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Advances in researches of the mulch-film degradation and the underlying mechanism.
Summary
This review examines how plastic mulch films degrade in agricultural soils, covering the physical, chemical, and biological processes involved. Researchers found that residual plastic fragments accumulate in soils over repeated growing seasons and may affect soil structure, water movement, and microbial communities.
Mulch-filmaccounted for more than half of plastic film used in Chinese agriculture. The wide utilization of mulch-film brings great economic value but also causes "white pollution". The residual film is difficult to be recycled and degraded, which directly affects soil regeneration. We introduced the current status of the plastic film usage in China and reviwed the research progress in its degradation. The biological and non-biological pathways and mechanisms of mulch-film degradation were summarized, with particular focus on the polyolefin degradation with synergistic effect of photocatalysis, metal ion doping as well as the impacts of different sources of bacteria and enzymes on the degradation efficiency of polyolefins. The more efficient degradation methods of plastic film are prospected. This review would provide reference for the further studies of plastic film degradation and microplastic degradation.