甘肃小陇山林区李子园林场的天然林,绝大部分是以栎类为主的阔叶杂木林,油松、华山松等针叶树零星散生,天然分布不多。为了改善林分组成,提高森林生产率,本场从1963年以来,先后引种了各种落叶松,共造林1.7万余亩,保存16,181.3亩,其中长白落叶松817.5亩。为了总结经验,选择、培育优良树种,我们对长白落叶松的生长和开花、结实情况进行了全面调查。现将调查情况报告如下: The natural forests of the plum garden in Xiaolongshan forest area of ​​Gansu Province are dominated by oaks, such as broad-leaved and mixed forest, Pinus tabulaeformis, Pinus armandii and other conifers, with few natural distributions. In order to improve the stand composition and improve forest productivity, the field has introduced a variety of larches since 1963, altogether more than 1.7 million mu of afforestation, preservation of 16,181.3 mu, of which 817.5 mu of Changbai larch. In order to sum up experience, select, cultivate fine tree species, we conducted a comprehensive survey of the growth and flowering and fruiting of Larix olgensis. The investigation report is as follows: