Plant and Soil

, Volume 212, Issue 1, pp 23–33

The influence of nematodes on below-ground processes in grassland ecosystems

Authors

  • Richard D. Bardgett
    • School of Biological SciencesUniversity of Manchester
  • Roger Cook
    • Institute of Grassland and Environmental ResearchPlas Gogerddan, Aberystwyth
  • Gregor W. Yeates
    • Landcare Research
  • Crystal S. Denton
    • School of Biological SciencesUniversity of Manchester
    • Institute of Grassland and Environmental ResearchPlas Gogerddan, Aberystwyth
Article

DOI: 10.1023/A:1004642218792

Cite this article as:
Bardgett, R.D., Cook, R., Yeates, G.W. et al. Plant and Soil (1999) 212: 23. doi:10.1023/A:1004642218792

Abstract

This review summarises recent information on beneficial roles that soil nematodes play in the cycling of carbon and other plant nutrients in grassland ecosystems. In particular, we focus on the role of the two dominant functional groups of nematodes, namely the microbial- and root-feeders, and how their activities may enhance soil ecosystem-level processes of nutrient cycling and, ultimately, plant productivity in managed and unmanaged grassland ecosystems. We report recent experiments which show that low amounts of root herbivory by nematodes can increase the allocation of photoassimilate carbon to roots, leading to increased root exudation and microbial activity in the rhizosphere. The effects of these interactions on soil nutrient cycling and plant productivity are discussed. Evidence is presented to show that the feeding activities of microbial-feeding nematodes can enhance nutrient mineralization and plant nutrient uptake in grasslands, but that these responses are highly species-specific and appear to be strongly regulated by higher trophic groups of fauna (top-down regulation). We recommend that future studies of the roles of nematodes in grasslands ecosystems should consider these more complex trophic interactions and also the effects of species diversity of nematodes on soil ecosystem-level processes.

ecosystemgrasslandsmicroorganismsmineralizationnematodesrootssoil

Copyright information

© Kluwer Academic Publishers 1999