4.2. Different assembly progress of abundant and rare
Bathyarchaeial taxa in paddy soils
NCM results indicated that stochastic processes dominated the archaea
community assembly in paddy soils.
The results from the NCM revealed
that abundant Bathyarchaeia ASVs exhibit higher migratory
capabilities within paddy soils and experience less dispersal
limitation, implying a broader distribution range and a greater
propensity for colonization within these soils (Chen & Wen 2021). The
null model also indicated that Bathyarchaeia displays a wider
niche breadth at the class level compared to other archaea in paddy
soil. A broader niche breadth signifies that Bathyarchaeiapossesses a heightened ability to adapt to various environments,
accompanied by metabolic versatility, which in turn results in a
widespread and abundant distribution pattern (Chen et al. 2019; He et
al. 2022; Pandit et al. 2009). This characteristic is also supported by
previous studies indicating that Bathyarchaeia were detected in
various environments and were suggested to show multiple metabolisms.
NCM results also showed that most low abundant Bathyarchaeia(87.0% of ASVs) fitted the neutral model. Soil nutrients in arable
soils can decrease the effect of environmental filtering for microbial
distribution (Shu et al. 2021). Due to fertilization practice, paddy
soils contain much higher nutrients than other environmental habitats,
which increases the importance of stochastic processes inBathyarchaeia community assembly and affects rareBathyarchaeia taxa.