Emergent properties of microbial communities drive accelerated biogeochemical cycling in disturbed temperate forests

Ernest D. Osburn, Brian D. Badgley, Brian D. Strahm, Frank O. Aylward, J. E. Barrett

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Despite ever-increasing availability of detailed information about microbial community structure, relationships of microbial diversity with ecosystem functioning remain unclear. We investigated these relationships at the Coweeta Hydrologic Laboratory, where past forest disturbances (e.g., clear-cut) have altered both ecosystem processes (e.g., increased N export) and microbial communities (e.g., increased bacterial diversity). We sampled soils from disturbed and adjacent reference forests, characterized resident microbial communities, and measured several microbial C-cycle and N-cycle process rates. Microbial communities from historically disturbed soils exhibited altered ecosystem functioning, including generally higher rates of C- and N-cycle processes. Disturbed soil microbial communities also exhibited altered ecosystem multifunctionality, a composite variable consisting of all measured process rates as well as extracellular enzyme activities. Although we found few relationships between ecosystem functions and microbial alpha diversity, all functions were correlated with microbial community composition metrics, particularly r:K strategist ratios of bacterial phyla. Additionally, for both ecosystem multifunctionality and specific processes (i.e., C- and N-mineralization), microbial metrics significantly improved models seeking to explain variation in process rates. Our work sheds light on the links between microbial communities and ecosystem functioning and identifies specific microbial metrics important for modeling ecosystem responses to environmental change.

Original languageEnglish
Article numbere03553
JournalEcology
Volume102
Issue number12
DOIs
StatePublished - Dec 2021

Bibliographical note

Publisher Copyright:
© 2021 by the Ecological Society of America

Keywords

  • 16S
  • carbon mineralization
  • disturbance
  • extracellular enzymes
  • forest
  • ITS
  • microbial community
  • nitrification
  • nitrogen mineralization
  • soil

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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