甘蔗光降解地膜在湛江蔗区的增产效应及其降解效果

对甘蔗光降解地膜在湛江蔗区推广的增产效果及地膜残留状况等进行调查。结果表明：使用光降解地膜完全代替普通地膜，不会影响甘蔗苗期生长和产量；光降解地膜当年的残膜减少量在7．58％-16．77％；连续多年使用光降解地膜的蔗田地膜残留量明显低于普通地膜，且光降解地膜残留与盖膜次数呈显著负相关。在湛江冬春季，光降解地膜残膜露光1个月后就开始光降解,露光2个月后就基本破碎。

Effect of Photodegradable Plastics Film on Increasing Sugarcane Yield and Film Degradation in Zhanjiang Area

The effect of photodegradable plastics film （PPF） on increasing sugarcane yield increment and the film pollution was investigated in Zhanjiang area. The result showed that the PPF performed the same effect the common plastics film （CK） during the early period of cane growth and the cane yield. The weight loss of PPF was between 7.58%-16.77% after one crop of sugarcane. The study also indicated that the residual quantity of PPF in field soil was little than that of CK, and the PPF＇s residues has a significant negative relation with the time of the film use. The residual plastic film of PPF began photodegradation after exposed to sunlight for about one month and fell to pieces for more than two months in winter and spring.