Soil Microbiome Dynamics During Pyritic Mine Tailing Phytostabilization: Understanding Microbial Bioindicators of Soil Acidification

Hottenstein, John D.; Neilson, Julie W.; Gil-Loaiza, Juliana; Root, Robert A.; White, Scott A.; Chorover, Jon; Maier, Raina M.

doi:10.3389/fmicb.2019.01211

Title: Soil Microbiome Dynamics During Pyritic Mine Tailing Phytostabilization: Understanding Microbial Bioindicators of Soil Acidification

Journal Article · Wed Jun 05 00:00:00 EDT 2019 · Frontiers in Microbiology

DOI:https://doi.org/10.3389/fmicb.2019.01211· OSTI ID:1628178

Hottenstein, John D. ^[1]; Neilson, Julie W. ^[1]; Gil-Loaiza, Juliana ^[1]; Root, Robert A. ^[1]; White, Scott A. ^[1]; Chorover, Jon ^[1]; Maier, Raina M. ^[1]

Univ. of Arizona, Tucson, AZ (United States)

Challenges to the reclamation of pyritic mine tailings arise from in situ acid generation that severely constrains the growth of natural revegetation. While acid mine drainage (AMD) microbial communities are well-studied under highly acidic conditions, fewer studies document the dynamics of microbial communities that generate acid from pyritic material under less acidic conditions that can allow establishment and support of plant growth. This research characterizes the taxonomic composition dynamics of microbial communities present during a 6-year compost-assisted phytostabilization field study in extremely acidic pyritic mine tailings. A complementary microcosm experiment was performed to identify successional community populations that enable the acidification process across a pH gradient. Taxonomic profiles of the microbial populations in both the field study and microcosms reveal shifts in microbial communities that play pivotal roles in facilitating acidification during the transition between moderately and highly acidic conditions. The potential co-occurrence of organoheterotrophic and lithoautotrophic energy metabolisms during acid generation suggests the importance of both groups in facilitating acidification. Taken together, this research suggests that key microbial populations associated with pH transitions could be used as bioindicators for either sustained future plant growth or for acid generation conditions that inhibit further plant growth.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Institute of Environmental and Health Sciences (NIEHS)

Grant/Contract Number:: AC02-76SF00515; P42 ES004940

OSTI ID:: 1628178

Journal Information:: Frontiers in Microbiology, Vol. 10; ISSN 1664-302X

Publisher:: Frontiers Research FoundationCopyright Statement

Country of Publication:: United States

Language:: English

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59 BASIC BIOLOGICAL SCIENCES
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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plant growth-promoting bacteria
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sulfur-oxidizing bacteria
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Title: Soil Microbiome Dynamics During Pyritic Mine Tailing Phytostabilization: Understanding Microbial Bioindicators of Soil Acidification

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