据美国商业部谈,尽管美国脂松香生产近年处于严重衰退之中,从长远观点看,松香的来源仍需以脂松香解决。因为浸提松香的资源——松根已日趋枯竭;随着制浆技术的革新,阔叶材制浆不断增加,浮油松香生产的前景也不乐观;并且脂松香的某些性能又是其它两种松香不能比拟的。为此,美国商业部建议: 1.建立优质高产、便于机械化采脂的人工松林,解决松脂资源问题。如从现在起每年种植2,000公顷松林,到公元2000年就能有6万公顷这样的采脂基地。可作30年一循环的安 According to the U.S. Department of Commerce, although the production of U.S. gum rosin is in a serious recession in recent years, the source of rosin still needs to be solved with gum rosin in the long run. Because the extraction of rosin resources - pine roots have been depleted; with the innovation of pulping technology, increasing the pulping of hardwood, oil rosin production prospects are not optimistic; and some of the properties of gum rosin is the other two Rosin can not match. To this end, the United States Department of Commerce proposed: 1. To establish high-quality, high yield, easy to mechanize the artificial pine pine, solve the problem of rosin resources. For example, 2,000 hectares of pine forests will be planted each year from now on and 60,000 hectares of such bases will be collected by the year 2000. For 30 years a cycle of security