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Title: Soil bacterial and fungal community responses to nitrogen addition across soil depth and microhabitat in an arid shrubland

Abstract

Arid shrublands are stressful environments, typified by alkaline soils low in organic matter, with biologically-limiting extremes in water availability, temperature, and UV radiation. The widely-spaced plants and interspace biological soil crusts in these regions provide soil nutrients in a localized fashion, creating a mosaic pattern of plant- or crust-associated microhabitats with distinct nutrient composition. With sporadic and limited rainfall, nutrients are primarily retained in the shallow surface soil, patterning biological activity. We examined soil bacterial and fungal community responses to simulated nitrogen (N) deposition in an arid Larrea tridentata-Ambrosia dumosa field experiment in southern Nevada, USA, using high-throughput sequencing of ribosomal RNA genes. To examine potential interactions among the N application, microhabitat and soil depth, we sampled soils associated with shrub canopies and interspace biological crusts at two soil depths (0–0.5 or 0–10 cm) across the N-amendment gradient (0, 7, and 15 kg ha–1 yr–1). We hypothesized that localized compositional differences in soil microbiota would constrain the impacts of N addition to a microhabitat distribution that would reflect highly localized geochemical conditions and microbial community composition. The richness and community composition of both bacterial and fungal communities differed significantly by microhabitat and with soil depth in each microhabitat. Only bacterialmore » communities exhibited significant responses to the N addition. Community composition correlated with microhabitat and depth differences in soil geochemical features. As a result, given the distinct roles of soil bacteria and fungi in major nutrient cycles, the resilience of fungi and sensitivity of bacteria to N amendments suggests that increased N input predicted for many arid ecosystems could shift nutrient cycling toward pathways driven primarily by fungal communities.« less

Authors:
 [1];  [2];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. United States Geological Survey, Moab, UT (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1222486
Alternate Identifier(s):
OSTI ID: 1234922
Report Number(s):
LA-UR-15-20578
Journal ID: ISSN 1664-302X
Grant/Contract Number:  
LANL SFA; JB field research access; 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:
60 APPLIED LIFE SCIENCES; 59 BASIC BIOLOGICAL SCIENCES; dryland; shrubland; soil fungal community; soil bacterial community; global change; biological soil crusts; microhabitat; ribosomal RNA; 54 ENVIRONMENTAL SCIENCES

Citation Formats

Mueller, Rebecca C., Belnap, Jayne, and Kuske, Cheryl R.. Soil bacterial and fungal community responses to nitrogen addition across soil depth and microhabitat in an arid shrubland. United States: N. p., 2015. Web. doi:10.3389/fmicb.2015.00891.
Mueller, Rebecca C., Belnap, Jayne, & Kuske, Cheryl R.. Soil bacterial and fungal community responses to nitrogen addition across soil depth and microhabitat in an arid shrubland. United States. https://doi.org/10.3389/fmicb.2015.00891
Mueller, Rebecca C., Belnap, Jayne, and Kuske, Cheryl R.. Fri . "Soil bacterial and fungal community responses to nitrogen addition across soil depth and microhabitat in an arid shrubland". United States. https://doi.org/10.3389/fmicb.2015.00891. https://www.osti.gov/servlets/purl/1222486.
@article{osti_1222486,
title = {Soil bacterial and fungal community responses to nitrogen addition across soil depth and microhabitat in an arid shrubland},
author = {Mueller, Rebecca C. and Belnap, Jayne and Kuske, Cheryl R.},
abstractNote = {Arid shrublands are stressful environments, typified by alkaline soils low in organic matter, with biologically-limiting extremes in water availability, temperature, and UV radiation. The widely-spaced plants and interspace biological soil crusts in these regions provide soil nutrients in a localized fashion, creating a mosaic pattern of plant- or crust-associated microhabitats with distinct nutrient composition. With sporadic and limited rainfall, nutrients are primarily retained in the shallow surface soil, patterning biological activity. We examined soil bacterial and fungal community responses to simulated nitrogen (N) deposition in an arid Larrea tridentata-Ambrosia dumosa field experiment in southern Nevada, USA, using high-throughput sequencing of ribosomal RNA genes. To examine potential interactions among the N application, microhabitat and soil depth, we sampled soils associated with shrub canopies and interspace biological crusts at two soil depths (0–0.5 or 0–10 cm) across the N-amendment gradient (0, 7, and 15 kg ha–1 yr–1). We hypothesized that localized compositional differences in soil microbiota would constrain the impacts of N addition to a microhabitat distribution that would reflect highly localized geochemical conditions and microbial community composition. The richness and community composition of both bacterial and fungal communities differed significantly by microhabitat and with soil depth in each microhabitat. Only bacterial communities exhibited significant responses to the N addition. Community composition correlated with microhabitat and depth differences in soil geochemical features. As a result, given the distinct roles of soil bacteria and fungi in major nutrient cycles, the resilience of fungi and sensitivity of bacteria to N amendments suggests that increased N input predicted for many arid ecosystems could shift nutrient cycling toward pathways driven primarily by fungal communities.},
doi = {10.3389/fmicb.2015.00891},
journal = {Frontiers in Microbiology},
number = ,
volume = 6,
place = {United States},
year = {2015},
month = {9}
}

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journal, May 2008


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journal, March 2008


Targeted and shotgun metagenomic approaches provide different descriptions of dryland soil microbial communities in a manipulated field study: Sequencing to describe dryland soil communities
journal, February 2012


Grassland Responses to Global Environmental Changes Suppressed by Elevated CO2
journal, December 2002


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journal, May 2008


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Incorporating 16S Gene Copy Number Information Improves Estimates of Microbial Diversity and Abundance
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Microbiome Profiling by Illumina Sequencing of Combinatorial Sequence-Tagged PCR Products
journal, October 2010


Niche-Partitioning of Edaphic Microbial Communities in the Namib Desert Gravel Plain Fairy Circles
journal, October 2014


Toward an Ecological Classification of soil Bacteria
journal, June 2007

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Community niche predicts the functioning of denitrifying bacterial assemblages
journal, December 2009

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The world at your feet: desert biological soil crusts
journal, May 2003


Evidence for Fungal Dominance of Denitrification and Codenitrification in a Grassland Soil
journal, January 2002

  • Laughlin, Ronald J.; Stevens, R. James
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Nitrogen addition, not initial phylogenetic diversity, increases litter decomposition by fungal communities
journal, February 2015

  • Amend, Anthony S.; Matulich, Kristin L.; Martiny, Jennifer B. H.
  • Frontiers in Microbiology, Vol. 6
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Soil microbial responses to nitrogen addition in arid ecosystems
journal, August 2015

  • Sinsabaugh, Robert L.; Belnap, Jayne; Rudgers, Jennifer
  • Frontiers in Microbiology, Vol. 6
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Patterns of diversity for fungal assemblages of biological soil crusts from the southwestern United States
journal, March 2012

  • Bates, Scott T.; Nash, Thomas H.; Garcia-Pichel, Ferran
  • Mycologia, Vol. 104, Issue 2
  • DOI: 10.3852/11-232

Assembling the Fungal Tree of Life: constructing the Structural and Biochemical Database
journal, November 2006


pplacer: linear time maximum-likelihood and Bayesian phylogenetic placement of sequences onto a fixed reference tree
preprint, January 2010


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