Richness contributes higher on soil microbial community resistance while nutrient contributes higher on resilience to a thermal stress

Soil microbial communities play irreplaceable roles in regulating environment. However, global climate change induced extreme weather events were reported capable reshape microbial community composition, which exert possible influences on the environment regulation function. Unfortunately, the compositional response of microbial community to extreme weather events and the potential factors regulating this response were still scarcely explored up to date. To fill the gap, here we sampled soils from 5 different type ecosystems and conducted a simulated extreme high-temperature stress experiment. The results showed that the complex ecosystems (like forests) had higher richness reduction than simple ecosystems (like bare land) during stress stage, most bacterial community richness kept decreasing while most fungal community richness were relatively unchanged during recovery stage. Despite the fungal communities in different types of ecosystems showed different and specific changes in the face of stress during the stress and recovery stage, the relative abundances of α- Proteobacteria were enhanced by stress in simple ecosystems but decreased in complex ecosystems, and the recovery stage of simple ecosystems were characterized by the trade-off between α-, β- and γ- Proteobacteria while complex ecosystems were by Firmicutes . Further analysis showed that the simple ecosystems tend to possess higher resistance and lower resilience while the complex ecosystems displayed the opposite trend. Resistance and resilience were significantly negatively correlated. Structural equation modeling showed that richness provided a higher contribution to bacterial and fungal resistance than to resilience while nutrients provided a higher contribution to resilience than to resistance. This research explored the influence of extreme high temperature stress on soil microbial community and the resistance and resilience of microbial community different types ecosystems to the stress, highlighted the respectively greater relative contribution of richness and nutrients offered to resistance and resilience, which provided valuable information for future prediction on microbial community response to climatic stresses.