Urban Ecosystems

, Volume 14, Issue 4, pp 737–754 | Cite as

Decomposition of urban atmospheric carbon in Sonoran Desert soils

  • Jason P. Kaye
  • Sara E. Eckert
  • Daniel A. Gonzales
  • Jonathan O. Allen
  • Sharon J. Hall
  • Ryan A. Sponseller
  • Nancy B. Grimm
Article

Abstract

Urban atmospheres can have high concentrations of particulate organic carbon (oC) but the rate and fate oC deposition in near-urban ecosystems are rarely quantified. We collected atmospheric particulate matter in Phoenix, AZ and applied these samples to Sonoran Desert soils in a series of laboratory incubation experiments. The addition of fine particulate matter (<2.5 μm aerodynamic diameter) increased microbial respiration in soils collected from the interspaces between desert shrubs. The increase in soil respiration was equivalent to 25% to 30% of the added oC. In contrast, we did not detect increases in respiration when coarse particulate matter (>2.5 μm aerodynamic diameter) was added to interspace soils, suggesting that coarse particulate oC is recalcitrant to microbial decomposition. Due to comparatively higher background levels of C mineralization, we rarely detected changes in microbial respiration when fine or coarse particulate oC was added to soils collected beneath shrub canopies. We measured total atmospheric C concentrations within and surrounding Phoenix and, using inferential methods, estimated rates of deposition that ranged from 0.02 to 0.58 mg C m−2 d−1 for fine particles and from 0 to 6.15 mg C m−2 d−1 for coarse particles. Results show that fine atmospheric particulate matter deposited at low rates downwind of Phoenix is a labile oC substrate for soil heterotrophs. In contrast, oC deposited at higher rates as coarse particulate matter may accumulate in soils due to slow microbial decomposition rates.

Keywords

Carbon deposition Particulate matter Sonoran Desert Soil respiration Urban 

Supplementary material

11252_2011_173_MOESM1_ESM.doc (78 kb)
ESM 1(DOC 78 kb)

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Jason P. Kaye
    • 1
  • Sara E. Eckert
    • 1
  • Daniel A. Gonzales
    • 2
  • Jonathan O. Allen
    • 2
    • 3
    • 4
  • Sharon J. Hall
    • 5
  • Ryan A. Sponseller
    • 5
    • 6
  • Nancy B. Grimm
    • 5
  1. 1.Department of Crop and Soil SciencesThe Pennsylvania State UniversityUniversity ParkUSA
  2. 2.Department of Chemical EngineeringArizona State UniversityTempeUSA
  3. 3.Department of Civil & Environmental EngineeringArizona State UniversityTempeUSA
  4. 4.Allen Analytics LLCTucsonUSA
  5. 5.School of Life SciencesArizona State UniversityTempeUSA
  6. 6.Department of Forest Ecology and ManagementSwedish University of Agricultural SciencesUmeå SE-901 83Sweden

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