Plant and Soil

, Volume 401, Issue 1–2, pp 381–395 | Cite as

Biotic communities cannot mitigate the negative effects of grazing on multiple ecosystem functions and services in an arid shrubland

  • Jing Zhang
  • David J. Eldridge
  • Manuel Delgado-Baquerizo
Regular Article

Abstract

Aims

Dryland biotic communities (plants and biocrusts) are known to maintain multiple functions (multifunctionality) and services (multiservices) that decline with overgrazing by domestic livestock. Here, we evaluate the role of biotic communities in controlling the responses of multiple functions and services to grazing in an arid shrubland.

Methods

We compared nine ecosystem functions and services associated with carbon and nitrogen cycling, and water infiltration at grazed and ungrazed sites in eastern Australia. We hypothesized that overgrazing would reduce individual functions, but that effects on multifunctionality and multiservices would be tempered by shrubs, vascular plants and biocrusts.

Results

Grazing reduced biocrust cover, soil phosphatase, β-glucosidase and potential mineralization, but not plant richness, soil respiration, infiltration measures nor dissolved inorganic N. In our models, grazing had the largest and most negative effects on multifunctionality and multiservices. Structural equation modelling showed that grazing reduced biocrust cover. Unlike the univariate analyses, grazing reduced plant cover and suppressed any positive effect of these biotic communities on multifunctionality and multiservices.

Conclusions

Our results suggest that any positive buffering by plant richness, shrubs and plant cover on multifunctions or multiservices will not offset the negative effects of grazing. Strategies to improve functionality of arid shrublands should focus on the management of total grazing pressure.

Keywords

Grazing Biocrust Chenopod shrublands Soil function Ecosystem services Infiltration Respiration Carbon cycling 

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Jing Zhang
    • 1
    • 2
  • David J. Eldridge
    • 2
  • Manuel Delgado-Baquerizo
    • 3
  1. 1.Key Laboratory of Biogeography and Bioresources in Arid Land, Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqiPeople’s Republic of China
  2. 2.University of New South Wales Arid Zone Research Station, Fowlers Gap, via Broken Hill, NSW, 2880, Australia, c/- Centre for Ecosystem Studies, School of Biological, Earth and Environmental Sciences, University of New South WalesSydneyAustralia
  3. 3.Hawkesbury Institute for the EnvironmentUniversity of Western SydneyPenrithAustralia

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