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JenaTron - An Experimental Approach to Study the Effects of Plant History and Soil History on Grassland Ecosystem Functioning
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Functional diversity increases ecological stability in a grazed grassland.

Lauren M Hallett1,2,3, Claudia Stein4,5, Katharine N Suding4,6

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Moderate grazing legacies enhance ecological stability in grasslands by maintaining functional diversity, crucial for ecosystem resilience against variable rainfall and drought.

Keywords:
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Area of Science:

  • Ecology
  • Ecosystem Science
  • Conservation Biology

Background:

  • Ecological stability in fluctuating environments is key.
  • Functional diversity can stabilize ecosystems if species compensate for environmental changes.
  • Evidence for this diversity-stability relationship is inconsistent.

Purpose of the Study:

  • To test if diverse functional responses to rainfall enhance vegetation stability.
  • To investigate the role of land-use legacies (grazing) in maintaining functional diversity.
  • To understand how grazing history and rainfall interact to affect ecosystem function.

Main Methods:

  • Experimental grazing manipulation (low vs. moderate) in a California grassland.
  • Rainfall manipulation (irrigation and shelters) over three years.
  • Assessment of vegetation cover, biomass, and functional diversity (seed bank and aboveground).

Main Results:

  • Moderate grazing legacies significantly increased vegetation cover stability and slightly increased biomass stability.
  • Areas with moderate grazing histories initially had higher functional diversity.
  • Wet conditions reduced functional diversity; dry conditions maintained it without increasing it.

Conclusions:

  • Land-use legacies, specifically moderate grazing, are critical for maintaining functional diversity and ecosystem stability.
  • Practices reducing functional diversity can have lasting negative impacts on ecosystem responses to drought.
  • The diversity-stability theory is applicable to managed grazing landscapes.