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Title: Microbial Potential for Ecosystem N Loss Is Increased by Experimental N Deposition

Journal Article · · PLoS ONE
ORCiD logo [1];  [2];  [2];  [3]
  1. Univ. of Michigan, Ann Arbor, MI (United States); West Virginia Univ., Morgantown, WV (United States)
  2. Univ. of Michigan, Ann Arbor, MI (United States)
  3. National Taiwan Univ. (Taiwan)

Fossil fuel combustion and fertilizer use has increased the amount of biologically available N entering terrestrial ecosystems. Nonetheless, our understanding of how anthropogenic N may alter the physiological mechanisms by which soil microorganisms cycle N in soil is still developing. Here, we applied shotgun metagenomics to a replicated long-term field experiment to determine how two decades of experimental N deposition, at a rate expected by mid-century, has affected the genetic potential of the soil microbial community to cycle N in soils. Experimental N deposition lead to a significant and persistent increase in functional assemblages mediating N cycle transformations associated with ecosystem N loss (i.e., denitrification and nitrification), whereas functional assemblages associated with N input and retention (i.e., N fixation and microbial N assimilation) were less positively affected. Furthermore, the abundance and composition of microbial taxa, as well as functional assemblages involved in housekeeping functions (i.e., DNA replication) were unaffected by experimental N deposition. Here taken together, our results suggest that functional genes and gene pathways associated with ecosystem N loss have been favored by experimental N deposition, which may represent a genetic mechanism fostering increased N loss as anthropogenic N deposition increases in the future.

Research Organization:
West Virginia Univ., Morgantown, WV (United States)
Sponsoring Organization:
USDOE; Biological and Environmental Research (BER)
OSTI ID:
1377882
Journal Information:
PLoS ONE, Vol. 11, Issue 10; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 9 works
Citation information provided by
Web of Science

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Limited Ecosystem Recovery from Simulated Chronic Nitrogen Deposition
  • Bowman, William D.; Ayyad, Asma; Bueno de Mesquita, Clifton P.
  • The Bulletin of the Ecological Society of America, Vol. 100, Issue 1 https://doi.org/10.1002/bes2.1447
journal January 2019
Stoichiometric Shifts in Soil C:N:P Promote Bacterial Taxa Dominance, Maintain Biodiversity, and Deconstruct Community Assemblages journal July 2018
Limited ecosystem recovery from simulated chronic nitrogen deposition journal September 2018