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Impacts of Soil Faunal Community Composition on Model Grassland Ecosystems.

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  • M. A. Bradford
  • T. H. Jones
  • Richard D. Bardgett
  • Helaina I. J. Black
  • B. Boag
  • M. Bonkowski
  • R. Cook
  • T. Eggers
  • A. C. Gange
  • S. J. Grayston
  • E. Kandeler
  • A. E. McCaig
  • J. E. Newington
  • J. I. Prosser
  • H. Setälä
  • P. L. Staddon
  • G. M. Tordoff
  • D. Tscherko
  • J. H. Lawton
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<mark>Journal publication date</mark>18/10/2002
<mark>Journal</mark>Science
Issue number5593
Volume298
Number of pages4
Pages (from-to)615-618
Publication StatusPublished
<mark>Original language</mark>English

Abstract

Human impacts, including global change, may alter the composition of soil faunal communities, but consequences for ecosystem functioning are poorly understood. We constructed model grassland systems in the Ecotron controlled environment facility and manipulated soil community composition through assemblages of different animal body sizes. Plant community composition, microbial and root biomass, decomposition rate, and mycorrhizal colonization were all markedly affected. However, two key ecosystem processes, aboveground net primary productivity and net ecosystem productivity, were surprisingly resistant to these changes. We hypothesize that positive and negative faunal-mediated effects in soil communities cancel each other out, causing no net ecosystem effects.