Han An-Xia, Qiu Jing, He Chun-Mei, Yin Qiu-Long, Jia Shi-Hong, Luo Ying, Li Chen-Lu, Hao Zhan-Qing
College of Ecology and Environment, Northwestern Polytechnical University, Xi'an 710129, China.
Ying Yong Sheng Tai Xue Bao. 2022 Aug;33(8):2027-2034. doi: 10.13287/j.1001-9332.202208.003.
In this study, the spatial distribution patterns of individuals with different diameter classes of dominant shrub var and the intraspecific and interspecific relationships were analyzed in Qinling Huangguan Plot. The results showed that the diameter class structure of var showed a pyramid shape, with a wide bottom and a narrow top. The number of small-diameter class individuals was the largest, showing a good state of renewal and a stable growth, which was conducive to community renewal and succession. Based on Ripley's function, using univariate and bivariate paired correlation functions, under complete spatial randomness model, heterogeneous Poisson model and antecedent condition model, all individual of the species and their diameter-dividing classes were mainly aggregated, and the aggregation degree decreased with the increases of research scale, and gradually tended to random distribution. Affected by habitat heterogeneity, diffusion restriction and negative density dependence, there was a positive correlation among different intraspecific dia-meter classes, and also a certain degree of no correlation, but without negative correlation. The interspecific relationship was complex. All types of association (no, positive and negative) were observed, but negative association and no association were dominated.
本研究在秦岭皇冠样地分析了优势灌木太白杜鹃不同径级个体的空间分布格局及其种内和种间关系。结果表明，太白杜鹃的径级结构呈金字塔形，基部宽顶部窄。小径级个体数量最多，更新状态良好且生长稳定，有利于群落更新和演替。基于Ripley's函数，采用单变量和双变量配对相关函数，在完全空间随机模型、异质泊松模型和前期条件模型下，该物种的所有个体及其径级划分类主要呈聚集分布，聚集程度随研究尺度的增大而降低，并逐渐趋于随机分布。受生境异质性、扩散限制和负密度依赖的影响，不同种内径级之间存在正相关，也有一定程度的不相关，但无负相关。种间关系复杂。观察到了所有类型的关联（无、正和负），但以负关联和无关联为主。
