Abstract
Terrestrial desert ecosystems are strongly structured by the distribution of plants, which concentrate resources and create islands of fertility relative to interplant spaces. Atmospheric nitrogen (N) deposition resulting from urbanization has the potential to change those spatial patterns via resource inputs, resulting in more homogeneous soil resource availability. We sampled soils at 12 desert remnant sites around Phoenix, Arizona along a model-predicted gradient in N deposition to determine the degree to which deposition has altered spatial patterns in soil resource availability and microbial activity. Soil microbial biomass and abundance were not influenced by atmospheric N deposition. Instead, plant islands remained strong organizers of soil microbial processes. These islands of fertility exhibited elevated pools of resources, microbial abundance, and activity relative to interspaces. In both plant islands and interspaces, soil moisture and soil N concentrations predicted microbial biomass and abundance. Following experimental wetting, carbon dioxide (CO2) flux from soil of interspaces was positively correlated with N deposition, whereas in plant islands, soil CO2 flux was positively correlated with soil moisture content and soil organic matter. Soil CO2 flux in both patch types showed rapid and short-lived responses to precipitation, demonstrating the brief time scales during which soil biota may process deposited materials. Although we observed patterns consistent with N limitation of microbes in interspaces, we conclude that atmospheric N deposition likely accumulates in soils because microbes are primarily limited by water and secondarily by carbon or nitrogen. Soil microbial uptake of atmospherically deposited N likely occurs only during sparse and infrequent rainfall.
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Acknowledgements
Support for this research was provided in part by grants from the Arizona State University Office of the Provost through the School of Life Sciences Enrichment Program and by NSF grants DEB-0423704 and DEB-0514382. We thank Rebecca Martin, Craig McCrackin, and Nicole Styles for assistance in the field and Shannon Johnson for expertise with microbial abundance methods. Ryan Sponseller and two anonymous reviewers provided valuable comments on previous versions of this manuscript.
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McCrackin, M.L., Harms, T.K., Grimm, N.B. et al. Responses of soil microorganisms to resource availability in urban, desert soils. Biogeochemistry 87, 143–155 (2008). https://doi.org/10.1007/s10533-007-9173-4
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DOI: https://doi.org/10.1007/s10533-007-9173-4