在林木苗圃中采用聚乙烯覆盖层现在已具有重大经济问题的意义,世界上许多国际的学者专家都在设法解决这个问题。与其他聚合材料和玻璃不同,聚乙烯薄膜质轻、价廉、紫外线和红外线极易透过,具有许多对植物有益的性能。全苏造林和林业机械化科学研究所伊凡捷夫苗圃在五年中进行了轻便的聚乙烯覆盖层下 The use of polyethylene overlay in tree nurseries is now of major economic importance, and many international experts and scholars around the world are trying to solve the problem. Unlike other polymeric materials and glass, polyethylene film is light, inexpensive, ultra-violet and infrared light-permeable, and has many plant-friendly properties. All-Su Afforestation and Forestry Mechanization Institute of Ivan Sewing Nursery in five years under a light polyethylene cover