Effects of Plastic Film Mulching on Vegetable Production and Farmland Environment
Traditional polyethylene film mulching has the functions of heat preservation,moisture conservation and weeding,and plays an important role in vegetable production.However,with the promotion of plastic film mulching technology and the lack of effective recovery of plastic film after use,the residual amount of plastic film in soil is increasing year by year,and the negative impact is becoming more and more obvious.The residue of traditional polyethylene mulch film in soil will block soil capillary,cut off water and gas migration and exchange channels,change soil porosity and destroy soil structure.In the vicinity of the vegetable root system,there will be effects such as encapsulation and obstruction,which will inhibit the growth of the root system,and then reduce the growth of the above-ground part of the plant and the metabolic level of the leaves,resulting in a decrease in yield and restricting the sustainable production of vegetables.At the same time,the residual film in the soil is aged and cracked into micro/nanoplastics with tillage and time,which enters plants and animals and poses a potential threat to human health.Biodegradable mulch film,which can be decomposed into carbon dioxide and water by microorganisms under natural conditions,effectively alleviates this crisis.It not only has the functions of increasing temperature and preserving soil moisture,but also can promote crop growth and effectively alleviate white pollution,which has great application prospects.However,due to the immature technology,the degradation performance is greatly affected by environmental conditions,the degradation rate is difficult to control,and the cost is high.It is difficult to promote and still faces many challenges.
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