Characteristics and key influencing factors of farmland plastic film residual in six provinces of northwest China
In order to explore the characteristics and influence factors of farmland plastic film residual in six provinces of northwest China,a total of 160 monitoring sites were established in Xinjiang,Inner Mongolia,Qinghai,Ningxia,Shaanxi,and Gansu from 2020 to 2022.Typical sample collection methods were used to carry out mulch film residue monitoring.As well,background information was collected from farmers for the purpose of carrying out a questionnaire survey.The results showed that the amount of plastic film residue ranged from 0.46 kg·hm-2 to 369.29 kg·hm-2 among the 160 monitoring sites,with an average of 70.30 kg·hm-2,which was close to the national standard limit of 75 kg·hm-2.The differences among the different provinces in terms of the amount of residual plastic film were significant(P<0.05).The monitoring points with a high degree of pollution were mainly located in Xinjiang and Inner Mongolia,whereas residual film pollution was found to be relatively light in Shaanxi,Qinghai,Gansu and Ningxia.The amount of residual soil film was observed to be positively correlated with the film mulching years,with thicker film resulting in smaller residue amounts.Significant differences were detected under different crop types and film coverage ratios,being greatly influenced by diverse factors,including recovery methods,farmer types and their distances from plot to village,and soil texture types.The contribution rates of the main factors affecting the residual film amount were as follows:recovery methods(30.8% ),crop types(15.2% ),film coverage ratio(13.8% ),and film mulching years(10.8% ).The contribution rates of farmer types,distances from plot to village,soil texture types,and film thickness to the residual film amount in farmlands were all below 10% .The results show that there is a high risk of plastic film pollution in six provinces of northwest China.It is recommended that prevention and control efforts be strengthened according to local conditions.It is suggested to enhance and promote technologies for preventing and controlling plastic film pollution.More importantly,the local government should refine prevention and control policies for plastic film while fully considering the interests of farmers.
plastic film residual of farmlandinfluence factorcontribution ratiosix provinces of northwest China
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