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Soil microorganisms play vital roles in regulating biogeochemical processes. The composition and function of soil microbial community have been well studied, but little is known about the responses of bacterial and fungal communities to different habitats of the same plant, especially the inter-kingdom co-occurrence pattern including bacteria and fungi. Herein, we used high-throughput sequencing to investigate the bacterial and fungal communities of five Phragmites australis habitats in the Yellow River Delta and constructed their inter-kingdom interaction network by network analysis. The results showed that richness did not differ significantly among habitats for either the bacterial or fungal communities. The distribution of soil bacterial community was significantly affected by soil physicochemical properties, whereas that of the fungal community was not. The main functions of the bacterial and fungal communities were to participate in the degradation of organic matter and element cycling, both of which were significantly affected by soil physicochemical properties. Network analysis revealed that bacteria and fungi participated in the formation of networks through positive interactions; the role of intra-kingdom interactions were more important than inter-kingdom interactions. In addition, rare species acted as keystones played a critical role in maintaining the network structure, while NO3−−N likely played an important role in maintaining the network topological properties. Our findings provided insights into the inter-kingdom microbial co-occurrence network and response of the soil microbial community composition and function to different P. australis habitats in coastal wetlands, which will deepen our insights into microbial community assembly in coastal wetlands.

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Aims Tamarix chinensis is a pioneering shrub species in temperate coastal saline wetlands, which plays an important role in plant community succession and preventing seawater intrusion in coastal wetlands. This study, which is focused on Tamarix chinensis population distribution characteristics and the correlations between Tamarix chinensis population distribution with individual diameters, can reveal the characteristics of population development and provide reference for species conservation and management of protected areas. This study may also provide basic information for scientific research on the succession and ecological management of coastal wetland vegetation ecosystems. MethodsIn the core area of Changyi National Marine Ecological Special Protection Zone, two sample tapes with a spacing of about 800 m are arranged along the parallel coastline. Each sample tape has three plots of 50 m × 50 m. A total of six sample plots are set up for each wood survey. The spatial distribution map of Tamarix chinensis population is drawn by Origin. The obtained data is divided into three different diameter grades according to their base diameter: diameter grade I (base diameter ≤ 4 cm) and diameter grade II (4 < base diameter ≤ 8 cm), diameter grade III (base diameter > 8 cm). The distribution pattern of Tamarix chinensis population and the relationship between different diameter grades are analyzed by the point pattern analysis method and Programita software.