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对塞罕坝地区栽培的华北落叶松（简称华北）、日本落叶松（简称日本）、长白落叶松（简称长白）、兴安落叶松（简称兴安）４种落叶松的４８种交配组合１ａ生幼苗封顶进程调查发现：在华北×日本杂交组合中有希望选育出生长潜力大于华北的组合；在日本×华北杂交组合中有希望选育出抗寒潜力大于日本的组合；长白和兴安作父本对子代抗寒和生长潜力的改良作用相似；日本和华北作母本对子代抗寒和生长潜力的改良作用差异较大；同一树种自由授粉起源苗木的生长潜力大于自交所得苗木。
A total of 48 mating combinations of Larix principis-rupprechtii (referred to as North China), Japanese larch (referred to as Japan), Changbai larch (Changbai) and Xing’an larch (referred to as Xing’an) In the process of capping process, it is found that there is hope in the North China × Japan hybrid combination to breed a combination with greater potential for growth than in North China. In Japan × North China, there is hope to breed a combination with greater cold resistance potential than Japan. Changbai and Xing’an The improvement effect of cold resistance and growth potential of offsprings was similar to that of the offspring. The improvement effects of the female parent in Japan and North China on the cold resistance and growth potential of the offspring were quite different. The growth potential of free pollination origin seedlings of the same species was greater than that of the selfed seedlings.