Soil microbial responses to nitrogen addition in arid ecosystems
Abstract
The N cycle of arid ecosystems is influenced by low soil organic matter, high soil pH, and extremes in water potential and temperature that lead to open canopies and development of biological soil crusts (biocrusts). We investigated the effects of N amendment on soil microbial dynamics in a Larrea tridentata-Ambrosia dumosa shrubland site in southern Nevada USA. Sites were fertilized with a NO3-NH4 mix at 0, 7, and 15 kg N ha-1 y-1 from March 2012 to March 2013. In March 2013, biocrust (0–0.5 cm) and bulk soils (0–10 cm) were collected beneath Ambrosia canopies and in the interspaces between plants. Biomass responses were assessed as bacterial and fungal SSU rRNA gene copy number and chlorophyll a concentration. Metabolic responses were measured by five ecoenzyme activities and rates of N transformation. By most measures, nutrient availability, microbial biomass, and process rates were greater in soils beneath the shrub canopy compared to the interspace between plants, and greater in the surface biocrust horizon compared to the deeper 10 cm soil profile. Most measures responded positively to experimental N addition. Effect sizes were generally greater for bulk soil than biocrust. Results were incorporated into a meta-analysis of arid ecosystem responses to Nmore »
- Authors:
-
- Univ. of New Mexico, Albuquerque, NM (United States)
- U.S. Geological Survey, Moab, UT (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- California State Univ., Fullerton, CA (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1222587
- Alternate Identifier(s):
- OSTI ID: 1234906
- Report Number(s):
- LA-UR-15-20751
Journal ID: ISSN 1664-302X
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Frontiers in Microbiology
- Additional Journal Information:
- Journal Volume: 6; Journal ID: ISSN 1664-302X
- Publisher:
- Frontiers Research Foundation
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; arid ecosystems; nitrogen deposition; microbial biomass; ecoenzyme activity; meta-analysis; 59 BASIC BIOLOGICAL SCIENCES
Citation Formats
Sinsabaugh, Robert L., Belnap, Jayne, Rudgers, Jennifer, Kuske, Cheryl R., Martinez, Noelle, and Sandquist, Darren. Soil microbial responses to nitrogen addition in arid ecosystems. United States: N. p., 2015.
Web. doi:10.3389/fmicb.2015.00819.
Sinsabaugh, Robert L., Belnap, Jayne, Rudgers, Jennifer, Kuske, Cheryl R., Martinez, Noelle, & Sandquist, Darren. Soil microbial responses to nitrogen addition in arid ecosystems. United States. https://doi.org/10.3389/fmicb.2015.00819
Sinsabaugh, Robert L., Belnap, Jayne, Rudgers, Jennifer, Kuske, Cheryl R., Martinez, Noelle, and Sandquist, Darren. Fri .
"Soil microbial responses to nitrogen addition in arid ecosystems". United States. https://doi.org/10.3389/fmicb.2015.00819. https://www.osti.gov/servlets/purl/1222587.
@article{osti_1222587,
title = {Soil microbial responses to nitrogen addition in arid ecosystems},
author = {Sinsabaugh, Robert L. and Belnap, Jayne and Rudgers, Jennifer and Kuske, Cheryl R. and Martinez, Noelle and Sandquist, Darren},
abstractNote = {The N cycle of arid ecosystems is influenced by low soil organic matter, high soil pH, and extremes in water potential and temperature that lead to open canopies and development of biological soil crusts (biocrusts). We investigated the effects of N amendment on soil microbial dynamics in a Larrea tridentata-Ambrosia dumosa shrubland site in southern Nevada USA. Sites were fertilized with a NO3-NH4 mix at 0, 7, and 15 kg N ha-1 y-1 from March 2012 to March 2013. In March 2013, biocrust (0–0.5 cm) and bulk soils (0–10 cm) were collected beneath Ambrosia canopies and in the interspaces between plants. Biomass responses were assessed as bacterial and fungal SSU rRNA gene copy number and chlorophyll a concentration. Metabolic responses were measured by five ecoenzyme activities and rates of N transformation. By most measures, nutrient availability, microbial biomass, and process rates were greater in soils beneath the shrub canopy compared to the interspace between plants, and greater in the surface biocrust horizon compared to the deeper 10 cm soil profile. Most measures responded positively to experimental N addition. Effect sizes were generally greater for bulk soil than biocrust. Results were incorporated into a meta-analysis of arid ecosystem responses to N amendment that included data from 14 other studies. Effect sizes were calculated for biomass and metabolic responses. Regressions of effect sizes, calculated for biomass, and metabolic responses, showed similar trends in relation to N application rate and N load (rate × duration). The critical points separating positive from negative treatment effects were 88 kg ha-1 y-1 and 159 kg ha-1, respectively, for biomass, and 70 kg ha-1 y-1 and 114 kg ha-1, respectively, for metabolism. These critical values are comparable to those for microbial biomass, decomposition rates and respiration reported in broader meta-analyses of N amendment effects in mesic ecosystems. As a result, large effect sizes at low N addition rates indicate that arid ecosystems are sensitive to modest increments in anthropogenic N deposition.},
doi = {10.3389/fmicb.2015.00819},
journal = {Frontiers in Microbiology},
number = ,
volume = 6,
place = {United States},
year = {Fri Aug 14 00:00:00 EDT 2015},
month = {Fri Aug 14 00:00:00 EDT 2015}
}
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journal, April 2014
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journal, May 2008
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- Journal of Ecology, Vol. 96, Issue 5
Nitrogen additions and microbial biomass: a meta-analysis of ecosystem studies
journal, October 2008
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Stoichiometry of soil enzyme activity at global scale: Stoichiometry of soil enzyme activity
journal, September 2008
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journal, May 2015
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- Science, Vol. 348, Issue 6237
Ecoenzymatic Stoichiometry and Ecological Theory
journal, December 2012
- Sinsabaugh, Robert L.; Follstad Shah, Jennifer J.
- Annual Review of Ecology, Evolution, and Systematics, Vol. 43, Issue 1
A Multiscale, Hierarchical Model of Pulse Dynamics in Arid-Land Ecosystems
journal, November 2014
- Collins, S. L.; Belnap, J.; Grimm, N. B.
- Annual Review of Ecology, Evolution, and Systematics, Vol. 45, Issue 1
Measuring Plant Interactions: a new Comparative Index
journal, October 2004
- Armas, Cristina; Ordiales, Ramón; Pugnaire, Francisco I.
- Ecology, Vol. 85, Issue 10
PROGRESSIVE NITROGEN LIMITATION OF ECOSYSTEM PROCESSES UNDER ELEVATED CO 2 IN A WARM-TEMPERATE FOREST
journal, January 2006
- Finzi, Adrien C.; Moore, David J. P.; DeLucia, Evan H.
- Ecology, Vol. 87, Issue 1
Nitrogen Additions and Litter Decomposition: a Meta-Analysis
journal, December 2005
- Knorr, M.; Frey, S. D.; Curtis, P. S.
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journal, December 2011
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journal, January 2012
- Biudes, Marcelo S.; Vourlitis, George L.
- Soil Science Society of America Journal, Vol. 76, Issue 6
Impact of Topography, Annual Burning, and Nitrogen Addition on Soil Microbial Communities in a Semiarid Grassland
journal, January 2013
- Zhang, Naili; Xu, Wenhua; Yu, Xingjun
- Soil Science Society of America Journal, Vol. 77, Issue 4
Diversity and distribution of soil fungal communities in a semiarid grassland
journal, January 2011
- Porras-Alfaro, Andrea; Herrera, Jose; Natvig, Donald O.
- Mycologia, Vol. 103, Issue 1
Works referencing / citing this record:
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