N2O production is influenced by the abundance of nitrite-reducers and N2O-reducers in casts produced by a large variety of tropical earthworm species
2024
Zi, Yacouba | van Pham, Quang | Bottinelli, Nicolas | Capowiez, Yvan | Cantarel, Amélie | Rumpel, Cornelia | Florio, Alessandro | Institut d'écologie et des sciences de l'environnement de Paris (iEES Paris) ; Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Soils and Fertilizers Research Institute (SFRI) ; Vietnam Academy of Agricultural Sciences (VAAS) | Vietnam National University [Hanoï] (VNU) | Environnement Méditerranéen et Modélisation des Agro-Hydrosystèmes (EMMAH) ; Avignon Université (AU)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Laboratoire d'Ecologie Microbienne - UMR 5557 (LEM) ; Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-Ecole Nationale Vétérinaire de Lyon (ENVL)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | ANR-20-CE01-0015,U2WORM,Comprendre et utiliser les services écosystémiques fournis par les vers de terre(2020) | ANR-19-CE01-0003,PRECIOUS,Prévoir les transferts d'eau via de nouveaux groupes fonctionnels de vers de terre(2019)
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Mostrar más [+] Menos [-]Inglés. We investigated the potential of earthworm casts to emit N2O, hypothesizing that emission levels are influenced by the species of earthworm and their ecological category. This study examined casts a broad taxonomic and ecological coverage of tropical earthworms, i.e., 16 different species across four ecological categories. We quantified the potential nitrification, N2O production and consumption as well as the abundance of N-related microbial functional groups, including ammonia-oxidizers, nitrite-reducers, and distinct clades of N2O-reducers, along with casts chemical properties to determine cast organic matter quality and substrate availability. Earthworm casts exhibited significantly higher concentrations of carbon, nitrogen, and nitrate compared to control soil, while humification index were lower. A negative correlation between humification index and potential N2O production suggests that more labile substrates in the casts promote higher N2O flux. Net potential N2O emissions were higher in the casts of 7 out of 16 species compared to control soil, and all species' casts showed higher gross potential N2O production, with substantial interspecific variability. The abundance of nitrite and N2O reducers was significantly higher in the casts and positively correlated with potential N2O emissions. Casts from epigeic and mixed categories displayed higher carbon and nitrogen content, abundance of nitrite and N2O reducers, ammonia-oxidizing bacteria, and potential N2O production compared to anecic and endogeic categories, which exhibited higher values of humification index. Structural equation modeling indicated that gross potential N2O production was primarily explained by the abundance of nitrite reducers and substrate availability indicators such as humification index and nitrate concentration. Our study demonstrates significant interspecific variability in N2O potential emissions from a broad range of tropical earthworm casts, influenced by species feeding behavior, microbial communities, and substrate availability.
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