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利用NMS排序和主成分分析方法,分离乔木层变量成林分结构和林冠物种组成2个主成分,并以其作为林下植被的环境因子,检查了上层乔木对林下植被多样性、物种组成和集群格局的影响.结果显示林冠的物种组成与林下植被的Shannon多样性显著相关,而林分结构跟多样性没有直接的联系;林分结构和林冠组成均显著地影响了林下植被的物种分布,像杜英、千年桐、胡颓子、青冈、野柿、黄樟的分布跟林分结构紧密相关,半朔苣苔、华东安蕨、三叶木通、紫楠、香港四照花跟林冠组成紧密相关,然而林冠组成相对于林分结构解释了更多的物种分布;集群格局的零模拟分析还显示林冠组成显著地影响了林下植被的群落格局.本研究结果支持林冠组成是生态系统过程的主要驱动,也表明林冠组成是林下层群落格局形成的原因.
NMS ranking and principal component analysis were used to separate the tree layer variables into two main components of forest stand structure and canopy species composition. Based on their environmental factors, the effects of the upper tree on the diversity of understory vegetation, species composition And the cluster pattern.The results showed that the species composition of the canopy was significantly related to the Shannon’s diversity of understory vegetation, while the structure of the forest was not directly related to the diversity. The stand structure and canopy composition significantly affected the Species distribution, such as Du Ying, Millennium Tong, Elaeagnus, Cyclobalanopsis glauca, wild persimmon, camphor distribution is closely related with the stand structure, semi-moss moss, Huadong An fern, Cloverwood, Zi Nan, Hong Kong four photos of flowers Which is closely related to the composition of the canopy, however, the distribution of the canopy explains more species distribution relative to the stand structure. Zero simulation analysis of the cluster pattern also shows that the canopy composition significantly affects the community structure of the forest undergrowth. The main driving force of the ecosystem process also shows that the composition of the forest canopy is the reason for the formation of the forest community structure.