Abstract：
Microbial inoculation involves transplanting microorganisms from their natural habitat to new plants or soils to improve plant performance, and it is being increasingly used in agriculture and ecological restoration. However, microbial inoculants can invade and alter the composition of native microbial communities; thus, a comprehensive analysis is urgently needed to understand the overall impact of microbial inoculants on the biomass, diversity, structure and network complexity of native communities. Here we provide a meta-analysis of 335 studies revealing a positive effect of microbial inoculants on soil microbial biomass. This positive effect was weakened by environmental stress and enhanced by the use of fertilizers and native inoculants. Although microbial inoculants did not alter microbial diversity, they induced major changes in the structure and bacterial composition of soil microbial communities, reducing the complexity of bacterial networks and increasing network stability. Finally, higher initial levels of soil nutrients amplified the positive impact of microbial inoculants on fungal biomass, actinobacterial biomass, microbial biomass carbon and microbial biomass nitrogen. Together, our results highlight the positive effects of microbial inoculants on soil microbial biomass, emphasizing the benefits of native inoculants and the important regulatory roles of soil nutrient levels and environmental stress.
摘要：
微生物接种涉及将微生物从其自然栖息地移植到新植物或土壤，以改善植物性能，越来越多地用于农业和生态修复。然而,微生物接种剂可以侵入和改变本地微生物群落的组成；因此，迫切需要进行全面分析，以了解微生物接种剂对生物量的总体影响，多样性,土著社区的结构和网络复杂性。在这里，我们提供了335项研究的荟萃分析，揭示了微生物接种剂对土壤微生物生物量的积极影响。这种积极作用因环境压力而减弱，并因使用肥料和天然接种剂而增强。虽然微生物接种剂并没有改变微生物的多样性，它们引起了土壤微生物群落结构和细菌组成的重大变化，降低细菌网络的复杂性，提高网络稳定性。最后,较高的土壤养分初始水平放大了微生物接种剂对真菌生物量的积极影响，放线菌生物量，微生物生物量碳和微生物生物量氮。一起,我们的结果强调了微生物接种剂对土壤微生物生物量的积极影响，强调本地接种剂的好处以及土壤养分水平和环境胁迫的重要调节作用。
