Oecologia

, Volume 158, Issue 3, pp 545–555 | Cite as

Form and function of grass ring patterns in arid grasslands: the role of abiotic controls

  • Sujith Ravi
  • Paolo D’Odorico
  • Lixin Wang
  • Scott Collins
Ecosystem Ecology - Original Paper

Abstract

Ring-shaped growth patterns commonly occur in resource-limited arid and semi-arid environments. The spatial distribution, geometry, and scale of vegetation growth patterns result from interactions between biotic and abiotic processes, and, in turn, affect the spatial patterns of soil moisture, sediment transport, and nutrient dynamics in aridland ecosystems. Even though grass ring patterns are observed worldwide, a comprehensive understanding of the biotic and abiotic processes that lead to the formation, growth and breakup of these rings is still lacking. Our studies on patterns of infiltration and soil properties of blue grama (Bouteloua gracilis) grass rings in the northern Chihuahuan desert indicate that ring patterns result from the interaction between clonal growth mechanisms and abiotic factors such as hydrological and aeolian processes. These processes result in a negative feedback between sediment deposition and vegetation growth inside the bunch grass, which leads to grass die back at the center of the grass clump. We summarize these interactions in a simple theoretical and conceptual model that integrates key biotic and abiotic processes in ring formation, growth and decline.

Keywords

Aeolian processes Arid ecosystems Ecohydrology Infiltration Soil moisture 

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Sujith Ravi
    • 1
    • 2
  • Paolo D’Odorico
    • 2
  • Lixin Wang
    • 3
  • Scott Collins
    • 4
  1. 1.B2 Earthscience and UA Biosphere 2University of ArizonaTucsonAZUSA
  2. 2.Department of Environmental SciencesUniversity of VirginiaCharlottesvilleUSA
  3. 3.Department of Civil and Environmental EngineeringPrinceton UniversityPrincetonUSA
  4. 4.Department of BiologyUniversity of New MexicoAlbuquerqueUSA

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