近年来,林业生产上开始试验和应用无色薄膜覆盖育苗,已取得了一些经验和效果。但覆盖无色膜后,圃地还有杂草生长,为找出能抑制杂草生长的地膜,1983年我所开始用黑色地膜进行杨树扦插育苗试验。1984年与市塑料研究所合作使试验趋于完善。两年来的试验证明,覆盖黑色薄膜能有效地抑制杂草、增加土壤的温湿度,促进苗木生长和提高苗木质量。 In recent years, forestry has begun to test and apply colorless film covering nursery, has made some experience and effectiveness. However, after covering the colorless film, weeds also grow in the garden. To find out the plastic film that can inhibit the growth of weeds, in 1983 I started to carry out poplar cuttage seedling experiment with black film. In 1984 with the Institute of plastic city so that trials tend to perfect. Two years of experiments have shown that coverage of black film can effectively inhibit weeds, increase soil temperature and humidity, promote seedling growth and improve seedling quality.