Abstract：
Soil parent material is the second most influential factor in pedogenesis, influencing soil properties and microbial communities. Different assembly processes shape diverse functional microbial communities. The question remains unresolved regarding how these ecological assembly processes affect microbial communities and soil functionality within soils on different parent materials. We collected soil samples developed from typical parent materials, including basalt, granite, metamorphic rock, and marine sediments across soil profiles at depths of 0-20, 20-40, 40-80, and 80-100 cm, within rubber plantations on Hainan Island, China. We determined bacterial community characteristics, community assembly processes, and soil enzyme-related functions using 16S rRNA high-throughput sequencing and enzyme activity analyses. We found homogeneous selection, dispersal limitation, and drift processes were the dominant drivers of bacterial community assembly across soils on different parent materials. In soils on basalt, lower pH and higher moisture triggered a homogeneous selection-dominated assembly process, leading to a less diverse community but otherwise higher carbon and nitrogen cycling enzyme activities. As deterministic process decreased, bacterial community diversity increased with stochastic process. In soils on marine sediments, lower water, carbon, and nutrient content limited the dispersal of bacterial communities, resulting in higher community diversity and an increased capacity to utilize relative recalcitrant substrates by releasing more oxidases. The r-strategy Bacteroidetes and genera Sphingomonas, Bacillus, Vibrionimonas, Ochrobactrum positively correlated with enzyme-related function, whereas k-strategy Acidobacteria, Verrucomicrobia and genera Acidothermus, Burkholderia-Caballeronia-Paraburkholderia, HSB OF53-F07 showed negative correlations. Our study suggests that parent material could influence bacterial community assembly processes, diversity, and soil enzyme-related functions via soil properties.
摘要：
土壤母质是影响成岩作用的第二大因素，影响土壤特性和微生物群落。不同的组装过程形成了不同的功能微生物群落。关于这些生态组装过程如何影响不同母体土壤中的微生物群落和土壤功能的问题仍未解决。我们收集了典型母体材料的土壤样本，包括玄武岩,花岗岩,变质岩,和海洋沉积物在0-20、20-40、40-80和80-100厘米深度的土壤剖面上，在海南岛的橡胶种植园内，中国。我们确定了细菌群落特征，社区集会过程，和土壤酶相关功能使用16SrRNA高通量测序和酶活性分析。我们发现了同质的选择，扩散限制，漂移过程是细菌群落在不同亲本土壤中聚集的主要驱动因素。在玄武岩上的土壤中，较低的pH值和较高的水分触发了一个均匀的选择主导的组装过程，导致群落多样性较少，但碳和氮循环酶活性较高。随着确定性过程的减少，细菌群落多样性随随机过程而增加。在海洋沉积物上的土壤中，较低的水，碳,营养含量限制了细菌群落的扩散，通过释放更多的氧化酶，导致更高的群落多样性和探索相对顽固底物的能力增加。r策略拟杆菌和鞘氨醇单胞菌属，芽孢杆菌,弧菌,苍白杆菌与酶相关功能呈正相关，而k-strategy酸细菌，Verrucomicrobia和酸热菌属，伯克霍尔德菌-卡瓦列尼亚-帕拉布尔霍尔德菌,HSBOF53-F07呈负相关。我们的研究表明，母体材料可以影响细菌群落组装过程，多样性,通过土壤特性和土壤酶相关功能。
