Ecosystems

, Volume 16, Issue 7, pp 1192–1202

The Response of Soil CO2 Fluxes to Progressively Excluding Vertebrate and Invertebrate Herbivores Depends on Ecosystem Type

  • Anita C. Risch
  • Alan G. Haynes
  • Matt D. Busse
  • Flurin Filli
  • Martin Schütz
Article

DOI: 10.1007/s10021-013-9676-x

Cite this article as:
Risch, A.C., Haynes, A.G., Busse, M.D. et al. Ecosystems (2013) 16: 1192. doi:10.1007/s10021-013-9676-x

Abstract

Grasslands support large populations of herbivores and store up to 30% of the world’s soil carbon (C). Thus, herbivores likely play an important role in the global C cycle. However, most studies on how herbivory impacts the largest source of C released from grassland soils—soil carbon dioxide (CO2) emissions—only considered the role of large ungulates. This ignores all other vertebrate and invertebrate herbivores and their collective effects on ecosystem properties. We progressively excluded large, medium, and small vertebrates and invertebrates from two subalpine grasslands (productive, heavily grazed short-grass; less productive, lightly grazed tall-grass) using size-selective fences, assessed the impact on soil CO2 emissions and related biotic and abiotic variables. Exclusion resulted in significant changes in soil CO2 emissions in both vegetation types. Short-grass soil CO2 emissions progressively increased when large and medium mammals were excluded. However, no difference was detected among plots were all or no herbivores grazed. In contrast, tall-grass soil CO2 emissions were not affected by mammal exclusion, but excluding all herbivores lead to reduced emissions. Soil micro-climatic parameters best predicted the patterns of soil CO2 emissions in short-grass vegetation, whereas root biomass was the best predictor of CO2 release in tall-grass vegetation. Our results showed that diverse herbivore communities affect soil respiration differently than assumed from previous studies that only excluded large ungulates. Such information is important if we are to understand how changes in herbivore species composition—as could happen through altered management practices, extinction or invasion—impact grassland C storage and release.

Keywords

vertebrate herbivores invertebrate herbivores consumption soil temperature soil moisture root biomass soil microbial biomass C Q10 exclusion soil respiration 

Supplementary material

10021_2013_9676_MOESM1_ESM.docx (547 kb)
Supplementary material 1 (DOCX 546 kb)

Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Anita C. Risch
    • 1
  • Alan G. Haynes
    • 1
  • Matt D. Busse
    • 2
  • Flurin Filli
    • 3
  • Martin Schütz
    • 1
  1. 1.Community EcologySwiss Federal Institute for Forest, Snow and Landscape ResearchBirmensdorfSwitzerland
  2. 2.USDA Forest ServicePacific Southwest Research StationReddingUSA
  3. 3.Swiss National ParkChasté Planta-WildenbergZernezSwitzerland