[Objective] This study aimed to solve the mulch plastic film pollution problems in Xinjiang, in order to provide reliable theoretical basis for the research on the degradation mechanism of biodegradable plastic films. [Method] The effect of illumination intensity on the decomposition of decomposable mulching films was investigated through simulating the field condition in laboratory. Regression analysis was employed to fit the processes of film decompositions. [Result] The weight loss ratios of different types of plastic films were closely related with the illumination. There was no sundry produced during the degradation process, but the weight was reduced, indicating that degradation produced gas, thus, ultraviolet rays had destructive effect on mulch plastic films. Different types of plastic films showed significant differences in the degradation speeds, and under the same conditions, the degradation speed of S4# with the induction period of 30 d was the fastest. With the extension of uv illumination time, the degradation became cumulative degradation process. [Conclusion] Under the uv rays, the weight loss ratio and illumination hours is regarded as a positive correlation relationship. The significant inspection shows that the data fitted degradation model can be described by the logistic model of Y = a/（1＋b×e -ct）, and all the parameters show significant differences （P0.01）.
Degradable plasticWeight lossUltraviolet radiationInduction periodDegradation model
温善菊、伍维模、魏建军、战勇、支金虎、彭杰、陈源
展开 >
塔里木大学植物科学学院,新疆阿拉尔843300
新疆农垦科学院作物所,新疆石河子832000
可降解地膜 失重率 紫外光照 诱导期 降解模型
National Key Technology R＆D ProgramFund for Postgraduate of Tarim University
NETL
NSTL
维普
万方数据
