Universal microbial reworking of dissolved organic matter along environmental gradients.

Autor: Freeman EC; Ecosystems and Global Change Group, Department of Plant Sciences, University of Cambridge, Cambridge, CB2 3EA, UK. erika.freem@gmail.com., Emilson EJS; Natural Resources Canada, Canadian Forest Service, Great Lakes Forestry Centre, 1219 Queen St. E., Sault Ste, Marie, ON, P6A 2E5, Canada.; Ecosystems and Global Change Group, School of the Environment, Trent University, Peterborough, ON, K9L 0G2, Canada., Dittmar T; Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, 26129, Oldenburg, Germany.; Helmholtz Institute for Functional Marine Biodiversity, University of Oldenburg, 26129, Oldenburg, Germany., Braga LPP; Ecosystems and Global Change Group, Department of Plant Sciences, University of Cambridge, Cambridge, CB2 3EA, UK., Emilson CE; Natural Resources Canada, Canadian Forest Service, Great Lakes Forestry Centre, 1219 Queen St. E., Sault Ste, Marie, ON, P6A 2E5, Canada., Goldhammer T; Department of Ecohydrology and Biogeochemistry, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Mueggelseedamm, 301, Berlin, Germany., Martineau C; Natural Resources Canada, Laurentian Forestry Centre, 1055 Du P.E.P.S. Street, P.O. Box 10380, Québec, G1V 4C7, Canada., Singer G; Department of Ecology, University of Innsbruck, Technikerstrasse 25, 6020, Innsbruck, Austria., Tanentzap AJ; Ecosystems and Global Change Group, Department of Plant Sciences, University of Cambridge, Cambridge, CB2 3EA, UK.; Ecosystems and Global Change Group, School of the Environment, Trent University, Peterborough, ON, K9L 0G2, Canada.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2024 Jan 02; Vol. 15 (1), pp. 187. Date of Electronic Publication: 2024 Jan 02.
DOI: 10.1038/s41467-023-44431-4
Abstrakt: Soils are losing increasing amounts of carbon annually to freshwaters as dissolved organic matter (DOM), which, if degraded, can offset their carbon sink capacity. However, the processes underlying DOM degradation across environments are poorly understood. Here we show DOM changes similarly along soil-aquatic gradients irrespective of environmental differences. Using ultrahigh-resolution mass spectrometry, we track DOM along soil depths and hillslope positions in forest catchments and relate its composition to soil microbiomes and physico-chemical conditions. Along depths and hillslopes, we find carbohydrate-like and unsaturated hydrocarbon-like compounds increase in abundance-weighted mass, and the expression of genes essential for degrading plant-derived carbohydrates explains >50% of the variation in abundance of these compounds. These results suggest that microbes transform plant-derived compounds, leaving DOM to become increasingly dominated by the same (i.e., universal), difficult-to-degrade compounds as degradation proceeds. By synthesising data from the land-to-ocean continuum, we suggest these processes generalise across ecosystems and spatiotemporal scales. Such general degradation patterns can help predict DOM composition and reactivity along environmental gradients to inform management of soil-to-stream carbon losses.
(© 2024. The Author(s).)
Databáze: MEDLINE
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