PDF(Pubmed)
Abstract：
Plant-microbe-soil interactions control over the forest biogeochemical cycling. Adaptive plant-soil interactions can shape specific microbial taxa in determining the ecosystem functioning. Different trees produce heterogeneous soil properties and can alter the composition of soil microbial community, which is relevant to the forest internal succession containing contrasting stand types such as the pine-oak forests. Considering representative microbial community characteristics are recorded in the original soil where they had adapted and resided, we constructed a soil transplant incubation experiment in a series of in situ root-ingrowth cores in a subtropical pine-oak forest, to simulate the vegetational pine-oak replacement under environmental succession. The responsive bacterial and fungal community discrepancies were studied to determine whether and how they would be changed. The pine and oak forest stands had greater heterogeneity in fungi composition than bacteria. Original soil and specific tree root status were the main factors that determined microbial community structure. Internal association network characters and intergroup variations of fungi among soil samples were more affected by original soil, while bacteria were more affected by receiving forest. Specifically, dominant tree roots had strong influence in accelerating the fungi community succession to adapt with the surrounding forest. We concluded that soil microbial responses to forest stand alternation differed between microbiome groups, with fungi from their original forest possessing higher resistance to encounter a new vegetation stand, while the bacteria community have faster resilience. The data would advance our insight into local soil microbial community dynamics during ecosystem succession and be helpful to enlighten forest management.
摘要：
植物-微生物-土壤相互作用控制森林生物地球化学循环。适应性植物-土壤相互作用可以在决定生态系统功能时塑造特定的微生物类群。不同的树木产生异质性的土壤特性，并可以改变土壤微生物群落的组成，这与包含不同林分类型的森林内部演替有关，例如松树-橡树林。考虑到代表性的微生物群落特征记录在它们适应和居住的原始土壤中，我们在亚热带松橡树林中的一系列原位根向内生长核心中构建了土壤移植孵化实验，模拟环境演替下的植被松树-橡树替代。研究了响应性细菌和真菌群落差异，以确定是否以及如何改变它们。松树和橡树林分的真菌组成比细菌具有更大的异质性。原始土壤和特定的树木根系状况是决定微生物群落结构的主要因素。土壤样品中真菌的内部关联网络特征和群体间变异受原始土壤的影响更大，而细菌受接收森林的影响更大。具体来说,优势树根对加速真菌群落演替以适应周围森林有很强的影响。我们得出的结论是，土壤微生物对林分交替的响应在微生物组之间有所不同，来自原始森林的真菌对遇到新的植被具有更高的抵抗力，而细菌群落具有更快的复原力。这些数据将增进我们对生态系统演替过程中当地土壤微生物群落动态的了解，并有助于启发森林管理。
