Responses of soil rare and abundant microorganisms to recurring biotic disturbances. (February 2023)

• Record Type: Journal Article
• Authors: Wang, Zhikang; Leite, Marcio F.A.; Jiang, Mingkai; Kuramae, Eiko E.; Fu, Xiangxiang
• Is Part Of: Soil biology and biochemistry. Volume 177(2023)
• Publication Date: 2023-02
• Subjects: Rare taxa -- Abundant taxa -- Biotic disturbance -- Temporal change -- Inoculation -- Soil microbiome; PSB phosphate-solubilizing bacteria -- NFB nitrogen-fixing bacteria -- RT rare taxa -- CRT conditionally rare taxa -- AT abundant taxa -- CAT conditionally abundant taxa -- MT moderate taxa -- CRAT conditionally rare or abundant taxa -- OT other taxa except RT and CRT; Soil biochemistry -- Periodicals; Soil biology -- Periodicals; Sols -- Biochimie -- Périodiques; Sols -- Biologie -- Périodiques; Sols -- Microbiologie -- Périodiques; Bodembiologie; Biochemie; 631.46
• DOI: 10.1016/j.soilbio.2022.108913
• Languages: English
• ISSNs: 0038-0717

Abstract

Abstract: Periodic inoculations of soil-beneficial microbes can increase their populations, but they also act as recurring biotic disturbances on the native microbial community. Soil rare and abundant microorganisms disproportionally shape the community diversity and stability. Uncovering their dynamic responses to recurring biotic disturbances and the underlying driving factors helps improve our understanding of the inoculation effects. Here, we imposed temporally recurring biotic disturbances by inoculating soils with phosphate-solubilizing bacteria, nitrogen-fixing bacteria, and the combination of both, with the overall aim of studying the successive responses of bacterial and fungal subcommunities along a rarity index. Our results showed that, in both bacterial and fungal communities, the relatively rare taxa exhibited higher diversity than the abundant taxa, and the relative abundance of rare taxa increased with recurring disturbances. However, the responses of rare and abundant taxa to inoculations were different between bacteria and fungi and were related to time and inoculation frequency. The rarer bacteria and the more abundant fungi explained most of the effects of inoculations on the resident microbial community. About 20 percent of the microbes changed their rarity categories over time, and most of the changes and interactions occurred within the rarer taxa during the first 45 days. Modeling analyses and co-occurrence networks indicated that microbial interactions, soil biochemical factors, and inoculation time drove the shifts of subcommunities. In summary, relatively rare bacteria and relatively abundant fungi play major roles in understanding the impacts of recurring biotic disturbances, while the conditionality of microbial rarity is dependent on both biotic and abiotic factors. Graphical abstract: Image 1 Highlights: Periodic microbial inoculations were conducted as recurring biotic disturbances. Successions of soil rare and abundant microbial subcommunities were investigated. Effects of disturbances were time-dependent and varied in different subcommunities. Relatively rare bacteria and abundant fungi explained the most inoculation effects. Microbial interactions and soil factors drove the shifts of subcommunities.