冀北山地杨桦次生林空间点格局分析

杨桦次生林是冀北山地具有代表性的次生林植被类型,其空间分布格局的研究,可为该地区的天然次生林保护、恢复与可持续经营提供理论依据和参考。本试验在河北省木兰围场桃山林场,选择典型的杨桦次生林布设100m×100m样地,采用点格局分析方法分析杨桦次生林群落和主要种群的空间分布格局及种间关联关系。结果表明:冀北山地杨桦次生林群落在小尺度范围内呈聚集分布,在大尺度范围内呈随机分布;白桦、山杨和棘皮桦的单种格局在小尺度范围内呈聚集分布,在大尺度范围内呈随机分布;平基槭在研究的尺度范围内,均呈聚集分布;白桦与山杨、平基槭、棘皮桦之间都呈现为一定的正关联;山杨与平基槭、棘皮桦之间,小尺度呈现正关联,大尺度呈现负关联;平基槭与棘皮桦呈现为显著的正关联。

Point pattern analysis of secondary poplar-birch forest in the mountainous regions of northern Hebei

Secondary poplar-birch forest is the typical secondary vegetation in the mountainous regions of northern Hebei,and the research of spatial distribution pattern of this forest can provide the oretical foundation and reference for protection,restoration,sustainable management of natural secondary forests in the area.In this paper,a plot of 100 m×100 m was surveyed in a selected typical secondary poplar-birch stand in Taoshan Forest Farm of Hebei,and point pattern analysis was used to analyze its spatial distribution pattern,interspecific association of secondary poplar-birch forest community and main population.Results showed that secondary poplar-birch forest community is aggregated at small scale but randomly distributed at large scale.Single species distribution patterns of Betula platyphylla,Populus davidiana and Betula dahurica are also aggregated at small scale but randomly distributed at large scale.A.truncatum is aggregated at all scales of this research.Betula platyphylla is positively associated with Populus davidiana,A.truncatum and Betula dahurica.Populus davidiana is positively associated with A.truncatum and Betula dahurica at small scale but negatively at large scale.A.truncatum and Betula dahurica are significantly and positively associated with each other.