距离增大而减小,且东河胡杨种群密度整体上高于西河;胡杨种群分布格局随空间尺度的变化而变化,主要在中尺度5~12 m呈聚集分布,在小尺度0~2 m和大尺度38~40 m呈随机分布,极少呈均匀分布;胡杨种群在不同离河距离主要呈聚集分布,且聚集强度随离河距离的增大呈增大趋势,而胡杨种群在离河距离较远的地段有扩散趋势,转为随机分布.表明胡杨种群内部的生态联系对空间尺度具有很强的依赖性,胡杨种群空间分布主要受表层土壤含水量和地下水埋深的影响.
The spatial distribution pattern of Populus euphratica populations in the lower reaches of the Heihe River at different scales was analyzed by using the Ripley K function in the spatial point pattern analysis method. The results showed that Populus population density increased with increasing distance from the river Populus euphratica population density is generally higher than that of the Xijiang River. Populus euphratica population distribution pattern changes with the spatial scale, mainly in the 5 ~ 12 m mesoscale aggregation distribution, small scale 0 ~ 2 m and large The distribution of Populus euphratica Populations mainly distributed randomly in the range of 38-40 m. Populus euphratica populations mainly distributed in different distance from the river, and the intensity of aggregation increased with the increase of the distance from the river. Populus euphratica population had a greater distance from the river The distribution of the Populus euphratica population is mainly influenced by the surface soil moisture content and groundwater depth.