Soil bacterial diversity is positively correlated with decomposition rates during early phases of maize litter decomposition

Akane Chiba, Yoshitaka Uchida, Susanne Kublik, Gisle Vestergaard, Franz Buegger, Michael Schloter, Stefanie Schulz*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

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Abstract

This study aimed to investigate the effects of different levels of soil‐ and plant‐associated bacterial diversity on the rates of litter decomposition, and bacterial community dynamics during its early phases. We performed an incubation experiment where soil bacterial diversity (but not abundance) was manipulated by autoclaving and reinoculation. Natural or autoclaved maize leaves were applied to the soils and incubated for 6 weeks. Bacterial diversity was assessed before and during litter decomposition using 16S rRNA gene metabarcoding. We found a positive correlation between litter decomposition rates and soil bacterial diversity. The soil with the highest bacterial diversity was dominated by oligotrophic bacteria including Acidobacteria, Nitrospiraceae, and Gai-ellaceae, and its community composition did not change during the incubation. In the less diverse soils, those taxa were absent but were replaced by copiotrophic bacteria, such as Caulobacteraceae and Beijerinckiaceae, until the end of the incubation period. SourceTracker analysis revealed that lit-ter‐associated bacteria, such as Beijerinckiaceae, only became part of the bacterial communities in the less diverse soils. This suggests a pivotal role of oligotrophic bacteria during the early phases of litter decomposition and the predominance of copiotrophic bacteria at low diversity.

Original languageEnglish
Article number357
JournalMicroorganisms
Volume9
Issue number2
Number of pages20
ISSN2076-2607
DOIs
Publication statusPublished - 2021

Bibliographical note

Funding Information:
Funding: This study was supported by the Japan Society for the Promotion of Science (JSPS) KA‐ KENHI (No. 26520301) and the German Federal Ministry of Education and Research (BMBF) projects InnoSoilPhos (No. 031B0509B) and Soil3 (No. 031B0515B)—in the frame of the BonaRes Program. Akane Chiba was supported by the Japan Student Services Organization (JASSO) to study abroad at Technical University of Munich.

Keywords

  • Actinobacteria
  • Caulobacteraceae
  • Maize litter decomposition
  • Soil bacterial diversity

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