大果沙棘人工林种群结构点格局分析

根据对孙吴县大河口林场大果沙棘样地的调查结果,通过采用点格局分析法对大果沙棘人工林单种群、种群内不同发育阶段大果沙棘个体的分布格局与空间关联性进行了研究.结果表明,大果沙棘人工林单种群的空间点格局在所研究的尺度呈显著集群分布;不同林龄大果沙棘个体点格局在研究尺度主要表现出集群分布,并在一定的尺度范国内表现出随机分布;在种群不同发育阶段的关联性上,邻近的发育阶段在小尺度范围内表现为负相关,表明其存在种间竞争,在大尺度范围表现出无关联性,表明其相互关系并不协调,只有其中某几个发育阶段表现出正相关的关系.依靠点格局方法分析不同尺度的格局,存在明显的优越性.

Point Pattern Analysis of the Population Patterns of Hippophae rhamnoides Linn. Variety from Russia

To research the Hippophae rhamnoides Linn.variety from Russia in Dahekou forest farm in Sunwu County,with the method of point pattern analysis,the plantation population of the Hippophae rhamnoides Linn.variety from Russia,the different-age classes of individual distribution pattern and spatial associations were studied.The results showed that the plantation population of the point pattern analysis under the scales are distinct cluster distribution.In different-age classes Hippophae rhamnoides Linn.variety from Russia individual point pattern in the pattern under the main scales show cluster distribution and under certain scale showed random distribution.During the population of differentage,the relevance of neighboring-age under small scale turn to be negative correlation which existed competition between species,under large scale turn to be without relevance,show the relationship is not harmonious,from which only a few plantation age showed positive correlation relationship.On the methods to analyze the pattern in different scales of pattern have obvious superiority.