Microcosm biology11/29/2023 ![]() ![]() The trend in methane uptake could be explained by the soluble ammonium concentration, which was proportionate to the supplemented ammonium in the soil enrichment. While NH4Cl significantly stimulated the methanotrophic activity at all concentrations in the soil slurry incubation, methane uptake showed a dose-dependent effect in the soil enrichment. Ammonium was supplemented as NH4Cl at 0.5–4.75gL−1 after pre-incubation. To reduce adsorption (exchangeable) sites for ammonium in a paddy soil, two successive pre-incubation steps were introduced resulting in a 1000-fold soil dilution (soil enrichment), to be compared to a soil slurry (tenfold dilution) incubation. We postulate that the effects of ammonium on the methanotrophic activity in soil are more accurately portrayed by relating methane uptake rates to the soluble ammonium (bioavailable), rather than the exchangeable (total) ammonium. We hypothesize that this inconsistency may stem from the discrepancy in the cation adsorption capacity of the soil. Collectively, our results showed that the soluble, rather than the exchangeable ammonium concentration, is relevant when determining the effects of ammonium on methane oxidation, but this does not exclude other (a)biotic factors concurrently influencing methanotrophic activity.Ībstract = "Ammonium-induced stimulatory, inhibitory, and/or neutral effects on soil methane oxidation have been attributable to the ammonium concentration and mineral forms, confounded by other edaphic properties (e.g., pH, salinity), as well as the site-specific composition of the methanotrophic community. Accordingly, Methylosarcina was found to predominate the methanotrophic community after the incubation, suggesting the relevance of this methanotroph at elevated ammonium levels (< 3.25gL−1 NH4Cl). In the soil slurry incubation, a fraction (36–63%) of the supplemented ammonium was determined to be adsorbed to the soil. ![]() She was a Postdoctoral fellow at the Biodiversity Research Centre at the University of British Columbia in Canada.Ammonium-induced stimulatory, inhibitory, and/or neutral effects on soil methane oxidation have been attributable to the ammonium concentration and mineral forms, confounded by other edaphic properties (e.g., pH, salinity), as well as the site-specific composition of the methanotrophic community. ![]() in ecology from the Pontificia Universidad Catolica de Chile in Chile. She holds a bachelor’s degree in biology and a Master in zoology from the Universidad de Concepcion in Chile, and a Ph.D. Her research is being supported by two NSF DEB awards, including a highly prestigious NSF CAREER award, and two awards from the German Centre for Integrative Biodiversity Research (iDiv). She was the Chair of the 2022 Gordon Research Conference (GRC) on Unifying Ecology Across Scales. Her work combines theory, observations, experiments, and data synthesis approaches to help predict ecological patterns and processes across space and time. Drawing from general principles, González aims to develop a more integrated understanding of ecological systems. Much of her research is concerned with the effects of natural and human-induced environmental changes on the diversity, composition and function of communities and ecosystems. González is a broadly trained ecologist with interests that range from organismal traits to community and ecosystem ecology. González got tenure recently, being the first female professor getting tenure in her department. Angélica González is an Associate Professor in the Department of Biology and the Center for Computational and Integrative Biology at Rutgers University. ![]()
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |