“华北和日本落叶松种和种源研究”是“六五”、“七五”国家科技攻关专题,由中国林科院林业研究所主持,陕西、山西省林业科学研究所等17个单位参加。从1979年开始,共营造各类试验林200多hm~2。经过13a的多点试验和对早期引种落叶松的调查研究,取得了显著研究成果:①在我国第一次全面揭示了日本、 “North China and Japan larch species and provenances” is “Sixth Five-Year”, “Seventh Five-Year” national scientific and technological topics, hosted by the Chinese Academy of Forestry Institute of Forestry, Shaanxi, Shanxi Provincial Forestry Research Institute and other 17 units to participate . Since 1979, a total of more than 200 hm ~ 2 has been established for various experimental forests. After more than 13a experiments and the early introduction of the investigation of larch, and achieved significant research results: ① in our country for the first time a comprehensive disclosure of Japan,