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我省自1972年以来在人工林中改建华北落叶松母树林24000余亩。十年当中,采种五次,平均两年一遇。据1975—1976年统计,两年采集球果45万斤,生产种子13500斤,如果全部用于生产,基础能满足省内造林应用良种的需要。为了提高选择育种效果,使科研为生产服务,我们结合大面积种子基地建设,在省属塞罕坝机械林场和龙头山林场迸行了定位试验和调查研究,现提出研究报告。
Since 1972, our province has rebuilt more than 24,000 mu of Larix principis-rupprechtii Forests in artificial forests. Ten years, the seed five times, an average of once every two years. According to the statistics from 1975 to 1976, 45,000 jin of cones were collected in two years and 13,500 jin of seeds were produced. If all are used for production, the foundation can meet the needs of the afforestation and application of good varieties in the province. In order to improve the effect of selective breeding and make scientific research serve production, we conducted positioning experiments and investigations on the construction of a large-scale seed base in the provincial Saihanba mechanical forest farm and the Longtoushan forest farm, and present the research report.