Abstract
Aims
In deserts, moss-dominated crusts may play an important role in terrestrial-aquatic and aboveground-belowground connections. Despite its importance, very little is known about moss’s role in biogeochemical cycles and how nutrient pulses (e.g., from N deposition in air pollution) will affect their functional significance as an integrator of nutrient cycling in deserts.
Methods
Moss and soil were sampled from 15 sites in the Sonoran Desert in and around Phoenix, covering the city core subject to N deposition and rural areas to the east and west. Samples were analyzed for C, N, P and micronutrient content to compare moss stoichiometry over a gradient of soil resource availability.
Results
Moss %N and %P were positively correlated with soil N and P. Thus, sites in the city core subject to N deposition tended to have higher soil N and therefore higher moss N than the sites outside the city core. Micronutrient content varied with sampling region but was not related to soil content.
Conclusions
Results suggest that moss can take up excess N,, but overall coverage of moss is lower in the city, limiting its ability to act as a N sink.
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Acknowledgments
This research was supported by National Science Foundation Division of Environmental Biology grants to the CAP-LTER (CAP3: BCS-1026865), including the CAP-LTER REU program, as well as by the New College of Interdisciplinary Arts & Sciences at Arizona State University. We thank students Jen Bagby, Melanie Kepler, Chelsey Tellez, Jack Ramsey, and Amber Deines for their help in the field and lab. Cathy Kochert, Roy Erickson, and Sara Ryan at the Goldwater Environmental Lab at ASU provided analytical services. Quincy Stewart and Stevan Earl provided logistical support. We thank Sharon Hall for her input on an earlier version of this manuscript.
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Ball, B.A., Alvarez Guevara, J. The nutrient plasticity of moss-dominated crust in the urbanized Sonoran Desert. Plant Soil 389, 225–235 (2015). https://doi.org/10.1007/s11104-014-2355-7
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DOI: https://doi.org/10.1007/s11104-014-2355-7