一、国内外速生杨开发和加工利用概况 据联合国粮农组织1984年统计,全世界现有杨树人工林2000余万亩(不包括中国)。 世界杨树速生丰产用材林发展的趋势,大致可以分为三种类型,第一种类型是木材供应紧张,现正大力营造速生林,如南斯拉夫。第二种类型是想继续发展速生林,以减少木材的进口,但无适当的立地条件,影响其发 First, domestic and international poplar development and processing and utilization profile According to the UN Food and Agriculture Organization in 1984 statistics, the world’s existing 2000 million mu of poplar plantation (excluding China). The world poplar fast-growing high-yield timber forest development trend can be broadly divided into three types, the first type is timber supply is now vigorously to create a fast-growing forest, such as Yugoslavia. The second type is to continue the development of fast-growing forests to reduce the import of timber, but without proper site conditions affecting their development