Common use herbicides increase wetland greenhouse gas emissions.

Autor: Cornish CM; Environmental and Conservation Sciences, North Dakota State University, 1340 Administration Avenue, Fargo, ND 58105, United States. Electronic address: christine.cornish@ndsu.edu., Johnson OF; U.S. Geological Survey, Northern Prairie Wildlife Research Center, Jamestown, ND, United States; Department of Biological Sciences, Kent State University, Kent, OH, United States., Bansal S; U.S. Geological Survey, Northern Prairie Wildlife Research Center, Jamestown, ND, United States., Meier JA; U.S. Geological Survey, Northern Prairie Wildlife Research Center, Jamestown, ND, United States., Harris TD; Kansas Biological Survey and Center for Ecological Research, Lawrence, KS, United States., Sweetman JN; Department of Ecosystem Science and Management, The Pennsylvania State University, 457 ASI Building, University Park, PA 16802, United States.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2024 Jul 10; Vol. 933, pp. 172881. Date of Electronic Publication: 2024 May 01.
DOI: 10.1016/j.scitotenv.2024.172881
Abstrakt: Wetlands play a disproportionate role in the global climate as major sources and sinks of greenhouse gases. Herbicides are the most heavily used agrochemicals and are frequently detected in aquatic ecosystems, with glyphosate and 2,4-Dichlorophenoxyacetic acid (2,4-D), representing the two most commonly used worldwide. In recent years, these herbicides are being used in mixtures to combat herbicide-tolerant noxious weeds. While it is well documented that herbicide use for agriculture is expected to increase, their indirect effects on wetland greenhouse gas dynamics are virtually unknown. To fill this knowledge gap, we conducted a factorial microcosm experiment using low, medium, and high concentrations of glyphosate or 2,4-D, individually and in combination to investigate their effects on wetland methane, carbon dioxide, and nitrous oxide fluxes. We predicted that mixed herbicide treatments would have a synergistic effect on greenhouse gases compared to individual herbicides. Our results showed that carbon dioxide flux rates and cumulative emissions significantly increased from both individual and mixed herbicide treatments, whereas methane and nitrous oxide dynamics were less affected. This study suggests that extensive use of glyphosate and 2,4-D may increase carbon dioxide emissions from wetlands, which could have implications for climate change.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 The Authors. Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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