Soil fungal: Bacterial ratios are linked to altered carbon cycling

Ashish A. Malik* (Corresponding Author), Somak Chowdhury, Veronika Schlager, Anna Oliver, Jeremy Puissant, Perla G.M. Vazquez, Nico Jehmlich, Martin von Bergen, Robert I. Griffiths, Gerd Gleixner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

215 Citations (Scopus)
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Despite several lines of observational evidence, there is a lack of consensus on whether higher fungal:bacterial (F:B) ratios directly cause higher soil carbon (C) storage. We employed RNA sequencing, protein profiling and isotope tracer techniques to evaluate whether differing F:B ratios are associated with differences in C storage. A mesocosm 13C labeled foliar litter decomposition experiment was performed in two soils that were similar in their physico-chemical properties but differed in microbial community structure, specifically their F:B ratio (determined by PLFA analyses, RNA sequencing and protein profiling; all three corroborating each other). Following litter addition, we observed a consistent increase in abundance of fungal phyla; and greater increases in the fungal dominated soil; implicating the role of fungi in litter decomposition. Litter derived 13C in respired CO2 was consistently lower, and residual 13C in bulk SOM was higher in high F:B soil demonstrating greater C storage potential in the F:B dominated soil. We conclude that in this soil system, the increased abundance of fungi in both soils and the altered C cycling patterns in the F:B dominated soils highlight the significant role of fungi in litter decomposition and indicate that F:B ratios are linked to higher C storage potential.

Original languageEnglish
Article number1247
Number of pages11
JournalFrontiers in Microbiology
Publication statusPublished - 9 Aug 2016


  • Bacteria
  • Fungi
  • Litter decomposition
  • Proteomics
  • RNA sequencing
  • Soil carbon
  • Stable isotopes


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