Journal
WATER
Volume 14, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/w14091417
Keywords
residual mulch film; plastic pollution; mulch film amount; annual precipitation; planting pattern
Categories
Funding
- Scientific Research Foundation of Hunan Provincial Education Department [19B268]
- Changsha Municipal Natural Science Foundation [kq2202233]
- Science and technology innovation leading plan of high-tech industry in Hunan Province [2021GK4055]
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Plastic pollution caused by the increasing use of mulch film has severely affected agricultural production and poses a great threat to the environmental safety and health. Urgent measures are needed to prevent and control plastic pollution in the soils of Sichuan Province.
With the continuous increase in the amount of mulch film, white pollution caused by plastic fragments (PF) has seriously affected agricultural production progress and poses a great threat to the safety and health of the agricultural environment. In the present study, PFs collected from 20 mulched agricultural farmlands in Sichuan Province were investigated. The PFs were separated and screened following the density flotation method. Optical microscopy was used to assess the fragments' distribution, abundance, color, size, and morphology, and Raman spectroscopy was used to identify the types. In addition, through the analysis of a questionnaire survey, a random forest (RF) model was conducted to assess the effects of environmental factors on the amount of PF. The results showed that the abundance of PFs was the highest in Lade Town, Zigong City, reaching 1158.33 +/- 52.04 particles kg(-1). Meanwhile, PFs were less abundant in Foyin Town, Luzhou City, with 50.00 +/- 25.00 particles kg(-1); the morphology features of PF in the cultivated soil were mainly transparent (60.06%) and flaky-like (83.41%), with sizes < 5 mm (63.61%). In total, 75% of the representative PFs were PE PFs, while PVC PFs were 25%. The RF model indicated that there were significant effects due to the total mulch film amount, annual precipitation, and planting pattern on the number of derived residues (PF). This study provides data indicating the urgent need to prevent and control plastic pollution in mulch farming, specifically in the soils of Sichuan Province.
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