乌斯吐自然保护区乔木格局及草本多样性研究

Study on Spatial Distribution Pattern of Arbors and Diversity of Herbaceous Species in the Usytu Nature Reserve

运用点格局分析方法,对乌斯吐自然保护区5块样地内乔木空间格局进行分析,结果表明:集群分布为该地乔木主要的空间格局,样地a、样地e在所有空间尺度下均呈现显著的集群分布格局,样地b、样地d在较小的空间尺度下(r<8 m)呈现随机分布;而在较大的空间尺度下仍然呈现集群分布,只有样地c在所有尺度下都呈现随机分布。采用6个不同的多样性指数对林下草本多样性进行分析,结果表明:该地草本物种多样性表现出与乔木空间格局具有显著的关联性,即乔木呈现集群分布的样地内,草本多样性较高。

In this paper,the spatial distribution pattern of arbors in 5 plots in the Usytu Nature Reserve was studied using the method of point pattern analysis.The results showed that the contagious distribution was the main spatial distribution pattern in the study area.A significant cluster distribution occurred in plot a and e under all the spatial scales;a random distribution occurred in plot b and d under small scale（r8 m）,but a cluster distribution occurred under large scale;a random distribution occurred in plot c under all scales.Diversity of herbaceous species under forest was analyzed using six different diversity indexes,the results revealed that there was a significant correlation between the diversity of herbaceous species and the spatial distribution pattern of arbors,that is the diversity of herbaceous species in the plots where a cluster distribution of arbors occurred was higher than that in the plots where a random distribution of arbors occurred.