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Biocrusts benefit from plant removal.

Eva Dettweiler-Robinson1, Robert L Sinsabaugh1, Jennifer A Rudgers1

  • 1Department of Biology, University of New Mexico, MSC 03 2020, 1 University of New Mexico, Albuquerque, NM, 87131-0001.

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Dryland plant and biocrust interactions are sensitive to precipitation. Belowground networks enhance biocrust productivity, highlighting their crucial role in ecosystem resilience.

Keywords:
Bouteloua gracilisbelowground connectionsbiocrustcompetitioncyanobacteriafungiplant-microbe interactionsprecipitation regimeproducer removal

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Area of Science:

  • Dryland ecology
  • Ecosystem interactions
  • Biocrust research

Background:

  • Dryland productivity relies on plant-biocrust interactions.
  • Climate variability impacts these interactions.
  • Belowground biota roles are understudied.

Purpose of the Study:

  • Evaluate plant and biocrust interactions under varying precipitation.
  • Investigate the influence of belowground biota on dryland productivity.
  • Understand context-dependency of these relationships.

Main Methods:

  • Field mesocosms with grass (Bouteloua gracilis) and biocrusts.
  • Simulated producer loss via clipping or sterilization.
  • Manipulated precipitation regimes (large, infrequent vs. small, frequent).
  • Assessed belowground connectivity using mesh barriers.

Main Results:

  • Biocrusts enhanced chlorophyll under small, frequent rain when plants were absent.
  • Plant growth declined with biocrust removal; negative correlation observed in year two.
  • Belowground connectivity weakly boosted biocrust productivity but slightly hindered plant productivity.

Conclusions:

  • Altered precipitation can amplify positive plant removal effects on biocrusts.
  • Belowground networks are vital for dryland productivity by supporting biocrusts.