Characteristics and Influencing Factors of Farmland Plastic Film Residue in Weifang City
Plastic film mulching technology is widely used in modern agricultural production,but the problem of residual film pollution is becoming more and more serious.Weifang City is a strong agricultural city in Shandong Province,and the use amount of plastic film is large.In order to clarify the status of plastic film residue in farmlands and the influencing factors affecting plastic film residue,99 positioned monitoring points were set up in 10 counties(county-level cities and districts)of Weifang City,and the soil texture,planting mode,crop type,mulching years,plastic film thickness,irrigation method,grower type and other information of each point were investigated,and also the plastic film residue amount determined by the method of taking samples from the sample builder square.The results showed that in 2021,the total plastic film coverage area of the 10 counties(county-level cities and districts)was 157.1 thousand hectare,and the total usage amount of plastic film was 10 442.4 t;the plastic film coverage area and usage amount of Qingzhou,Anqiu,Changle,Shouguang and Zhucheng were higher,but the residual amount of plastic film was higher in Zhucheng,Linqu,Changyi and Anqiu,which was higher than the average residue of 10 counties(county-level cities and dis-tricts)(23.8 kg/hm2).The residue of plastic film was affected by multi-factors,and increased with the in-crease of mulching years and the decrease of film thickness.The residue in farmlands with mulching film for more than 20 years increased by 43.02%compared with the farmlands with mulching film for 1～5 years.The residue of plastic film with the thickness of 0.010 mm reduced by 62.32%than that with the thickness of 0.004 mm.The plastic film residue in sandy and clay farmlands were higher than that in loam farmland.The residue of plastic film in farmland planted with cotton,sweet potato and yellow tobacco were high,and that under fur-row irrigation and border irrigation were significantly higher than that under sprinkler irrigation and drip irriga-tion,especially drip irrigation was the lowest.The farther away the farmland was from the residence,the high-er the plastic film residue was,and the residue in farmland>10～30 km away from the residence was 8.28 times higher than that in the farmland 0.1～0.5 km away from the residence.The plastic film residue in the farmlands planted by rural cooperatives was 36.75%higher than that of ordinary farmers.The results of this study could provide references for Weifang City to promote the prevention and control of farmland film pollu-tion.
Farmland film residueWeifang CityResidual characteristicsInfluencing factors
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