Decomposition of urban atmospheric carbon in Sonoran Desert soils

Jason P. Kaye, Sara E. Eckert, Daniel A. Gonzales, Jonathan O. Allen, Sharon Hall, Ryan A. Sponseller, Nancy Grimm

Research output: Contribution to journalArticle

6 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)737-754
Number of pages18
JournalUrban Ecosystems
Volume14
Issue number4
DOIs
StatePublished - 2011

Fingerprint

desert soil
laboratory experiment
desert
decomposition
particulate matter
particulate organic carbon
carbon
organic carbon
soil
urban ecosystem
urban atmosphere
background level
aerodynamics
respiration
shrub
incubation
rate
canopy
mineralization
substrate

Keywords

  • Carbon deposition
  • Particulate matter
  • Soil respiration
  • Sonoran Desert
  • Urban

ASJC Scopus subject areas

  • Ecology
  • Urban Studies

Cite this

Kaye, J. P., Eckert, S. E., Gonzales, D. A., Allen, J. O., Hall, S., Sponseller, R. A., & Grimm, N. (2011). Decomposition of urban atmospheric carbon in Sonoran Desert soils. Urban Ecosystems, 14(4), 737-754. https://doi.org/10.1007/s11252-011-0173-8

Decomposition of urban atmospheric carbon in Sonoran Desert soils. / Kaye, Jason P.; Eckert, Sara E.; Gonzales, Daniel A.; Allen, Jonathan O.; Hall, Sharon; Sponseller, Ryan A.; Grimm, Nancy.

In: Urban Ecosystems, Vol. 14, No. 4, 2011, p. 737-754.

Research output: Contribution to journalArticle

Kaye, JP, Eckert, SE, Gonzales, DA, Allen, JO, Hall, S, Sponseller, RA & Grimm, N 2011, 'Decomposition of urban atmospheric carbon in Sonoran Desert soils', Urban Ecosystems, vol. 14, no. 4, pp. 737-754. https://doi.org/10.1007/s11252-011-0173-8
Kaye JP, Eckert SE, Gonzales DA, Allen JO, Hall S, Sponseller RA et al. Decomposition of urban atmospheric carbon in Sonoran Desert soils. Urban Ecosystems. 2011;14(4):737-754. https://doi.org/10.1007/s11252-011-0173-8
Kaye, Jason P. ; Eckert, Sara E. ; Gonzales, Daniel A. ; Allen, Jonathan O. ; Hall, Sharon ; Sponseller, Ryan A. ; Grimm, Nancy. / Decomposition of urban atmospheric carbon in Sonoran Desert soils. In: Urban Ecosystems. 2011 ; Vol. 14, No. 4. pp. 737-754.
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