Ecosystems

, Volume 17, Issue 5, pp 931–945 | Cite as

A Synthesis of Climate and Vegetation Cover Effects on Biogeochemical Cycling in Shrub-Dominated Drylands

  • Marie-Anne de Graaff
  • Heather L. Throop
  • Paul S. J. Verburg
  • John A. ArnoneIII
  • Xochi Campos
Article

Abstract

Semi-arid and arid ecosystems dominated by shrubs (“dry shrublands”) are an important component of the global C cycle, but impacts of climate change and elevated atmospheric CO2 on biogeochemical cycling in these ecosystems have not been synthetically assessed. This study synthesizes data from manipulative studies and from studies contrasting ecosystem processes in different vegetation microsites (that is, shrub or herbaceous canopy versus intercanopy microsites), to assess how changes in climate and atmospheric CO2 affect biogeochemical cycles by altering plant and microbial physiology and ecosystem structure. Further, we explore how ecosystem structure impacts on biogeochemical cycles differ across a climate gradient. We found that: (1) our ability to project ecological responses to changes in climate and atmospheric CO2 is limited by a dearth of manipulative studies, and by a lack of measurements in those studies that can explain biogeochemical changes, (2) changes in ecosystem structure will impact biogeochemical cycling, with decreasing pools and fluxes of C and N if vegetation canopy microsites were to decline, and (3) differences in biogeochemical cycling between microsites are predictable with a simple aridity index (MAP/MAT), where the relative difference in pools and fluxes of C and N between vegetation canopy and intercanopy microsites is positively correlated with aridity. We conclude that if climate change alters ecosystem structure, it will strongly impact biogeochemical cycles, with increasing aridity leading to greater heterogeneity in biogeochemical cycling among microsites. Additional long-term manipulative experiments situated across dry shrublands are required to better predict climate change impacts on biogeochemical cycling in deserts.

Keywords

climate change elevated atmospheric CO2 semi-arid and arid ecosystems biogeochemical cycles meta analysis spatial heterogeneity 

Notes

Acknowledgments

We thank Brenda Nieto, Amanda Sills, and Richard Jasoni for assisting with data collection. This work was supported by the National Science Foundation EPSCoR Program (EPS-0814387) with additional support from NSF DEB 0953864.

Supplementary material

10021_2014_9764_MOESM1_ESM.docx (19 kb)
Supplementary material 1 (DOCX 19 kb)

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Marie-Anne de Graaff
    • 1
  • Heather L. Throop
    • 2
  • Paul S. J. Verburg
    • 3
  • John A. ArnoneIII
    • 4
  • Xochi Campos
    • 1
  1. 1.Department of Biological SciencesBoise State UniversityBoiseUSA
  2. 2.Department of BiologyNew Mexico State UniversityLas CrucesUSA
  3. 3.Department of Natural Resources and Environmental ScienceUniversity of NevadaRenoUSA
  4. 4.Division of Earth and Ecosystem SciencesDesert Research InstituteRenoUSA

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