植物群落可以自由地聚集，并且，它们的特殊结构由该区域的具体历史情况所决定。
Plant communities assemble themselves flexibly, and their particular structure depends on the specific history of the area.
第一个和第三个可能是生物群落结构的关键因素；也就是说，所有的生物种群都生活在一起，并且它们可能在一个特定的区域内相互作用。
The first and the third can be key factors in the structure of a biological community; that is, all the populations of organisms living together and potentially interacting in a particular area.
环境因素的影响以及在元社区水平上研究群落系统发育有助于理解区域生态进程。
The influence of environmental factors and studying community phylogeny at the metacommunity level helps to understand regional ecological processes.
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