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地膜覆盖栽培技术引进示范与推广应用已有23年历史,目前覆盖量达1.5亿亩。鉴于塑料废弃物对环境、土壤的污染日趋严重,我国科技人员对可降解性地膜进行了开发和研制,目前降解地膜在我国部分地区已开始小面积示范推广。 1.降解地膜种类及特性 降解地膜依其组成成分和降解机制一般可分为光降解地膜、生物降解地膜、光-生物降解地膜三种。(1)光降解地膜。在太阳光照射下,经过限定时
Film-mulching cultivation technology has been introduced for demonstration and popularization and application for 23 years and covers an area of 150 million mu. In view of the increasingly serious environmental pollution and soil pollution caused by plastic wastes, Chinese scientists and technicians have carried out development and research on degradable mulch films. At present, mulching film has begun to be used in a small area in some areas in China. 1. Degradation of the type and characteristics of plastic film Degradation of plastic film according to its composition and degradation mechanism can be divided into general photodegradable plastic film, biodegradable plastic film, photo-biodegradable plastic film three. (1) photodegradation of the film. In the sunlight, after a limited time