Global patterns in belowground communities

Noah Fierer, Michael S. Strickland, Daniel Liptzin, Mark A. Bradford, Cory C. Cleveland

Research output: Contribution to journalReview articlepeer-review

Abstract

Although belowground ecosystems have been studied extensively and soil biota play integral roles in biogeochemical processes, surprisingly we have a limited understanding of global patterns in belowground biomass and community structure. To address this critical gap, we conducted a meta-analysis of published data (> 1300 datapoints) to compare belowground plant, microbial and faunal biomass across seven of the major biomes on Earth. We also assembled data to assess biome-level patterns in belowground microbial community composition. Our analysis suggests that variation in microbial biomass is predictable across biomes, with microbial biomass carbon representing 0.6-1.1% of soil organic carbon (r2 = 0.91) and 1-20% of total plant biomass carbon (r2 = 0.42). Approximately 50% of total animal biomass can be found belowground and soil faunal biomass represents < 4% of microbial biomass across all biomes. The structure of belowground microbial communities is also predictable: bacterial community composition and fungal : bacterial gene ratios can be predicted reasonably well from soil pH and soil C : N ratios respectively. Together these results identify robust patterns in the structure of belowground microbial and faunal communities at broad scales which may be explained by universal mechanisms that regulate belowground biota across biomes.

Original languageEnglish
Pages (from-to)1238-1249
Number of pages12
JournalEcology Letters
Volume12
Issue number11
DOIs
StatePublished - Nov 2009

Keywords

  • 16S rRNA
  • Acari
  • Collembola
  • Nematodes
  • Soil bacteria
  • Soil faunal biomass
  • Soil food webs
  • Soil fungi
  • Soil microbial biomass

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