Articles | Volume 20, issue 19
https://doi.org/10.5194/bg-20-4213-2023
https://doi.org/10.5194/bg-20-4213-2023
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13 Oct 2023
Research article | Highlight paper |  | 13 Oct 2023

Soil-biodegradable plastic films do not decompose in a lake sediment over 9 months of incubation

Sigrid van Grinsven and Carsten Schubert

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Latest update: 13 Dec 2024
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Co-editor-in-chief
The findings of this study are interesting to a broader audience as it demonstrates that supposedly biodegradable mulch films used for agricultural purposes remain unchanged in lake sediments over several months. The results indicate that lake sediments are a place of long-term storage rather than a place of degradation for this form of plastic.
Short summary
Agriculture relies heavily on plastic mulch films, which may be transported to aquatic environments. We investigated the breakdown of soil-biodegradable agricultural mulch films in lake sediments. After 40 weeks, films were intact, and no significant CO2 or CH4 was produced from the biodegradable mulch films. We conclude that the mulch films we used have a low biodegradability in lake sediments. The sediment lacks the microbes needed to break down the biodegradable plastics that were used here.
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