【摘要】 研究表明,在不同年份、不同生态条件下,用聚氯乙烯(PVC)膜和聚乙烯(PE)膜覆盖农作物,两者增产效果一致;PVC膜的增产效应介于PE普膜和微膜之间,但差异甚微;增温保墒效应PVC膜略优于PE膜或一致;PVC膜的老化较PE膜快,但覆盖两个月内不发生老化;PVC膜中增塑剂DEHP可被土壤微生物降解,所以连续覆盖PVC膜不会造成土壤中DEHP积累性污染。更多还原

【Abstract】 Research indicates that when crops were mulched with polyvinyl chloride(PVC) film or polyethylene(PE) film at different years and ecological situations,the effect to improve yield of the both films are the same.In increasing production the effect of PVC film is between the PE film and microporous film,but the differences are slight.In increasing temperature and preserving the moisture of the soil the PVC film is slightly better than the PE film,or about the same.The PVC film is quicker than the PE film in senescence,however,in two months no senesce would happen.The DEHP in the PVC film were decomposed by microbes in soil,so successive mulching with PVC film doesn’t pollute the soil with the accumulation of the DEHP.更多还原