互花米草克隆基株网络的随机游走特征

Random Walk on the Clonal Network of Spartina Alterniflora

基于野外实地调查的数据和复杂网络理论,分别定义4种形式的节点和4种类型的边,然后构建了具有异配性的互花米草基株多重关系网络。为了研究互花米草多重关系网络的拓扑结构和动态特性,建立了具有多个陷阱节点的随机游走模型。数值仿真结果显示:在随机游走过程中,无穗株丛和无穗分株是控制节点平均吸收时间的主要因素。经分析可知,建构的互花米草基株的水平空间扩散网络模式反映了其真实生境异质性模式。此外,该模型对于分析其它种类克隆植物的异质生境格局具有借鉴意义。

Trapping process constituted a primary problem of random walks.Based on the field survey data and the theory of complex network,four types of nodes and four types of edges were defined,and then the multiple relationship networks of Spartina alterniflora genets were constructed,which showed disassortativity.In order to explore the topological and dynamic characteristics of the multiple relationship networks of S.alterniflora genets,the random walk models with multiple traps were established.The simulation result showed that the bunches and the ramets without spikes were the major regulatory nodes of ATT in the random walks.We concluded that the horizontal spatial diffusion network patterns of S.alterniflora genets revealed by the models reflected their habitat heterogeneity patterns.Furthermore,this type of models might generally provide a reference for the analysis on the heterogeneity patterns of the habitats of other clonal plants.