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Increased N2O emissions by the soil nematode community cannot be fully explained by enhanced mineral N availability

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Abstract
Soil nematodes are the most abundant soil fauna, with a potential great impact on soil N mineralization via interaction with soil microorganisms. As a consequence, nematodes likely also influence soil N2O production and emission but the very few studies on this matter were carried out in simplified setups with single nematode species and in (highly) disturbed soil conditions. Here we measured soil N2O emissions in a 74-day incubation experiment in the presence or absence of the entire soil nematode community with minimal disturbance of the soil microbial community and soil nutrients. This was e.g. evidenced by readily recovery of nitrifiers after the mild and selective sterilization and soil powder inoculation. N2O emissions increased in the presence of nematodes, varying between soils +747.7 % in a loamy sand, +55.8 % in a loam, and +51.9 % in a silt loam cropland topsoil, in line with nematode abundance in these soils. In particular, the loamy sand soil showed an atypical N2O emission peak at the time of high nematode abundance. Soil nematodes also increased net N mineralization by +8.4, +6.8 and +4.75 %, in these respective soils and to a smaller extent C mineralization as well. The extra soil nitrate buildup and the overall net stimulation of N mineralization by nematodes could not or just slightly explain the observed increased N2O emission. This research revealed the important role of soil nematodes in regulating N2O emission, and further stresses the need to consider the change in community composition and activity of denitrifiers, and connectivity of soil pores, rather than the stimulation of N mineralization as potential explanations for this role of nematodes.
Keywords
Soil nematode community, N2O emission, Soil N mineralization, Soil texture, Microcosm, NITROUS-OXIDE EMISSIONS, FREE-LIVING NEMATODES, BACTERIAL-FEEDING NEMATODES, GREENHOUSE-GAS EMISSIONS, HABITABLE PORE-SPACE, GAMMA-IRRADIATION, BACTERIVOROUS NEMATODES, TROPHIC INTERACTIONS, MICROBIAL COMMUNITY, NEMATOPHAGOUS FUNGI

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MLA
Hu, Junwei, et al. “Increased N2O Emissions by the Soil Nematode Community Cannot Be Fully Explained by Enhanced Mineral N Availability.” SOIL BIOLOGY & BIOCHEMISTRY, vol. 191, 2024, doi:10.1016/j.soilbio.2024.109314.
APA
Hu, J., Kong, M., Françoys, A., Yarahmadi, F., Mendoza Aguirre, O. M., Hassi, U., … De Neve, S. (2024). Increased N2O emissions by the soil nematode community cannot be fully explained by enhanced mineral N availability. SOIL BIOLOGY & BIOCHEMISTRY, 191. https://doi.org/10.1016/j.soilbio.2024.109314
Chicago author-date
Hu, Junwei, Meng Kong, Astrid Françoys, Farideh Yarahmadi, Orly Milton Mendoza Aguirre, Ummehani Hassi, Mesfin Tsegaye Gebremikael, Wim Wesemael, Steven Sleutel, and Stefaan De Neve. 2024. “Increased N2O Emissions by the Soil Nematode Community Cannot Be Fully Explained by Enhanced Mineral N Availability.” SOIL BIOLOGY & BIOCHEMISTRY 191. https://doi.org/10.1016/j.soilbio.2024.109314.
Chicago author-date (all authors)
Hu, Junwei, Meng Kong, Astrid Françoys, Farideh Yarahmadi, Orly Milton Mendoza Aguirre, Ummehani Hassi, Mesfin Tsegaye Gebremikael, Wim Wesemael, Steven Sleutel, and Stefaan De Neve. 2024. “Increased N2O Emissions by the Soil Nematode Community Cannot Be Fully Explained by Enhanced Mineral N Availability.” SOIL BIOLOGY & BIOCHEMISTRY 191. doi:10.1016/j.soilbio.2024.109314.
Vancouver
1.
Hu J, Kong M, Françoys A, Yarahmadi F, Mendoza Aguirre OM, Hassi U, et al. Increased N2O emissions by the soil nematode community cannot be fully explained by enhanced mineral N availability. SOIL BIOLOGY & BIOCHEMISTRY. 2024;191.
IEEE
[1]
J. Hu et al., “Increased N2O emissions by the soil nematode community cannot be fully explained by enhanced mineral N availability,” SOIL BIOLOGY & BIOCHEMISTRY, vol. 191, 2024.
@article{01HNWC2YZWG87PPC4EDAMSRMJE,
  abstract     = {{Soil nematodes are the most abundant soil fauna, with a potential great impact on soil N mineralization via interaction with soil microorganisms. As a consequence, nematodes likely also influence soil N2O production and emission but the very few studies on this matter were carried out in simplified setups with single nematode species and in (highly) disturbed soil conditions. Here we measured soil N2O emissions in a 74-day incubation experiment in the presence or absence of the entire soil nematode community with minimal disturbance of the soil microbial community and soil nutrients. This was e.g. evidenced by readily recovery of nitrifiers after the mild and selective sterilization and soil powder inoculation. N2O emissions increased in the presence of nematodes, varying between soils +747.7 % in a loamy sand, +55.8 % in a loam, and +51.9 % in a silt loam cropland topsoil, in line with nematode abundance in these soils. In particular, the loamy sand soil showed an atypical N2O emission peak at the time of high nematode abundance. Soil nematodes also increased net N mineralization by +8.4, +6.8 and +4.75 %, in these respective soils and to a smaller extent C mineralization as well. The extra soil nitrate buildup and the overall net stimulation of N mineralization by nematodes could not or just slightly explain the observed increased N2O emission. This research revealed the important role of soil nematodes in regulating N2O emission, and further stresses the need to consider the change in community composition and activity of denitrifiers, and connectivity of soil pores, rather than the stimulation of N mineralization as potential explanations for this role of nematodes.}},
  articleno    = {{109314}},
  author       = {{Hu, Junwei and Kong, Meng and Françoys, Astrid and Yarahmadi, Farideh and Mendoza Aguirre, Orly Milton and Hassi, Ummehani and Gebremikael, Mesfin Tsegaye and Wesemael, Wim and Sleutel, Steven and De Neve, Stefaan}},
  issn         = {{0038-0717}},
  journal      = {{SOIL BIOLOGY & BIOCHEMISTRY}},
  keywords     = {{Soil nematode community,N2O emission,Soil N mineralization,Soil texture,Microcosm,NITROUS-OXIDE EMISSIONS,FREE-LIVING NEMATODES,BACTERIAL-FEEDING NEMATODES,GREENHOUSE-GAS EMISSIONS,HABITABLE PORE-SPACE,GAMMA-IRRADIATION,BACTERIVOROUS NEMATODES,TROPHIC INTERACTIONS,MICROBIAL COMMUNITY,NEMATOPHAGOUS FUNGI}},
  language     = {{eng}},
  pages        = {{13}},
  title        = {{Increased N2O emissions by the soil nematode community cannot be fully explained by enhanced mineral N availability}},
  url          = {{http://doi.org/10.1016/j.soilbio.2024.109314}},
  volume       = {{191}},
  year         = {{2024}},
}

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