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Title: Identifying qualitative effects of different grazing types on below-ground communities and function in a long-term field experiment: Impact of grazing type on below-ground ecology

Journal Article · · Environmental Microbiology
 [1];  [2];  [2];  [3];  [4];  [3];  [5];  [5];  [6];  [7];  [1]
  1. Univ. of Western Sydney, Penrith, NSW (Australia)
  2. Imperial College London, Ascot, Berkshire (United Kingdom)
  3. Univ. of Colorado, Boulder, CO (United States)
  4. The James Hutton Inst., Aberdeen (United Kingdom)
  5. Univ. of Copenhagen (Denmark)
  6. Univ. of Oklahoma, Norman, OK (United States)
  7. Univ. of Oklahoma, Norman, OK (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth Science Division; Tsinghua Univ., Beijing (China)

Herbivory is an important modulator of plant biodiversity and productivity in grasslands, but our understanding of herbivore-induced changes on below-ground processes and communities is limited. Using a long-term (17 years) experimental site, we evaluated impacts of rabbit and invertebrate grazers on some soil functions involved in carbon cycling, microbial diversity, structure and functional composition. Both rabbit and invertebrate grazing impacted soil functions and microbial community structure. All functional community measures (functions, biogeochemical cycling genes, network association between different taxa) were more strongly affected by invertebrate grazers than rabbits. Furthermore, our results suggest that exclusion of invertebrate grazers decreases both microbial biomass and abundance of genes associated with key biogeochemical cycles, and could thus have long-term consequences for ecosystem functions. The mechanism behind these impacts are likely to be driven by both direct effects of grazing altering the pattern of nutrient inputs and by indirect effects through changes in plant species composition. However, we could not entirely discount that the pesticide used to exclude invertebrates may have affected some microbial community measures. Finally, our work illustrates that human activity that affects grazing intensity may affect ecosystem functioning and sustainability, as regulated by multi-trophic interactions between above- and below-ground communities.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1579709
Journal Information:
Environmental Microbiology, Vol. 17, Issue 3; ISSN 1462-2912
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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Cited By (5)

Asymmetric response of different functional insect groups to low-grazing pressure in Eurasian steppe in Ningxia journal November 2018
Competition drives the response of soil microbial diversity to increased grazing by vertebrate herbivores journal June 2017
Long-term effects of grassland management on soil microbial abundance: implications for soil carbon and nitrogen storage journal October 2018
Grazing-induced microbiome alterations drive soil organic carbon turnover and productivity in meadow steppe journal September 2018
How Fencing Affects the Soil Quality and Plant Biomass in the Grassland of the Loess Plateau journal September 2017