Climate – grazing interactions in Mongolian rangelands: Effects of grazing change along a large-scale environmental gradient

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Julian Ahlborn - , Leibniz Centre for Agricultural Landscape Research, Leuphana University of Lüneburg, Senckenberg Gesellschaft für Naturforschung (Author)
  • Henrik von Wehrden - , Leuphana University of Lüneburg (Author)
  • Birgit Lang - , Friedrich Schiller University Jena (Author)
  • Christine Römermann - , Friedrich Schiller University Jena, German Centre for Integrative Biodiversity Research (iDiv) Halle—Jena—Leipzig (Author)
  • Munkhzul Oyunbileg - , Mongolian Academy of Science (Author)
  • Batlai Oyuntsetseg - , National University of Mongolia (Author)
  • Karsten Wesche - , International Institute Zittau, Chair of Biodiversity of Higher Plants, Senckenberg Gesellschaft für Naturforschung, German Centre for Integrative Biodiversity Research (iDiv) Halle—Jena—Leipzig (Author)

Abstract

There are still major gaps in our understanding of rangeland degradation. Assessing the interactions between climate and grazing effects could help to explain what unifies and separates rangelands, and may therefore promote a more sustainable management of livestock. We studied 15 local land-use transects along a 600 km long climatic gradient in Central Asia to test the hypothesis that grazing effects differ between relatively moist equilibrium (EQ) and dry non-equilibrium (NEQ) rangeland systems. We analysed plant community composition, species diversity and indicator species for different grazing intensities. We found pronounced differences in community composition along our climate gradient, revealed climate-related grazing effects on richness, responses of Simpson's diversity, and also found different grazing indicator species along the larger transect. We conclude that in NEQ rangelands, grazing effects are limited to sacrifice zones and environmental filtering dominates vegetation composition. With increasing precipitation, resource availability gains in importance leading to more complex communities dominated by grazing-tolerant species under EQ dynamics. Hints for xerophytization in the transition zone between EQ and NEQ highlight the vulnerability of rangelands that temporally shift from one state to the other. This calls for extra care in the management of livestock numbers in these transition areas.

Details

Original languageEnglish
Article number104043
JournalJournal of arid environments
Volume173
Publication statusPublished - Feb 2020
Peer-reviewedYes

Keywords

Keywords

  • DCA, Gradients, Grazing, Indicator species analysis, Non-equilibrium rangelands, Species diversity, Xerophytization