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

Mueller, Rebecca C.; Belnap, Jayne; Kuske, Cheryl R.

doi:10.3389/fmicb.2015.00891

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

Journal Article · Fri Sep 04 00:00:00 EDT 2015 · Frontiers in Microbiology

DOI:https://doi.org/10.3389/fmicb.2015.00891· OSTI ID:1222486

Mueller, Rebecca C. ^[1]; Belnap, Jayne ^[2]; Kuske, Cheryl R. ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
United States Geological Survey, Moab, UT (United States)

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.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: LANL SFA; JB field research access; AC52-06NA25396

OSTI ID:: 1222486

Alternate ID(s):: OSTI ID: 1234922

Report Number(s):: LA-UR-15-20578

Journal Information:: Frontiers in Microbiology, Vol. 6; ISSN 1664-302X

Publisher:: Frontiers Research FoundationCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 66 works

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Journal Article · Tue Apr 30 00:00:00 EDT 2019 · Frontiers in Microbiology · OSTI ID:1222486

Sorensen, Patrick O.; Bhatnagar, Jennifer M.; Christenson, Lynn; +7 more

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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

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

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