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在我国北纬41°—44°,东经118°—119°范围内对7种落叶松进行了多年的种和种源选择试验,结果表明,适合当地生长的最好落叶松是当地种华北落叶松,其次是日本落叶轮、兴安落叶松;种源选择结果以丰宁、涿鹿、宽城、围场、沁源、关帝山、龙江等种源为好,可以用于生产。以上各优良种和种源均具有生长量大、造林保存率高等特点。如华北落叶松丰宁种源7年生林分比繁峙种源树高大54.2%,胸径大229.1%,保存率高18.1%。
Seven species of larch in China were tested for long-term species and provenances at 41 ° -44 ° N and 118 ° -119 ° E, and the results showed that the best larch suitable for local growth was native species Larix principis-rupprechtii Followed by Japanese impeller and Xing’an larch. The results of provenance selection are good for provenance in Fengning, Zhuolu, Kuancheng, Yantu, Qinyuan, Guandi Mountain and Longjiang, which can be used for production. All the above superior species and provenances have a large amount of growth, afforestation preservation rate characteristics. For example, the 7-year-old stands of Larix principis-rupprechtii in Fengning were 54.2% higher than that of the normal stands and the diameter at breast height was 229.1%. The preservation rate was 18.1%.