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

Junwei Hu; Meng Kong; Astrid  Francoys; Farideh  Yarahmadi; Orly  Mendoza; Ummehani Hassi; Mesfin Tsegaye Gebremikael; Wim M.L.  Wesemael; Steven  Sleutel; Stefaan   De Neve

doi:10.1016/j.soilbio.2024.109314

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

Junwei Hu, Meng Kong, Astrid Francoys, Farideh Yarahmadi, Orly Mendoza, Ummehani Hassi, Mesfin Tsegaye Gebremikael, Wim M.L. Wesemael, Steven Sleutel, Stefaan De Neve

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

4 Citations (Scopus)

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.

Original language	English
Article number	109314
Journal	Soil Biology & Biochemistry
Volume	191
ISSN	0038-0717
DOIs	https://doi.org/10.1016/j.soilbio.2024.109314
Publication status	Published - Apr 2024

Keywords

Microcosm
N O emission
Soil N mineralization
Soil nematode community
Soil texture

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10.1016/j.soilbio.2024.109314

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

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 = "Microcosm, N O emission, Soil N mineralization, Soil nematode community, Soil texture",

author = "Junwei Hu and Meng Kong and Astrid Francoys and Farideh Yarahmadi and Orly Mendoza and Ummehani Hassi and Gebremikael, {Mesfin Tsegaye} and Wesemael, {Wim M.L.} and Steven Sleutel and {De Neve}, Stefaan",

year = "2024",

month = apr,

doi = "10.1016/j.soilbio.2024.109314",

language = "English",

volume = "191",

journal = "Soil Biology & Biochemistry",

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Increased N2O emissions by the soil nematode community cannot be fully explained by enhanced mineral N availability. / Hu, Junwei; Kong, Meng; Francoys, Astrid et al.
In: Soil Biology & Biochemistry, Vol. 191, 109314, 04.2024.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

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T1 - Increased N2O emissions by the soil nematode community cannot be fully explained by enhanced mineral N availability

AU - Hu, Junwei

AU - Kong, Meng

AU - Francoys, Astrid

AU - Yarahmadi, Farideh

AU - Mendoza, Orly

AU - Hassi, Ummehani

AU - Gebremikael, Mesfin Tsegaye

AU - Wesemael, Wim M.L.

AU - Sleutel, Steven

AU - De Neve, Stefaan

PY - 2024/4

Y1 - 2024/4

N2 - 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.

AB - 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.

KW - Microcosm

KW - N O emission

KW - Soil N mineralization

KW - Soil nematode community

KW - Soil texture

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DO - 10.1016/j.soilbio.2024.109314

M3 - Journal article

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VL - 191

JO - Soil Biology & Biochemistry

JF - Soil Biology & Biochemistry

M1 - 109314

ER -

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

Abstract

Keywords

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