The floodplain ecosystem plays an important role in the mediation or regulation of regional ecological functions, and is the heart of ecosystem functions based on soil microbial communities. In the present study, we investigate the patterns and assembly processes of soil microbial communities along nine profile depths (up to 280 cm in depth) of three stages of floodplain community succession (channel bar, newly deposited river beach and tender floodplain) and farmland in the floodplain of the lower Yellow River. Generally, the bacterial community in agricultural soil had the highest diversity, whereas the archaeal community in the tender floodplain had the highest diversity. Compared to bacteria, the co‐occurrence network of archaea was more complex and stable and had high connectivity. Our data suggest that the resistance of bacteria and archaea to environmental changes in deep soil was higher when compared to that in surface soil. Furthermore, stochastic and deterministic processes acted concurrently to regulate the assembly of the soil microbial community in the floodplain ecosystems. However, the relative contributions of the stochastic process and deterministic process are different between the bacterial community and the archaeal community. The lowest contribution of the stochastic process in the bacterial community was in the subsoil, whereas in the archaeal community, it was the opposite. For ecological selection, bacterial communities in different soil profiles, in the succession stages and in the farmland, were mainly selected through homogeneous selection, whereas archaeal communities were selected through heterogeneous selection. Compared with the three floodplain succession stages, the microbial communities of agricultural lands were more assembled by deterministic processes.

中文翻译：

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黄河滩区土壤原核群落随机性和确定性过程的定量估计。

漫滩生态系统在区域生态功能的调节或调节中起着重要作用，并且是基于土壤微生物群落的生态系统功能的核心。在本研究中，我们调查了三个阶段的洪泛区群落演替（河道，新沉积的河滩和嫩洪泛区）和农田中九个剖面深度（深度达280 cm）的土壤微生物群落的模式和聚集过程。黄河下游的洪泛区。通常，农业土壤中的细菌群落具有最高的多样性，而嫩洪泛区中的古细菌群落具有最高的多样性。与细菌相比，古细菌的共现网络更为复杂和稳定，并且具有很高的连通性。我们的数据表明，与表层土壤相比，深层土壤中细菌和古细菌对环境变化的抵抗力更高。此外，随机过程和确定性过程同时起作用，以调节洪泛区生态系统中土壤微生物群落的组装。但是，细菌群落和古细菌群落之间随机过程和确定性过程的相对贡献是不同的。在细菌群落中，随机过程的最低贡献是在土壤中，而在古细菌群落中，则相反。为了进行生态选择，主要通过均质选择来选择不同土壤剖面，演替阶段和农田中的细菌群落，而古细菌群落是通过异质选择而选择的。与三个洪泛区演替阶段相比，农田的微生物群落通过确定性过程组装得更多。