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Title: Restoring wetlands on intensive agricultural lands modifies nitrogen cycling microbial communities and reduces N2O production potential

Abstract

The concentration of nitrous oxide (N2O), an ozone-depleting greenhouse gas, is rapidly increasing in the atmosphere. Most atmospheric N2O originates in terrestrial ecosystems, of which the majority can be attributed to microbial cycling of nitrogen in agricultural soils. Here, in this study, we demonstrate how the abundance of nitrogen cycling genes vary across intensively managed agricultural fields and adjacent restored wetlands in the Sacramento-San Joaquin Delta in California, USA. We found that the abundances of nirS and nirK genes were highest at the intensively managed organic-rich cornfield and significantly outnumber any other gene abundances, suggesting very high N2O production potential. The quantity of nitrogen transforming genes, particularly those responsible for denitrification, nitrification and DNRA, were highest in the agricultural sites, whereas nitrogen fixation and ANAMMOX was strongly associated with the wetland sites. Although the abundance of nosZ genes was also high at the agricultural sites, the ratio of nosZ genes to nir genes was significantly higher in wetland sites indicating that these sites could act as a sink of N2O. These findings suggest that wetland restoration could be a promising natural climate solution not only for carbon sequestration but also for reduced N2O emissions.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4]; ORCiD logo [5];  [2];  [1]; ORCiD logo [1];  [6]; ORCiD logo [2]; ORCiD logo [2];  [2]
  1. University of Tartu (Estonia)
  2. Univ. of California, Berkeley, CA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Agroscope (Switzerland)
  5. Stanford Univ., CA (United States)
  6. Univ. of Illinois, Chicago, IL (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER); USDA; Estonian Research Council; European Union (EU)
OSTI Identifier:
1902116
Grant/Contract Number:  
AC02-05CH11231; 7079856; 2011-67003-30371; PSG631; PRG352; MOBERC20
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Environmental Management
Additional Journal Information:
Journal Volume: 299; Journal ID: ISSN 0301-4797
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; Functional genes; Land use change; Land management; Nitrogen fixation; Denitrification; Ammonia oxidation

Citation Formats

Kasak, Kuno, Espenberg, Mikk, Anthony, Tyler L., Tringe, Susannah G., Valach, Alex C., Hemes, Kyle S., Silver, Whendee L., Mander, Ülo, Kill, Keit, McNicol, Gavin, Szutu, Daphne, Verfaillie, Joseph, and Baldocchi, Dennis D. Restoring wetlands on intensive agricultural lands modifies nitrogen cycling microbial communities and reduces N2O production potential. United States: N. p., 2021. Web. doi:10.1016/j.jenvman.2021.113562.
Kasak, Kuno, Espenberg, Mikk, Anthony, Tyler L., Tringe, Susannah G., Valach, Alex C., Hemes, Kyle S., Silver, Whendee L., Mander, Ülo, Kill, Keit, McNicol, Gavin, Szutu, Daphne, Verfaillie, Joseph, & Baldocchi, Dennis D. Restoring wetlands on intensive agricultural lands modifies nitrogen cycling microbial communities and reduces N2O production potential. United States. https://doi.org/10.1016/j.jenvman.2021.113562
Kasak, Kuno, Espenberg, Mikk, Anthony, Tyler L., Tringe, Susannah G., Valach, Alex C., Hemes, Kyle S., Silver, Whendee L., Mander, Ülo, Kill, Keit, McNicol, Gavin, Szutu, Daphne, Verfaillie, Joseph, and Baldocchi, Dennis D. Fri . "Restoring wetlands on intensive agricultural lands modifies nitrogen cycling microbial communities and reduces N2O production potential". United States. https://doi.org/10.1016/j.jenvman.2021.113562. https://www.osti.gov/servlets/purl/1902116.
@article{osti_1902116,
title = {Restoring wetlands on intensive agricultural lands modifies nitrogen cycling microbial communities and reduces N2O production potential},
author = {Kasak, Kuno and Espenberg, Mikk and Anthony, Tyler L. and Tringe, Susannah G. and Valach, Alex C. and Hemes, Kyle S. and Silver, Whendee L. and Mander, Ülo and Kill, Keit and McNicol, Gavin and Szutu, Daphne and Verfaillie, Joseph and Baldocchi, Dennis D.},
abstractNote = {The concentration of nitrous oxide (N2O), an ozone-depleting greenhouse gas, is rapidly increasing in the atmosphere. Most atmospheric N2O originates in terrestrial ecosystems, of which the majority can be attributed to microbial cycling of nitrogen in agricultural soils. Here, in this study, we demonstrate how the abundance of nitrogen cycling genes vary across intensively managed agricultural fields and adjacent restored wetlands in the Sacramento-San Joaquin Delta in California, USA. We found that the abundances of nirS and nirK genes were highest at the intensively managed organic-rich cornfield and significantly outnumber any other gene abundances, suggesting very high N2O production potential. The quantity of nitrogen transforming genes, particularly those responsible for denitrification, nitrification and DNRA, were highest in the agricultural sites, whereas nitrogen fixation and ANAMMOX was strongly associated with the wetland sites. Although the abundance of nosZ genes was also high at the agricultural sites, the ratio of nosZ genes to nir genes was significantly higher in wetland sites indicating that these sites could act as a sink of N2O. These findings suggest that wetland restoration could be a promising natural climate solution not only for carbon sequestration but also for reduced N2O emissions.},
doi = {10.1016/j.jenvman.2021.113562},
journal = {Journal of Environmental Management},
number = ,
volume = 299,
place = {United States},
year = {Fri Aug 20 00:00:00 EDT 2021},
month = {Fri Aug 20 00:00:00 EDT 2021}
}

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