Degradation of agricultural biodegradable plastics in the soil under laboratory conditions

共聚酯 聚乳酸 生物降解 材料科学 聚乙烯 淀粉 热塑性塑料 生物可分解塑胶 聚羟基丁酸酯 护根物 可生物降解聚合物 复合材料 聚合物 农学 化学 聚酯纤维 有机化学 生物 细菌 遗传学
作者
D. H. Barragán,A.M. Pelacho,L. Martín-Closas
出处
期刊:Soil Research 卷期号:54 (2): 216-216 被引量:60
标识
DOI:10.1071/sr15034
摘要

Mulches, usually consisting of polyethylene films, are used in agriculture to improve production. The main drawback of using polyethylene is its extremely high stability. Removing it from the field is usually not feasible, and so wastes remain accumulating in the field and pollute the environment. As an alternative, five potentially biodegradable plastic films for mulching (maize thermoplastic starch–copolyester, cereal flour–copolyester, polylactic acid–copolyester, polyhydroxybutyrate, and potato thermoplastic starch–copolyester) were tested to evaluate their degradation in an agricultural soil. Polyethylene film was used as control. A soil burial test was carried out during 6 months under laboratory conditions and film weight loss, chemical changes and soil microbial activity were monitored. Weight loss was fastest for the polyhydroxybutyrate film, followed by potato thermoplastic starch–copolyester and cereal flour–copolyester. Maize thermoplastic starch–copolyester and polylactic acid–copolyester required 5–6 months to disintegrate. Concomitant to the weight loss, chemical changes in the films and an increase in soil microbial activity were noticed. From the disintegration and biodegradation results of the biodegradable tested films, it is concluded that these films are an alternative for avoiding the soil pollution drawbacks of the polyethylene mulching films.
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