林业上常说的适地适树就是实事求是,按自然规律植树。30多年来,我们走过了一条曲折的道路,有成功的,也有失败的。在河北省平原地区,五十年代到六十年代前期,大量引种加拿大杨、美白杨和唐柳,除了加拿大杨适生范围较大,在适生区生长快、材质较好外,美白杨和唐柳则表现了适生范围小,病虫害较多,不够速生等等,因而逐渐被淘 Forestry is often said to adapt to the tree is seeking truth from facts, planting trees according to the laws of nature. For over 30 years, we have come a tortuous path, successful and failed. In the plains of Hebei Province, from the 1950s to the early 1960s, the introduction of Canadian poplar, poplar and tamarisk in large quantities, except for the large suitable range of poplar in Canada, rapid growth in the suitable growing area and good material quality, Then showed a small range of suitable living, pests and diseases, not fast enough, etc., which gradually Amoy